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Join the contest SubscribeDepends on the use.So what is the "acceptable SD" on most .5 MOA guns??
A 1 moa rifle with an SD of about 10 will do quite well at 1000 yards.So my SD's didn't change much. I'm going to try a couple different primers. I'm beginning to shoot at longer ranges (out to 1K). I'm making hits but as my skill level progresses I want to make sure I'm not being handicapped by my equipment. Any other suggestions?
The rifle in question consistently shoots 1/2 and better MOA out to 300 with this load and an SD of 12.
10-15 or better.So what is the "acceptable SD" on most .5 MOA guns??
That's funny! BR2's lowered my velocity by 10-15, and narrowed my SD by 3-4 fps in my pet load compared to 210M primers.So I was at the range today. Had my pet load for the CTR but loaded with different primers. Shot them at 200yds. One of the primers, CCI BR-2, gave me an avg of 15 fps more and lowered my SD to 10 over 20 shots. My 4 group averaged 1.15 inch. Very pleased with both my set ups now. Time to stop playing and start shooting.
Or build another one?
Great read!!10-15 or better.
Read this article because it has a lot of info and will answer your question regarding what level of precision SD plays in hit probability.
Exactly. I was chasing the SD and velocity dragon for a long time. I have since stopped doing that bullshit because realized I'm not a benchrest shooter. As long as things are sub 3/4 MOA and under 15 SD for a 10 shot string, I'm loading a shit ton and focusing on my shooting skills.Just read the article. It does put it into perspective for me. Helps me arrive at the conclusion that I'm happy with my results and don't need to go any further for my typical shooting.
Exactly. I was chasing the SD and velocity dragon for a long time. I have since stopped doing that bullshit because realized I'm not a benchrest shooter. As long as things are sub 3/4 MOA and under 15 SD for a 10 shot string, I'm loading a shit ton and focusing on my shooting skills.
Correct. ES of 35 and under, and your doing well.I agree and a tight sd is nice but guys get so focused on a SD of 3 that they never run the numbers between a 50fps velocity swing at 1500 yards... That one or two outlier may not be enough to blow up your sd for 10 shots but a .6 mil drop change from shot to shot is a no go chief. I focus more on my es being under 35 fps consistently at a given da and temp.
If it's getting you pulling your hair you really need to read Bramwell's paper.Thanks everybody. I needed to have this put into perspective. The rifle in question consistently shoots 1/2 and better MOA out to 300 with this load and an SD of 12. That's as far as my local range goes. I only get to shoot to 1K about 4-6 times per year. So, given what Steelhead said, I'll give different primers a try. If it works good but if not I think I should leave it be unless I find a place to shoot past 1K. This was and expensive rifle for me and I don't want to burn up a barrel chasing numbers when I can be enjoying shooting the damn thing. This shit can drive you nuts!
So, I just googled that paper, and it really fell apart in the first page were he says that small data sets can reliably convert ES to SD based on simply multiplying a coefficient. He uses dataset examples consisting of 2 to 7 data points.Read The Perverse Nature of Standard Deviation by Denton Bramwell. It's a short paper on Standard deviation that every reloader should read.
So what is the "acceptable SD" on most .5 MOA guns??