It's very simple don't drive yourself crazy and don't reinvent the wheel. What's the biggest game you going to hunt with that rifle? If you say elk and you choose for instance a 225 partition, or whatever. work up a good load make sure accuracy is there and use that bullet for everything from...
I had Harry (the original owner) re-barrel a couple of guns in the 1990's. Great stuff and no issues. They were in Illinois at the time now in Montana I think.
Posting for a good friend and neighbor.
Like new in box. Fired about 50 rounds, one time at the range and put away. This is in 9mm.
Asking $525 Shipped to your FFL.
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As far as powder lot goes, I do try to buy a 5 pounder (or whatever is offered by the manufacturer). If only one pounders are available then I buy a few and if they do have different lot #'s I mix them together in a big canister and make my own blend and adjusting the load.