Assuming equal ejecta weights, and equal velocities, one shell may develop much lower pressure than the other. One reason for this can be burning rate. The one which develops the lower pressure of the two can also have a pressure curve that takes place over a longer period of time (and subsequently uses more of the barrel to do so) than the higher pressure load. This charts as a more rounded pressure peak. The other pressure peak can resemble more of a spike, and be taking place over a shorter period of time. The one with the "spiked" pressure peak will exhibit a sharper recoil sensation than the one with the more rounded peak which occurs over a longer period of time.
I, and countless others on this BBS, have experienced and described the perceived recoil on two different shells, of equal velocity and shot load, as having vastly different recoil sensations. Way too much to be explained by 4 or 5 grs. difference in powder weight. One being most often described as a sharp lick, the other as more of a push.
All of us are not the same crazy. There IS something to this.
SRH
Last edited by Stan; 08/30/12 06:39 AM.
