6.5 Grendel Barrel Length Comparison

[LRRPF52]

Good Stuff! Would love the see what you come up with shooting 129gr interlocks.

12” Grendel 129gr Hornady Interlock SP (G1 BC .445), 2182-2294fps

0yds 2200fps mv
225yds 1814fps 942ft-lbs
250yds 1774fps 901ft-lbs

I would use a 35yd zero with that load, puts you 2” high at 100yds assuming a 2.5” high optical plane.

16” Grendel with 129gr SP, 2260fps
250yds 1826fps 955ft-lbs


If you use the 129gr SST instead, the effective expansion threshold range increases to 300yds with the 16” and 250yds with the 12”.

With a 36yd zero in the 12” shooting 129gr SST, you have a no-hold zero out to 200yds, which puts POA 1.9” high at 100yds, -2” at 200yds.

18” Grendel with 129gr SST changes things quite a bit with effective range out to 400yds assuming a 2450fps mv, 50yd zero works best on that for 200yd no-hold setting, which is only .9” high at 100yds.

I’ll have to do one for 129gr ABLR later. That really changes things even more for the better. Gotta get back to filling orders.