26" McGowen barreled 6mm Grendel upper

[Sticks]

Looking back at your post about buying that barrel from McGowen I ordered mine a week or so before. I think it is a bit difficult to figure out when the bullet is touching the lands with your method of seeing when it gets stuck. Using the Sinclair gauge or the Hornady LNL OAL Gauge is way more accurate....

I found that LNL gauge to be inaccurate. The modified case is SAAMI spec case length of 1.510. My resized cases for the AR is 1.515, fired case length between 2 of my ARs is 1.518 to 1.525 (not exactly sure where the chamber measures out).

Anyhow - I was getting bad intel from the tool. I could not find the math to do the conversion from bolt face to lands, so I also use a sized case with a slightly crimped neck to chamber with a seated bullet and remove to get measurements. Rinse and repeat several times until I get 3 matching measurements and give myself .005 fluff room.

Hornady LNL curved tool and modified case for sale!

p.s - Send me your 105 RDFs if you are donating to the landfill. I may start chasing lighter faster for my shooting matches.