My advice is that barrel is safe as long as you accept that you will need to load 0.5 grain less than recommended loads for SAAMI chambers. Also, don't fire any factory ammunition through it. Factory ammo might go into battery but the load is designed for SAAMI chambers so will be (dangerously) hot in your chamber.
I agree with the others that it is prudent to finish ream or swap out barrels, preferably take it back for a refund if you can. If you are stuck with it and don't want to hand ream it you can still use it safely, but hand-loads only and work up stopping at 0.5grains less than everyone else.
NB: The 0.5 grain difference is from crunching the numbers on Quickload. QL is a computer simulation so bear in mind that in reality it will likely be more or less. Your risk but if I were you I'd not take the risk and fix it.
I agree with the others that it is prudent to finish ream or swap out barrels, preferably take it back for a refund if you can. If you are stuck with it and don't want to hand ream it you can still use it safely, but hand-loads only and work up stopping at 0.5grains less than everyone else.
NB: The 0.5 grain difference is from crunching the numbers on Quickload. QL is a computer simulation so bear in mind that in reality it will likely be more or less. Your risk but if I were you I'd not take the risk and fix it.
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