Thread: Hornady sub-x 175gr load data...

Originally Posted by longshot

12.7 gr TB for 1061 fps

found at
https://hodgdonreloading.com/rldc/

although I note that at
https://hodgdonpowderco.com/wp-conte...ta-final-1.pdf

it is 10.5 gr TB for 1039fps with the 190gr sub-x


FWIW I use 10.0 gr TB with 165gr projectiles for subsonic .308, 18" barrel, 1/10 twist.

Yep seen that, hence why I'm cross checking.

Their data off the website doesn't appear to make sense...

190gr Sub-X - TrailBoss - 2.690 length - Max powder 10.5gr - Vel. 1039fps - Pressure 30100psi
175gr Sub-X - Trailboss - 2.495 length - Max powder 12.7gr - Vel. 1061fps - Pressure 27200psi

2.2 gr extra powder for the 175gr pill, I realise it's a little shorter than the 190gr but seated almost 5mm shorter for 22fps extra speed yet 2900psi lower pressure? I think I'm missing something or overthinking it, but 2.2gr extra powder for 2900psi less pressure indicates something I haven't experienced with Trailboss before. This is why I've asked on here if someone has actual real world results, as the info I have is basically the opposite of what I'd expect!