6.5 Grendel PTG Reamer

[NugginFutz]

Great info, that is what I was looking for. I'm seeing the same thing but wanted another person to post there findings. If people would do the same measuring before and after, we might just determine it is a brake in process needed for a Grendel Chamber that is not hand lapped. Yes other calibers might not need this due to there throat geometry but this is a Grendel and it is unique.

Tedward,

I would like to clarify the point you're making, in that last comment. Not every Grendel chamber needs to be hand lapped - far from it. The sample of barrels with this issue is quite small, considering how many Grendels are out there. It is not a function of the chamber design, but rather a function of how a particular reamer was designed.

So, when you say "other calibers may not need (lapping)" because their throat geometry is different than the Grendel's, the implication is that a Grendel would need lapping. This is simply not the case. I am sure you did not mean to imply that all Grendels need to be lapped, and wanted to make certain that point is clear.