Re: Meplat trimming
Trimming meplats will reduce BC, the advantage is once they are trimmed they are theoretically more consistent. I trimmed meplats and actually saw a decrease in accuracy and never tried it again. I know people now that are trimming meplats and then repointing them with EXCELLENT results. It's time consuming and the pointing die is somewhat expensive. I'm not so sure it makes a noticeable difference at shorter distances though, out to 500. At a 1000 a friend of mine trims and points for benchrest, he is an exceptional shooter to begin with but seems to get great results. All that being said, trimming and pointing isn't the only thing he does so that may or may not be what seems to give him an advantage. Like mentioned, I wouldn't take the time for hunting.
Personally I think time is better spend sorting bullets by weight and bearing surface. and making sure everything else is as consistent as you can make it, case's, primers, exact powder measurements, seating depth, cleanliness and so on. That's all stuff you can do throughout the long cold winter months