Breaking in a new barrel

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Originally Posted by Kenebene1

I dont believe any decent barrel these days needs breaking in. One thing I definitely am convinced of in MV migration. Getting a mv change usually after a couple of hundred rounds through the barrel. We tested 6 mrad 338lm and they all did almost the same thing. The mv jumped up about 100 ft at about 300 rounds. Some slightly more.

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Would have been interesting to note the pressure signs, before and after the 300 rounds- primers etc

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Originally Posted by foxhound

Brand new walther barrel installed on my 8mm yugo M48, just shot 5 round groups while sighting it in quick clean with ballistol and dry and continue for 20 rounds. Once i got home carbon cleaner and then copper remover. Have fired about 60 rounds in it so far and groups great and will just leave a small amount of copper in the bore, once copper builds up to much i will remove that. I think its more important to use a carbon only remover after shooting and a bit of copper in there is fine. I use the KG1 products from reloaders.

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I was trying to give a young, new Hunter, similar advice to yours, with his new .270 T3, yesterday. He wouldnt have a bar of it, said everything he'd read showed a dry patch was fine...and thats all he used for cleaning-out the oil before firing as well !