#85 - AP CH5: Inherent Precision
00:53:57 | Accuracy and Precision Chapter 5 covers the most often asked topic in precision shooting: How much will smaller groups at 100yds correlate to better hit percentage at long range? Many shooters chase smaller groups without examining at the effect it has downrange to hit various targets. Two better questions would be: Under what situations will improving precision be beneficial? When is a small group good enough? Bryan and Francis cover the details of using AB Analytics software to answer this question in a variety of situations from competition to hunting.
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The Applied Ballistics Analytics Package is the ultimate desktop Ballistics program. Using the Applied Ballistics solver, you can calculate ballistics based on G1 or G7 referenced BC’s as well as the full library of Applied Ballistics custom drag models. The state of the art solver combined with laboratory measured drag data makes this the best and most complete solver on the market. The WEZ tool referenced in this episode is a key feature, allowing you to calculate which variables are having the most (and least) effect on your accuracy down range.
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Hi
I’ve been thinking about how does precision and muzzle velocity statistical indicators relate , is rifle precision based on SDs and the vertical spread based on that , and what dictates your distribution on target at distance, MV or Precision?
I am currently preparing to shoot PRS Rimfire. I’m reading this book and watching the accompanying videos for each chapter. This information is highly applicable for centerfire rifles and I understand this fact. My question is; will all of this apply to rimfire? If so, how much or am I chasing a ghost? Thanks guys I appreciate any input you can provide.
Rimfire is inherently sensitive to muzzle velocity, much more so than centerfire. Rimfire has lower (worse) inherent precision due to a multitude of factors beyond the shooters control: projectile consistency, environmental consistency and relatively high SD’s in terms of percent of MV just to name a few. Muzzle Velocity SD’s for centerfire and rimfire are about the same (7-12fps for an average rifle/ammo combo), however, a subsonic platform will experience more sensitivity to MV shot-to-shot due to the way drag works in supersonic flight vs subsonic flight. This affects inherent precision at short range and severely impacts accuracy and precision at long range.
For rimfire, my focus would be on large sample sizes for zero (average center of multiple 5 shot groups to determine true zero location), and muzzle velocity averages over 15-25+ shots to get solid working range. In practical terms, focusing on solid positions, perfect NPA, follow through, wind calling and tracking the average POI at various ranges throughout a match will provide the most impact on consistency in PRS rimfire scenarios. You will increase your hit ratio more through focusing on those areas than by purely focusing on precision mainly because much of the precision is due to factors outside your control.
-Francis
For rifle precision in WEZ analysis, are the high, medium & low MOA values intended as mean radius or extreme spread (CTC)?
Extreme spread, and obviously not just one group. Theoretically, if you fired a 25 or even 100 round group, the extreme spread of that group would be a good representation of that input into WEZ.