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I know that the black powder cartridge shooters do that, and even index the bullets into the gun according to the spru mark from the molds they use. Also, the 1000 yard guys do it. I think it is one of many things you can do that isn't really effective in a hunting load. But, add enough of these small tweaks together, and you have a noticeable improvement. In my hunting guns, I got the most noticeable effect by moving my bullet out closer to the rifling. This is limited by the length of your magazine though. My .264 rounds have about a sixteenth of an inch between the cannelure, and the rim. This makes the cannelure useless, and makes a funny looking round, but it has helped me group better. Particularly with cheaper bullets. I have rifle rounds that I load from a charge bar, with no special effort except to make sure the length is right. I also have some that I have reamed all the pockets, turned the necks, trimmed, electronic scale, check runout, seat bullet out to within .0020' of the rifling, etc. No one thing seems to do much, but if you are particular all the way through, it seems to be worth it, especially at longer range. I would also say that buying good brass, and using the same brass all the time is a must. (Mixing brass can be a real disaster.) I like to use Norma brass, or Lapua. Norma also manufactures Weatherby brass and it is good stuff. Good luck
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