Barrel break in is bs. I've never broken in a barrel, just go and shoot.

Ruger barrels are somewhat rough, but they do shoot. If you really want a squeeky clean barrel, heres how to go about it. Use your generic solvent to get out most of the carbon and other residue. Then run in Barnes CR-10 and let it sit 15 minutes. Patch out with your solvent, the patches will be blue. Then go at it with JB compound. Then use your solvent to patch out the JB, then apply CR-10 again. Keep alternating CR-10 and JB until no more blue patches.

Here's shots 11, 12 and 13 out of a ruger 350 rem mag. Shots 1-10 were factory fodder and "accuracy" was 3-4".

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Work up good handloads and only clean when the accuracy drops off. I've seldom seem accuracy drop signifigantly until I've fired hundreds of rounds.