Published 300 OSSM Load Data

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Published 300 OSSM Load Data

Postby Rattler » Wed Aug 17, 2011 1:16 pm

Long awaited, here's some independent load data for the 300 OSSM.
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Reloading The 300 OSSM.pdf
300 OSSM Load Data
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Re: Published 300 OSSM Load Data

Postby stdriver » Wed Aug 17, 2011 5:24 pm

Rattler: Thanks for the pdf file on reloading data for 300 OSSM. I for one will put it to good use in working future loads for the rifle
I have been watching posts from Hoot and Lilquiz and others, their range reports as well as my own range results although not as impressive as their's

All have been combined in a binder to further analyze. With luck and more range visits I might have a hunting load this deer season.

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Re: Published 300 OSSM Load Data

Postby Hoot » Thu Aug 18, 2011 3:10 pm

Some interesting recipes in there as well as a little education. I've always used Imperial resizing wax for that. I had no idea Weapon Shield lubricant was good for resizing. Not being familiar with it, I just assumed it was a light penetrating oil like FP-10 or Rem Oil. Also, it was nice to see some work with the Power Pro 2000MR powder.

I wonder why they couldn't get the lighter 140gr Monoflex bullets to run as fast as the 150gr Speers? Heck, even one of the Sierra 170gr loads went faster. I'd like to know as I just bought a box of each form factor. The ones with the shorter ogive and the ones with the longer ogive to see which ones run best in an upcoming range report. I was hoping they might go a little faster without sacrificing accuracy than the Speer 150gr bullets.

Where can I get an Olympic Arms Gamestalker magazine that fits 2.35 COL cartridges in it. The longest my Gamestalker magazine will hold are 2.29 COL.

Thanks for putting this up for us. I printed it and added it to my .300 OSSM workbook.

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Re: Published 300 OSSM Load Data

Postby Hoot » Thu Aug 18, 2011 5:01 pm

I forgot to mention that Midway still has the 30-30 version of the 140gr Monoflex bullets as blems on sale for $16.99/box. I bought a box of them and the .308 Marlin Express version a few weeks ago when they had their big blem sale. Looking at them, I can not see why they are called blems. Weights were very close as well. I plan on trying a few loads of 8208 and possibly AR-Comp with them.

While there are plenty of cup and core bullets with excellent track records for hunting, I am getting tired of spitting out bits of lead (the ones I find) from my venison. Who knows what percentage of the total lead in my venison those bits represent.

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Re: Published 300 OSSM Load Data

Postby Redneck Hapa » Fri Aug 19, 2011 3:43 pm

45 grains of Win 748 powder using 155 Berger bullets. The 4 shot group was fired from 100 yards. I am no expert marksman, and I am happy as a lark at the way my Oly shoots (or as my wife refers to it as "That Damn Gun"). :D
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Re: Published 300 OSSM Load Data

Postby Hoot » Fri Aug 19, 2011 4:30 pm

Redneck Hapa wrote:45 grains of Win 748 powder using 155 Berger bullets. The 4 shot group was fired from 100 yards. I am no expert marksman, and I am happy as a lark at the way my Oly shoots (or as my wife refers to it as "That Damn Gun"). :D


Wow! Nice group!

Berger makes like 6 or so 155gr 30 caliber bullets. Got a part number? I don't use ball powders. How fast did 45 grains of 748 push them? Was that one of several steps going up in charge? Looking at the .pdf file that Rattler linked, 50gr of 748 pushed that Nosler Partition to 2919fps. Compensating that to work in QL, looks like those 155s were going real close to 2600fps eh?

Gotta get me some, but trying to save some dough right now for a platform change.

