The Firing Line Forums - View Single Post - Paper targets, same bullet, different holes.

**Unclenick** · December 4, 2009, 08:49 AM

I agree with Mongoose. Velocity difference due to different chamber and bore dimensions is most likely. Keyholing, if you have it, will be more apparent if you set up some 50 yard targets and look at the holes made from that distance. I suppose shallow rifling might have trouble with the polymer coating? Don't really know?

December 4, 2009, 08:49 AM	#3
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	I agree with Mongoose. Velocity difference due to different chamber and bore dimensions is most likely. Keyholing, if you have it, will be more apparent if you set up some 50 yard targets and look at the holes made from that distance. I suppose shallow rifling might have trouble with the polymer coating? Don't really know? __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle