Re: SD and ES; what is considered good?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jlow</div><div class="ubbcode-body">It’s not a question of getting one’s “panties in a wad”, it is simply trying to understand the limits of what is possible. This is an important part of learning anything including reloading. If we don’t ask and challenge, we will never benefit from someone else’s leanings.
I think a SD of 10 is a lofty goal but potentially doable, but an SD of 3 from a 10 shot group (done consistently) seems hard to believe (not saying it cannot be done, just hard to believe). For example, an ES of 6 from the same quote say from an MV of 2500 ft/sec means that <span style="font-weight: bold">NONE </span>of the rounds deviated more than 0.24%! Now I can certainly weigh powder that accurately with my electronic scale, but to have a sum deviation from <span style="font-weight: bold">ALL </span>the components involved in my reloading to not deviate by that much would be daunting. Not saying it cannot be done, just daunting and takes more than just your everyday precision reloading practice.
The fact is any one of us that states on any board numbers that are that good is going to get challenged. It does not mean that it did not happen; you just have to be able to come up with something equally convincing to justify the numbers.
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If you individually weigh sorted cases, and then further into internal case volume, used the right primers, sat smack bang in the middle of a node, measured powder charges out with kernal accuracy, weight sorted projectiles and also further sorted into bearing surface length... Then yes its actually easily possible.