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Re: Published 300 OSSM Load Data

Postby Redneck Hapa » Sat Aug 20, 2011 5:45 am

Thanks Hoot. The Oly will do the job, as long as do mine.
I am shooting Berger 155 gr VLD bullets. I don't have the velocity data as of yet, my dad and I are going to set up his chronograph to get some data. Note that I am using an AC4 pneumatic buffer. When I switched from the standard spring buffer, I noticed the pneumatic buffer is a bit stiffer than the spring buffer. More force against the bolt carrier meant less pressure released from the recoil. The increase in pressure was seen on the case faces and I had issues with jamming because the cases were expanding in the chamber. Hence, I had to back my charge off when I switched to the pneumatic buffer. I am lucky I did break as lug. Bottom line is if your using a standard spring the powder charge will be different than what I am have to use. I will let you know the velocity data when we are able to measure it. I will say this, my scope is a Burris ballistic-plex. I am zeroed at 100 yards, hitting dead nuts at 200 yards and 300 yards.
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Re: Published 300 OSSM Load Data

Postby Hoot » Sat Aug 20, 2011 6:30 am

Redneck Hapa wrote:Thanks Hoot. The Oly will do the job, as long as do mine.
I am shooting Berger 155 gr VLD bullets. I don't have the velocity data as of yet, my dad and I are going to set up his chronograph to get some data. Note that I am using an AC4 pneumatic buffer. When I switched from the standard spring buffer, I noticed the pneumatic buffer is a bit stiffer than the spring buffer. More force against the bolt carrier meant less pressure released from the recoil. The increase in pressure was seen on the case faces and I had issues with jamming because the cases were expanding in the chamber. Hence, I had to back my charge off when I switched to the pneumatic buffer. I am lucky I did break as lug. Bottom line is if your using a standard spring the powder charge will be different than what I am have to use. I will let you know the velocity data when we are able to measure it. I will say this, my scope is a Burris ballistic-plex. I am zeroed at 100 yards, hitting dead nuts at 200 yards and 300 yards.


Is that the Berger P/N 30408 or 30508?

Both are .308 155gr VLDs and I'm not including the 155.5gr VLDs. Why on earth do they make a bullet that is a half a grain heavier anyway?

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Re: Published 300 OSSM Load Data

Postby Globemaster » Sat Aug 20, 2011 7:04 am

Hoot wrote:Where can I get an Olympic Arms Gamestalker magazine that fits 2.35 COL cartridges in it. The longest my Gamestalker magazine will hold are 2.29 COL.

they must have used the UMAR-15 lower?
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Re: Published 300 OSSM Load Data

Postby Redneck Hapa » Sat Aug 20, 2011 7:11 am

Hoot,
The PN is : 30508. Yeah, I don't know why you would make a bullet .5 grains heavier.

Also, I did the mod. that you have done to shoot longer O.A.L loads. I am using a C.O.L of 2.400 like you, but using Winchester primers.
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Re: Published 300 OSSM Load Data

Postby Hoot » Sat Aug 20, 2011 8:19 pm

Redneck Hapa wrote:Hoot,
The PN is : 30508. Yeah, I don't know why you would make a bullet .5 grains heavier.

Also, I did the mod. that you have done to shoot longer O.A.L loads. I am using a C.O.L of 2.400 like you, but using Winchester primers.


I thought you might have mentioned that before Hapa, but I couldn't remember. Besides the 140gr Monoflex bullets, I also got some Hornady 180gr SPFB's to try. The results with the 180gr FB Noslers that Zooka sent me looked promising. I also got some 165gr DeepCurls to try, though they hopefully aren't as at odds with the caliber as the 165 HotCors. Seemed like I could not find a good load in terms of accuracy for them no matter what I did. Zooka warned me about them, but I had to see for myself. It doesn't make sense that a particular bullet will not find a happy load in a give caliber. I'm the eternal optimist, believing that every bullet can be made to shoot well in a caliber, if you find the load it likes. Since the HotCor 150s shoot so well, you'd think it wouldn't be such a stretch to get the 165s to do the same. I've yet to try anything in either a 170 or 175 either.

