GBS 52 If i chambered the barrel,My info will be on the Barrel,I do not have a clue as to who you really are,I prefer real names instead of handles,You then know a little more of where someone is coming from.I will bet that i did not put the barrel on for you,because if i did,you would already know the answer to your question. I have over 30 different reamers,& i chamber a barrel for the ammo that the customer will be using,You need to contact whoever you bought the rifle from & see what they had it chambered for,Its not going to perorm up to its best ,if you are shooting the wrong ammo,Every barrel that i put on is chambered for certain Make & lot of ammo. Hope this helps. BILL