I tested the 153.5 LRHT in my 26" Proof Research barrel (8-twist), TL3 prefit. Wasn’t sure if they’d stabilize, but it looks like they did just fine.
Ran H4350 from 39.0 to 41.4 grains. 39.0 gr gave me around 2600 fps, and 41.4 gr was just over 2700 fps. It seems like there’s still room to go higher if needed.
The lower charges seemed to shoot a bit better. That could be due to the barrel heating up, fatigue, or a slight pickup in wind later in the session.
Even at 2600 fps, I think I’m getting a wind advantage over the 140 Hybrids. Probably gaining a 0.1 MRAD advantage at 1000 yards in a 10mph crosswind. Not sure if it is worth it or not.

Ran H4350 from 39.0 to 41.4 grains. 39.0 gr gave me around 2600 fps, and 41.4 gr was just over 2700 fps. It seems like there’s still room to go higher if needed.
The lower charges seemed to shoot a bit better. That could be due to the barrel heating up, fatigue, or a slight pickup in wind later in the session.
Even at 2600 fps, I think I’m getting a wind advantage over the 140 Hybrids. Probably gaining a 0.1 MRAD advantage at 1000 yards in a 10mph crosswind. Not sure if it is worth it or not.
