I finally got a chance to test some of this new powder this weekend. I loaded up a few and tried them in my .308 with a 20" barrel I got around 2800 fps on a 40*F day. This powder is very consistent, I didn't chrono all the loads but the ones I did check were 2808, 2802, 2807, 2802, 2805. Here is the load receipe, winchester brass, cci 200 primers, Hornady 155 Amax loaded to 2.800 OAL with 45.0 gr of IMR 8208. The 5 shot group was .926@100yds. It should have been .461 but I had 1 flyer, probably my fault. I was standing in the back of a polaris ranger using the roof for a shooting table. It was really muddy on my range here lately. I think this powder shows some really good potential. I usually get around 2730fps with Varget or R15. This stuff is a faster and just as accurate. I should be able to get it faster and maybe tighten up the group too. I just picked a charge weight and decided to try it.
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IMR 8208 test results
- Thread starter badshooter
- Start date
Re: IMR 8208 test results
Compressed Really? Are you using a drop tube? I'll have to check this out.
I use XBR for 6.5 Grendel with 100gr Scenars and 30.5gr in those small cases aren't even compressed - although getting close.
Compressed Really? Are you using a drop tube? I'll have to check this out.
I use XBR for 6.5 Grendel with 100gr Scenars and 30.5gr in those small cases aren't even compressed - although getting close.
Re: IMR 8208 test results
No drop tube, just dump it through the funnel. Its not compressed, but I can only hear a few kernels shaking around. No scientific testing on that part.
No drop tube, just dump it through the funnel. Its not compressed, but I can only hear a few kernels shaking around. No scientific testing on that part.
Re: IMR 8208 test results
Shot SRS .308 1/10 Krieger 22" barrel used IMR 8208 xbr Lapua case 155 L 2929 Fps load in single digits SD ES ( below ability of chrono to measure)but shows cosistancy. Four loads same POI in OCW test with in 1/4" of each other at 100 yds largest 3 shot .5 Moa others .3 Moa. confirmed at 300 one round each under 3/4"
I run my AIAW at 2940 Fps with 25" barrel so I gave up 20 Fps, big deal. No preasure signs, primer edges round not flat, no leaks around primer and easy bolt lift/extraction. Worked up the load OCW bullet loaded out to -.010 jump ogive length 2.227 OAL 2.851, its over the published max 45.3 but note the OAL they list.
Shot 60 plus rounds 1000 yds Temp about 50F Alt sea level 10 mph cross wind at 90 degrees all sonic. First relay 187- 2x F class target 10 ring 10". Next relay I screwed up but it was not the rifle or the load, operator.
Shot SRS .308 1/10 Krieger 22" barrel used IMR 8208 xbr Lapua case 155 L 2929 Fps load in single digits SD ES ( below ability of chrono to measure)but shows cosistancy. Four loads same POI in OCW test with in 1/4" of each other at 100 yds largest 3 shot .5 Moa others .3 Moa. confirmed at 300 one round each under 3/4"
I run my AIAW at 2940 Fps with 25" barrel so I gave up 20 Fps, big deal. No preasure signs, primer edges round not flat, no leaks around primer and easy bolt lift/extraction. Worked up the load OCW bullet loaded out to -.010 jump ogive length 2.227 OAL 2.851, its over the published max 45.3 but note the OAL they list.
Shot 60 plus rounds 1000 yds Temp about 50F Alt sea level 10 mph cross wind at 90 degrees all sonic. First relay 187- 2x F class target 10 ring 10". Next relay I screwed up but it was not the rifle or the load, operator.
Re: IMR 8208 test results
I'm trying to get a bunch of stuff done right now. I've got some 8208, just not enought time to shoot it! I might just try some of the loads in the hodgdon manual per the article in the front. In all their testing, they used loads that were exactly 1/2 gr. below max.
I'm trying to get a bunch of stuff done right now. I've got some 8208, just not enought time to shoot it! I might just try some of the loads in the hodgdon manual per the article in the front. In all their testing, they used loads that were exactly 1/2 gr. below max.
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