When cases are within .005" of one another, you will not get any discernable increase in accuracy, unless you are shooting a sub-MOA gun. With variances in the .01 range, I'd trim them, just to get everything uniform for that batch, as they age. If you are crimping necks, that is another reason to trim as uniformly as you can.
My experience shows that cutting the last .005" will increase repeatability by about a tenth MOA. That was on two rifles over about 1000 rounds fired each rifle using 100 cases each (50 trimmed, 50 untrimmed.) Didn't increase my scores at all. Shooting grapefruit at 1K yards, the fruits didn't care.
Last edited by armedandsafe; 09-24-2003 at 02:03 PM..