6mm Creedmoor

So I finally was able to get the second rifle, the Stiller Tac 30 with the Benchmark barrel, out for testing. Shot 3 different seating depths, 2 sets of 5 round groups. Results look promising, with a little fine tuning to do.

I was running the 105 gr Berger Hybrid over 42.1 gr of H4350 with Federal GM210 Match primers in necked down new 6.5 Creedmoor cases.



Paul did an excellent job on the gun. Looks very sharp as well as a good shooter. Rounds are feeding well from the magazine and recoil is minimal due to the cartridge and the very effective comp. If you want to see more beauty shots of this rifle and the sister, you can see them on reddnobb.com



I'll post some 200 and 300 yard test targets when I get a chance, but I'm very happy at this point.
 
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I got to play a bit more with the caliber over the last couple of weeks, here's what I found out.

Velocitie tests with my rifle using the 42.5 gr. load, chrono is a Magneto-speed gen 1.

10 rounds loaded with new brass gave an average of 3137 fps and an SD of 16.
5 rounds loaded with 1 fired brass but with die setting mishaps gave and average of 3134 and an SD of 19. 5 rounds loaded with 1 fired brass and properly set dies gave an average of 3140 fps and an SD of 5.

For medium range stuff. I took it out for a woodchuck hunt but since the woodchuck weren't cooperating, out came the steel plates. No grouping was done, we just had plain fun with the thing. Shooting in a 10-15 km variable wind from 3:00 from 375 to 675 meters. At 675 the hold was 4 mills and holding 0.5 for wind would get you on the 16 inches round gong 75 % of the shots without worrying about the wind. Most misses we due to underestimating the calibers performance in the wind, it's just a laser at those distances.

The second test was this week end when Johnny and I drove to the Valcartier shooting range and shot an F-class innitiation day shoot. A first try at this type of shooting for both of us. Ranges were 300, 400, 500, and 600. Wind was non existant for most of the day and once again the 4's were due to underestimating the caliber whenever a breeze showed up otherwise the caliber had no problem holding the 0.5 MOA center at 600 yds. Funny thing is that it took us until we got to 600 yds to finally understand the bullet trail, we were looking too high being used to 308 ballistics, at 600 yds the trail would barelly rise above the black part of the target. At closer ranges it's mostly hidden by the bulllseye and has no curve at all.

Johnny's rifle was shooting a bit high on our 600 yds target and I had read that we could expect a velocity increase once the barrel hit the 125-150 rds mark. After the match we went back to the shop to chrono some of his rounds. When I chronoed the barrel at first, 42.1 gr. of H4350 had given me a speed of 3097 fps. A 5 rounds average out of his rifle was now 3169 fps with a SD of 11 using new brass, some of it could be due to the different primer that he uses but otherwise the loads were the same.

I'm totally happy with how this caliber has performed so far and after those two test, I has become clear that this caliber need a lot more distance and wind than I had to be properly put to the test.

P.
 
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