Paul5388
US Veteran
When I clocked those at 1620 fps, they were shot out of a 6" Security Six. The 1575 fps loads were clocked out of a 6" M28-2. With a .5 gr reduced load, I clocked 1460 fps out of a 4" M66-2.
I normally load at the original SAAMI pressure specs of 45,000 cup. Regardless of what anyone says, they aren't going to produce the same at 35,000 psi. I've been shooting that Sierra load since 1972 and to the surprise of most, I've never had a problem and no flame cutting!
Here's the M28-2 I bought new in 1972.
This is the same gun after shooting its first 5 H110 loads using 125 gr bullets.
Here's the M66-2 with very little flame cutting (no, I don't shoot H110/W296 in it).
I normally load at the original SAAMI pressure specs of 45,000 cup. Regardless of what anyone says, they aren't going to produce the same at 35,000 psi. I've been shooting that Sierra load since 1972 and to the surprise of most, I've never had a problem and no flame cutting!
Here's the M28-2 I bought new in 1972.

This is the same gun after shooting its first 5 H110 loads using 125 gr bullets.

Here's the M66-2 with very little flame cutting (no, I don't shoot H110/W296 in it).
