Firpo,
I ran that load at 28 grains of H-4895 with a Lyman/Hobson 181 grain cast bullet and it came out at 1,565 fps and 11,626 psi predicted. This is a tad slower and a good bit lower on pressure than what you are showing. That powder can go a lot higher before it gets close to Pmax. As for “recoil”, the physics of it is as Mike explained, the total weight of the ejecta times the velocity. The “felt recoil” is more subjective and while physics are still the law, I believe that the RATE of acceleration has a lot to do with it along with other factors such as the shape of the stock and weight of the gun. Slow powders generally have a longer period of acceleration because the burning curve is longer but you usually need more powder to get the same velocity as a faster burning powder, so there is more “ejecta” and more recoil. However, for me, I feel the recoil as more of a push than a sharp jab and think the recoil as being “softer” than with faster burning powders. This idea usually generates a lot of comment because it is completely subjective and not backed up by any real science.
Thanks, Diz
I ran that load at 28 grains of H-4895 with a Lyman/Hobson 181 grain cast bullet and it came out at 1,565 fps and 11,626 psi predicted. This is a tad slower and a good bit lower on pressure than what you are showing. That powder can go a lot higher before it gets close to Pmax. As for “recoil”, the physics of it is as Mike explained, the total weight of the ejecta times the velocity. The “felt recoil” is more subjective and while physics are still the law, I believe that the RATE of acceleration has a lot to do with it along with other factors such as the shape of the stock and weight of the gun. Slow powders generally have a longer period of acceleration because the burning curve is longer but you usually need more powder to get the same velocity as a faster burning powder, so there is more “ejecta” and more recoil. However, for me, I feel the recoil as more of a push than a sharp jab and think the recoil as being “softer” than with faster burning powders. This idea usually generates a lot of comment because it is completely subjective and not backed up by any real science.
Thanks, Diz
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