It's really starting to look like if you're chasing good groups, you almost have to be content with velocities in the .308 to low .30-06 range. Not that that's a bad thing. those calibers have taken plenty of deer. In that velocity range, there are plenty of accurate loads out there. I've been sifting through all my targets and have started my own little list of the loads that shot accurately, regardless of velocity. There are quite a few actually that shoot sub-MOA in my past efforts. They just didn't do so at really hot velocities. Which brings me to AR-Comp powder. It's like the perfect match for this caliber in terms of velocity versus pressure versus using all the case capacity, but for some reason, I've yet to find a consistently accurate load with it across several bullets that shoot accurately with other powders, even when I load them ahead of AR-Comp to match the velocity that they shoot accurate with in those other powders. To me that is perplexing. It'll be interesting to see what these 180s shoot accurately with. Ditto on the Deepcurls, though I suspect they will behave the same as the HotCors in the same weight. Some folks maintain that they are the same bullet, just renamed to spur new interest. With the Monoflex's, I don't know what to expect from them, though their form factor looks suspiciously a lot like those 160gr FTX's that I could not get to shoot accurately a while back. Lots of work to get done before the weather turns uncomfortable, especially considering that I'm still experimenting with two other calibers at the same time.
We almost finished rebuilding the rifle range superstructure today and should finish for sure tomorrow. That project cost me two weekend's worth of shooting and of course, both weekends had beautiful weather in the 70s. Go figure...

I did prep another bag of 25 WSSM brass to where they're ready for loading. So, the next few week's work will be with fresh brass. The last batch were starting to look the worse for wear and tear and every session yielded a split neck or two. Seems like 5 loadings are about the operational life limit for this caliber. I actually bought two bags of brass in a sense. Unlike the previous two bags, the one I got last week had like 12 bad cases, with folds and wrinkles in the necks especially, but many were in the area where the neck transitions to the shoulder. I actually took them back to my reloading store and despite the owner acting all put out about having to exchange them for another bag (from the same lot), that bag only had two bad ones. I could not believe what Winchester let get out of the factory. That's like one bad case in every four. Now perhaps I've lived a charmed life so far, but I've never seen such a bad effort from any manufacturer as those were. The reloading shop owner tried to get me to send them back to Winchester, claiming that they reimburse you handsomely for your trouble. I told him "That's why I pay you $38.00 a bag for what I can get cheaper by mail order. You send them back."

As always, I'll report my results. If you look at the activity on the WSSM Zone sub-forum, compared to more interesting ones like "What's your favorite Taco, Car, Band, Movie, Medieval Sword, Tacticool Sling, Cheese-Grater Forearm, etc. I swear there are but a few of us working to further the state of the art. That's a "lot of oyster and not enough pearl."

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Re: Published 300 OSSM Load Data

Postby Redneck Hapa » Tue Aug 23, 2011 7:53 pm

Here is a 3 shot group shot at 100 yards, using the Berger VLD 155 grain bullets. I kicked the load up to 45.5 grains of 748 (COL 2.40"), but I am going to have to back down again due to signs of high pressure on some of the case of the faces. Again I am no expert marksman, so this is pretty good shooting for me.
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Re: Published 300 OSSM Load Data

Postby Hoot » Wed Aug 24, 2011 2:20 am

Dayam! :thumbs up:

Have you checked the COL needed to engage the lands, with a Stoney Point or Hornady OAL Gauge? It would be interesting to know how far off the lands you are at 2.40COL.

