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Old December 2, 2021, 08:24 PM   #8
RC20
Senior Member
 
Join Date: April 10, 2008
Location: Alaska
Posts: 6,892
It would be a help to start with to list the caliber and the gun its going into.

That said, the cannelure is factory safe for any firearm (length wise fitting magazine and the chamber).

You can measure the real engagement into the lands a number of ways and usually (maybe always) you will fine the cannelure is above the mouth.

Pure accuracy types (target shooters) like to play with that to get best groups.

Hunting gun (aka Acubond) you can go with the book COAL or the cannelure. I played with it when I was hunting, didn't make any difference in my gun and eventually I used factory (ran out of reloads, going hunting, panic, forget it).
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