realistic velocity out of 16" barrels

[LRRPF52]

The Hornady factory ammo data is from a 24” pipe.

I had a Howa 22” Grendel, and it showed 16” velocities compared to my ARs with factory Hornady 123gr American Gunner:

2469
2456
2465
2463
2437

Avg: 2458 (15ft from muzzle)

With 31.2gr of CFE223 2.253” COL Lapua brass, 123gr Hornady
2599
2557
2582
2617
2617
2564
2586
2608
2619
2566

Avg: 2592fps

129gr SST hand loads, Lapua brass, Rem 7.5 SRP, Leverevolution
COL 2.310”
31.7gr gave me 2534-2545fps

I never chronod a factory 129gr load from it.

From several 16” and 18” AR-15s, I see 2440-2500fps with 120-123gr factory ammo from Hornady and Precision Firearms.