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Re: Published 300 OSSM Load Data

Postby The Outlaw » Wed Aug 24, 2011 6:07 am

This here is The Outlaw. The Redneck is my Son. Hoot you can bet you will know OCL in a short Hornady insterment on the way from Midway. I been laying in the weeds letting you two do all the work. The least I can do is contribute a few sheckles to this cause. Much obliged to you all for the time and effort spent in this endevor. The Redneck has been my hunting pard from 3 years on went on his first deer hunt a 7. I never could get him into guns the way I have been all my life until now. I never saw him enjoy a gun the way he enjoys the Olympic 300. We talk about it everyday from the begining of the build until now. I've stayed out of the way and let him run with it. Hoot you have contributed to his knowledge base and to the drive to achieve what he has gleaned to this point. Much obliged to you for you time and effort. Redneck Hoppa you have put a smile on my face. A firearm is not just a tool but a work in progress. A piece of the puzzle in this hobby that has been my joy sence the age of 4 and receiving from my Uncle an Arisaka Rifle. I can never get enough reading, building and studying firearms. I am now 69 and I know that my collection is in safe hands. They are appreciated for what they are and not just $$ dollar signs. Everyone has it's own personality. Everyone a work in progress. You two make me smile It is a good day. Outlaw :thumbs up: :D :D
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Re: Published 300 OSSM Load Data

Postby Rattler » Wed Aug 24, 2011 8:13 am

^^RESPECT! :thumbs up: :thumbs up: ^^^
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Re: Published 300 OSSM Load Data

Postby shootermcmillan » Wed Aug 24, 2011 8:52 am

+1 :thumbs up:
Last edited by shootermcmillan on Wed Aug 24, 2011 4:29 pm, edited 1 time in total.
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Re: Published 300 OSSM Load Data

Postby Globemaster » Wed Aug 24, 2011 1:57 pm

well said Outlaw, welcome to OA2 ... we're glad to have you join us!
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Re: Published 300 OSSM Load Data

Postby The Outlaw » Thu Aug 25, 2011 5:56 am

Hornady COL gage, taps on the way. Shucks we can make all our own cartridges to use with the COL. Thanks to all of you on here for the information and the come back. I read all the time but I don't post much. Happa and I are going to try the 300 OSSM out on Antelope here in Colorado in about a month. I have always been an overkill guy. I've killed Antelope with a 416 Rem. Mag. and 30-378 Weatherby. Redneck Happa throws a fit when I do that. Truth is they don't destroy the way you think they would if you place the shot. I think I am going to like this cartridge alot. Shoots flat and accurate. Antelope are sometimes so skidish that you take what you can get as far as range. I am looking forward to this hunt. Wide open country. not much cover, hard to work up a stalk and stay out of sight. I like it alot. Redneck and I have had more success on Antelope than anything. I tell him I'll hunt tell I'm 70 and anything past that is icing on the cake. I'll be 70 in May and I got to admit chief cook and bottel washer ain't looking all that bad. I feel good and I still work a 10 to 12 hour day fulltime. I retired 9 years ago but I can't stay home. I like being out and about. I deliver to nursing homes and hospice paitents. I got a song from Wellie that goes with the job
"On the road again, I just can't wait to get on the road again
The life I love's delivering medicine to my friends
and I can't wait to get on the road again."
You all have a good day and thank for all the information on this sight.
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Re: Published 300 OSSM Load Data

Postby 40 rod » Sat Jul 14, 2012 4:40 pm

I am pleased to find one of the published loads almost identical to the one I have worked up for my .300 ossm
gamestalker. The listed load is 48gr of xbr8280 pushing a barnes 130gr TSX with a COL of 2.32. my load is 49gr and a COL of 2.395. ( I have a UMAR lower ) accuracy is maybe borderline outstanding, Yesterday I fired 2 groups 5rds each at 200 meters ( 200m=220y= 40 rods) the first group was carefully fired from the sandbagged bench and strung in a vertical pattern 8" x2" . the next group was fired under identical conditions except I waited 120 seconds after each shot ( plus another 15 or 20 seconds to aim and squeeze . this time I got a nice pattern that fit in a 3 1/2 inch circle ( 1.6 MOA)

So it looks to me that my POI shifts upward as the barrel heats up. any how I think this is the load i will be using this season.



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