New Savage 270 WSM. 300 rds new Rem brass. I'd like to jump right in and start looking for an accurate load, but there are two issues. One is that its usually though that barrels break in some and accuracy improves. I am considering doing some Tubb's Final Finish (abrasive bullets) to speed the break in up. But that's not the question of this thread. The question I have is -- will I get better results if I once fire my cases and then full lenght resize (or perhaps better still, just resize till they chamber and cycle reliably in my gun)? In other words, "set the neck back a few thou make it chamber nice". I think I know the answer and have pretty much answered my own question, but I'd like to hear it from others as well. I'm thinking some cheap bullets and powder and go shooting, loading up a 100 rounds, in various recipe's. Obviously the accuracy will be suboptimal, particularly since I'll be cleaning a lot at first in the breakin. If initial accuracy is pretty good with cheap stuff, perhaps I'll forget about the Tubbs and just move on to final load developement. Thoughts???