Well actually as far as efficent shooting goes theres other things that enter into it to like the amount of powder you can burn before you completely lose accuracy. the speed of twist in relation to the length of bullet [look up Greenhil formula] and blowing the patch or sabot and barrel harmonics.
I have been present when one of these people who wont listen blew a nipple on the range and believe me it was not pleasent, I was also present when a new guy split the barrel on a CVA [I think that has prejudice me ] so take us serious when we try to keep you from being another statistic. Lee