First off, I'm a novice or less when it comes to reloading or accuracy, so I'm just the messenger here, reporting the results that I got. Target was 100 yds out.
When I first shot my accurized .270 WSM Winchester, I knew it was a lot different/better. My break-in was to shoot 15 rds of factory ammo, cooling and cleaning the barrel after every 5 rds. Then shoot 4 different reloads, cooling/cleaning the barrel after 5 rds. The 1st round being a fouling round, plus 4 more for each powder type. All reloads carried a 130 gr Nozzler accubond bullet.
The first 5 reloads had 63 gr of RL22. The fouling shot is the right one.
The next 5 rds had 64 gr of RL 19. The fouling shot is on the upper right.
The next 5 rds had 64 gr of IMR 7828. The fouling shot is-you guessed it-the upper right one.
The last 5 rds had 61 gr of IMR 4350. Yep, the fouling round was high right.
So the main thing I was sure of after all that was, MAN my shoulder hurts! Plus I was ready to go home, have a beer and watch the Cardinals game. As far as which reloads to go with, I think the IMR 7828 has the best grouping.
After I get more reloads, I'll have to go out and do the final sight in. This rifle is the one I'll use on my Mexico coues hunt after Christmas.
Good luck to all you late hunt tag holders!