Just for general background, I am new, want to reload mostly for target, some for SD, and so far, none for match. The two calibers I am reloading at present are 9mm and .223 with .30-06 added in the future.
First, how much difference does minor length difference make? I have a box of 100 Winchester 9mm FMJ bullets. I sized them and grouped them last night. The lengths came out to three basic groups, 0.765, 0.768, and 0.772 for a max difference of about 0.012. Is this enough to matter for non-match loads? How would 0.01 length difference affect chamber pressure, velocity, etc., if I seat them all the same? What would be the max acceptable variation in length that you would tolerate before you treated them as separate loads?
And I have the same question regarding minor weight differences. What would be the max variation allowable for both a 115gr bullet in 9mm and a 62gr bullet in .223 you would accept before starting to consider then as separate loads?
First, how much difference does minor length difference make? I have a box of 100 Winchester 9mm FMJ bullets. I sized them and grouped them last night. The lengths came out to three basic groups, 0.765, 0.768, and 0.772 for a max difference of about 0.012. Is this enough to matter for non-match loads? How would 0.01 length difference affect chamber pressure, velocity, etc., if I seat them all the same? What would be the max acceptable variation in length that you would tolerate before you treated them as separate loads?
And I have the same question regarding minor weight differences. What would be the max variation allowable for both a 115gr bullet in 9mm and a 62gr bullet in .223 you would accept before starting to consider then as separate loads?