07-10-2019, 06:34 PM
The main differences I've learned to look at between 18" and 20" Grendels is gas system length, not necessarily the barrel length in relation to performance (with a few exceptions, one being sea level 1000yd shooting).
Most of the 18" barrels on the market have MLGS, which if not ported properly, will gas the system too hard and cause malfunctions.
You can get ILGS and RLGS on 18" barrels from PF and Odin (ILGS), whereas JP has RLGS.
Longer gas systems will allow you as a hand loader to elongate the pressure curve with slower-burning powders and get faster speeds without hitting the gas port too hard.
If you are just starting with a barrel and know how to do an accuracy checklist build, I recommend PF. You'll get an actual Grendel SAAMI chamber for starters, not one of these conventional freebore chambers most of the manufacturers are skating by with.
Most of the 18" barrels on the market have MLGS, which if not ported properly, will gas the system too hard and cause malfunctions.
You can get ILGS and RLGS on 18" barrels from PF and Odin (ILGS), whereas JP has RLGS.
Longer gas systems will allow you as a hand loader to elongate the pressure curve with slower-burning powders and get faster speeds without hitting the gas port too hard.
If you are just starting with a barrel and know how to do an accuracy checklist build, I recommend PF. You'll get an actual Grendel SAAMI chamber for starters, not one of these conventional freebore chambers most of the manufacturers are skating by with.
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