08-02-2018, 03:08 AM
The problem is if you let a cartridge with really sharp, secant ogive bullets feed too low through the feed ramps, the meplat of the bullet hits the breech and not the chamfer or chamber.
With the big fat bores, not a problem, and some have even eliminated the center lug of the extension to accommodate their massive frontal area and path to the chamber.
With Grendel, you want as much lift as you can get into presentation without the ogive riding in too low.
This also drives the dimensions of feed ramps, and upper-to-lower receiver fit.
With the big fat bores, not a problem, and some have even eliminated the center lug of the extension to accommodate their massive frontal area and path to the chamber.
With Grendel, you want as much lift as you can get into presentation without the ogive riding in too low.
This also drives the dimensions of feed ramps, and upper-to-lower receiver fit.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com