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Couple of things....I seem to remember someone saying something about a H4895 load making you smile Concerning adjusting the gas block. I like the instructions that came with my Superlative Arms adjustable block. I'll paraphrase them here Load one round in a mag. Fire, if bolt locks back, close block 1 click. Repeat until you get to the first failure to lock back. Then open it 2 (yes TWO) clicks and call it good for that load
A couple of days ago I loaded some test loads for the 308. After getting some advice in my thread about gas gun loads and consulting my Hornady manual, I came up with 40.5, 41, 41.5 and 42 grains of H4895. I got out this morning before the heat got too bad and tried them. The gun did ok with the 40.5 grain loads. The hole to the left was my third and I felt like I pulled it just a touch before I saw it on the board I think that one could have been a little better. I didn’t take my caliper with me, but comparing it to the 1” paster, it looks to me like it’s pretty close to 1” even with the flier.The next two loads opened up pretty dramatically. I won’t even bother posting pics. 2”+ groups. It definitely didn’t like those loads. I had a feeling it would find another accurate spot somewhere higher and was hoping the 42 grain load would be it. I wasn’t disappointed. I cut that section of the target backer out and out and took it home to measure it. .49” center to center. Thats at 2.175” BTO length. I’ll take that. Now, I need to load up the rest of my brass with that load and check velocity next time out. Then I can get my initial ranges on the BDC reticle marks and verify them.
Hopefully, the reticle is not to thick to make shooting your target at 400+ yards a trying task.
I have a theory about load development. Have you ever noticed most “ best” loads are at the higher end? We get more used to shooting the rifle and when we get to the top end we have “got it”. Great fourth group by the way!
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You built yourself a keeper
Sounds like that procedure should work on mine. Although, all of the test loads I tried today pretty much landed in about an 8” circle at my 4 o’clock, a few feet away. That’s with the gas block almost half open and not a single malfunction so far. Once I get an allen wrench long enough to reach the gas block, I might try closing it down a click at a time as your instructions state.
Killed a pig with mine tonight.
220yrds w/ Sierra HPBT-GK
My pig wasn’t nearly as big and was funny looking... And it wasn’t edible.
temp- 80 degrees
ballistic coefficient- .475
50 yard zero
3” sight over bore
The Vortex ballistic reticle look so like this, with the MOA noted for each mark.
Based on the ballistic calculator info and those MOA measurements on the scope, it gives me the following.
Main reticle- 20-220 yards (+/- ~1.5”)
2.4 MOA mark - 280 yards
5.6 MOA - 375 yards
9.5 MOA - 480 yards
14.6 MOA - 595 yards
Whether or not that is correct, I’ll have to find out. Next trip out, I’ll check and verify and adjust as needed.
300-600 yards should really start getting interesting.
Alcohol, Tobacco, Firearms and Explosives.... now who's bringing the hot wings? :jester: