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Old December 27, 2012, 04:14 PM   #21
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,727
Shredder, that's right on large vs. small groups. The proof is firing 20, 30 or even 40 shot test groups. Note also that if a given load doesn't produce the same size groups all the time (within 10% extreme spread), you're not shooting enough shots per group to make them at least 90% represent the real accuracy of your stuff as you shoot it.

Your bullet's seated out too far when:

* the round won't fit in and load reliably from the magazine.

* bolt won't close easily on the round as it jambs into the rifling.

* it's not held good enough by the case neck to withstand normal handling and works loose from being seated to shallow.
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