could be lots of things and I'm not the expert here.
However I see Hodgdon list a 150gr max with 2208 of 2900fps with a 24" barrel while I see some other powders get up to 3000 fps.
The Sako loads are listed at 2850 and you are getting 2650 with them so thats about right with a 25 fps velocity loss per inch of barrel.
Could be a number if things, have you checked your COA (Overal lengths), neck tension, and harder to deal iwth is case volume. You may be using brass with a small powder volume, (thicker brass and base). This will push up pressure and at the same time limit velocity due to a lack of power (energy).
Can you list the brass, primers and charge weight you are using. Then someone with more experiance than me may be aboe to chime in.
Z
Bookmarks