Don't let the quoted muzzle velocities confuse you. They are usually quoted in reference to a rifle barrel that is 18" or more in length. The important consideration is muzzle energy since that translates according to Newton's third law into the "for every action their is an equal and opposite reaction". Muzzle energy of the bullet = "the action", slide rearward motion = "the opposite and equal reaction". Most high velocity ammo lists at 1250 fps out of a rifle barrel and 1050 fps from a pistol barrel. Most standard velocity ammo lists at 1150 fps from a rifle and 950 from a pistol.
Muzzle energy for high velocity ammo from a rifle is about 140 foot-pounds, in a pistol that translates to about 100 foot-pounds. Standard velocity ammo generates about 117 foot pounds of energy at the rifle muzzle and 80 foot pounds at muzzle of a pistol. All of the above assumes a standard 40 grain bullet.
The important number for comparative puposes is the muzzle energy which translates directly into slide velocity. High Velocity ammo has 25% more muzzle energy than Standard Velocity ammo when fired in a pistol. That means that the slide is smacking the recoil butress 25% harder each time the slide reaches its maximum rearward position. The frame absorbing this energy directly through the butress is what leads to frame cracking in Big Button guns.
Winchester lists the following ballistic info for their ammo:
Super-X (high velocity):
MV rifle :1255 fps, ME rifle :140 f-p
MV pistol :1060 fps, ME pistol :100 f-p.
T-22 (standard velocity):
MV rifle :1150fps, ME rifle :117 f-p
MV pistol :950fps, , ME pistol : 80 f-p.
Dynapoint:
MV rifle :1150fps, ME-rifle :117f-p
MV pistol : 950 fps, ME pistol : 80f-p
To make a long story a little longer Dynapoint ammo has exactly the same ballistics as the T-22 standard velocity so you can consider it to be Standard velocity.
The recoil spring acts as a buffer to the slide impacting the butress. Make sure that you've got a fresh recoil spring in your Victor in any case. I recommend replacing the spring you have in the gun with a 6 pound variable rate heavy duty spring from Wollf. . You'll find instructions on how to change the spring on my web-site:
http://home.roadrunner.com/~jbarta/otherstuff.html