Grendelhunter.com - Complete 6.5 Grendel Upper

[LRRPF52]

You normally don't see 70fps difference between 16" and 18".

[SIZE="3"]17.6" Lilja barrel:[/SIZE]
123gr Hornady SST factory 30JUN2015
2441
2467
2477
2489
2481
AVG: 2471fps

123gr Factory SST 17MAY2016 64˚F
2451
2449
2473
2456
AVG: 2457fps

120gr Scenar-L PF load
2505
2504
2532
2518
2498
AVG: 2511fps

[SIZE="3"]18.5" Lilja barrel:[/SIZE]
123gr Hornady SST factory 30JUN2015
2468
2441
2421
2495
2453
AVG: 2456fps

[SIZE="3"]16" AA/Shaw barrel:[/SIZE]
123gr Lapua Scenar Precision Firearms factory 03APR2012
2447
2451
2454
2450
AVG: 2451fps

123gr Lapua Silver Scenar Moly Factory Precision Firearms Load 90˚F
2522
2484
2582
2518
2503
AVG: 2522fps

123gr Hornady A-MAX factory 25MAY2013
2365?
2470
2422
2470
2460
AVG: 2439fps

These have all been with a Chrony Beta model, 15ft from the muzzle. The 6.5 Grendel Reloading Handbooks have a ton of data and barrel length estimator graphs.