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AR15.COM
11/29/2011 11:26:26 AM EDT
Anybody have a borescope in Dallas?  

I have a rifle that is key holing two different weight bullets, 69gr and 75gr.  It is not key holing bullets that weigh less or more though.  The manufacturer of the ammo is very accommodating, but they would still ask that I bore scope the rifle.
11/29/2011 4:25:12 PM EDT
[#1]
which rifle?

whose barrel?

which twist rate?

round count?

have you ever measured the leade as a baseline to keep on top of throat erosion?