Ramshot Tac and 123gr Amax results

[JASmith]

Outstanding group!

Looks like we are losing about 150 fps. by giving up 4" of barrel length. http://www.nosler.com/nosler-load-data/65-grendel/

Not so sure about that. We frequently see significant variations of velocity when going from one chamber to another chamber cut with the same reamer. The variations get larger when there is throat wear, tweaks to reamer design, and so on.

For example, we see in Volume 2 of the 6.5 Grendel Reloading Handbook with 27.0 gr TAC and the 123 gr AMAX:

• 16" Bbl 2218 fps
  
• 24" Bbl 2397 fps
  

While the OP velocity is about 70 fps below the trend line suggested by these loads, that difference is within what might be called normal barrel to barrel variation.

Ammoguide.com has more loads and we see greater variation in the reported velocities.