I recently got an old Remington Model 24 in 22 short caliber. This is a semi-automatic rifle made between 1922 and 1935. The folks at Remington advised not shooting modern ammo in it. On the barrel it says "22 short smokless greased ammo". I asked Remington what velocity 22 short ammo was around 1935 and they said that information wasn't available. I found some CCI 22 Short Target at about 750 fps, and the gun functioned ok with it, but seemed to be in slow motion. Does anyone know if "Hi-Speed 22 short ammo would harm this gun? Has the velocity of 22 short ammo changed much over the years?