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Any do's and dont's when breaking in a new Grendel?
#2
The point of breaking in a barrel is to essentially polish out any machining marks left in the throat/bore. The old shoot/clean/shoot/clean/etc practice is aimed at making sure that the inconsistencies get fire lapped away rather than just filled in with copper.

A break in procedure isn’t going to make or break a barrel. It can potentially help by smoothing out the throat. If you bought a high-end hand-lapped barrel I wouldn’t worry about it. If you bought something else you may benefit from it or may not. The break-in cadence you use is less important than being aware of what the goal is: remove copper and fire-lap machining marks. It’s not going to turn a 1.5” barrel into a 0.5” barrel, but it may turn it into a 1.0”-1.2” barrel.
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Any do's and dont's when breaking in a new Grendel? - by snarkscarbine - 01-10-2019, 02:05 PM

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