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Insert a X54 cartridge in front and if it goes in up to case neck it counterbored!
Shine a borelight in front and if the front of barrel is round then its C-bored.
Take a cigarette and insert in muzzle and if it gets hung aftre 1- 3 inches it is C-bored!

This was done on many guns since they crown was damaged from rough cleaning rod use,so it improves accuracy.
In general a C-bore is 1 1/4 -3 in long!
A few peolple dont like C-bored guns, but many were done and i rather have 1 C-bored than not and have a bad muzzle!
Might drop price of gun by $10. at best!
 
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