No, if you are comparing one powder to another powder, where both yield the same muzzle velocity with the same weight of ejecta (shot plus wad) with different pressure values.
Yes, if you're comparing one load with certain amount of powder "A" to the same load with a little more of powder "A", BUT the difference in recoil has more to do with higher muzzle velocity than the higher pressure.
Setter, Thanks for the information. Been using 19.8 grns Green dot (not really to bad for recoil) but thought I would try something else. I'll try a slower powder and will try to stay around 1200 fps. Mike
Mike- I can give a simple formula that is rather accurate. That is:
velocity X weight of shot = amount of bump on your cheek.
Powder burn rates and recoil-- The following two periods in this sentence are different sizes (. .). They vary by about 1/1000 of an inch. Can you see the difference? The size difference in these two printed symbols is much greater than the difference between a slow and a fast burning powder
(+- 3/10,000 of a second).
To my mind, there are three "kinds" of recoil involved in a good target load. The first, of course, is actual or "real" recoil. This is a simple matter of physics and is determined by the weight of ejecta (shot/wad) and speed of that ejecta. It is determined by simple mathmatics. The second "type" of recoil is felt recoil. Determining factors are such things as gun weight, shape/fit of the gunstock, size of the recoil pad (if any) etc. A simple example of this is if you have ever fired the old M1903 Springfield rifle with both the original straight grip stock vs firing the same rifle with the later pistol grip "C" stock. Actual recoil with either is the same, but the "felt" recoil with the pistol grip stock is significantly less for most people. This also helps explain the current poplularity of the unsingle trap gun. The low position of the bbl puts the recoil in more of a straight line, resulting in less upward "kick" felt against the face, hence less felt recoil for many. The third "type" of recoil is what I call "perceived" recoil. This is purely a subjective feeling of recoil and is completely personal. It is here where, I think, you can place such things as powder burn rates. For whatever reason, some people "perceive" different powders as having less or more felt recoil. Although the physics of this are lacking, the perception of recoil differences can be valid for those who feel it makes a difference. For this reason, I would say go ahead and experiment with different loads. If you find one which you perceive as providing less or softer recoil, by all means, use it. It is unlikely you could actually measure much, if any, difference but if it "feels" better then it can only help your shooting. After all, many say that sport shooting is 99% mental in any case, so whatever helps your mental attitude towards more breaks can only be good for your game.
Here are typical pressure time-courses that Pat is referring to. Note the time scale. I regret they look nothing like what you've seen in the imaginative hand-drawn graphs in trapshooting magazine but . . .