Originally Posted by aramarine6
I'm not saying you are wrong. I just disagree. Ill consult my ballistics books and actually test it for myself with various different powders. And like I said accuracy isn't my main concern as 100 yards would be a very long shot in a laurentian forest cover of northern Wisconsin. My 45 grains of varget with a 168 will be my control group. I'll test different powders and projectiles to see what will give me what I'm looking for. I was just curious if anyone has any actual data. So far no one has given me real world tested velocities out of a 16.5 barrel.
Boom tube is correct about the pressure curve. The high presses curve that occurs, which in turn propels your bullet downrange, occurs during the first 4-6 inches of the barrel. The remaining " bleed off" pressure is what continues the push, aided my more barrel length.
With a shorter barrel, however, faster burning powders do pick up some of the velocity loss, if a slower powder is otherwise used.
My recommendation, would be, XBR8208, H322, or H335, or 3031.
I agree with Boomtube . You would need to see a peak pressure curve chart from a pressure Gage equipped rifle. It's amazing what goes on in that milli second in time, and PSI spike. Interesting Stuff!
PS, another variable on the burn rate of choice, is your twist rate.