Pellet Weight for Old Hammerli Velocity Testing?
Posted: Sun Jan 19, 2025 2:10 pm
I'm rebuilding a whole bunch of Hammerli 480/480K air pistols for the college team I help coach. After repairing the regulator, I test the velocity to check for consistency and set it close to the nominal 146 m/sec in the manual.
The team shoots 7.0 grain RWS basic pellets, and I've been using those for my testing. From working on other air pistols, the velocity difference between 7.0 grain pellets & 8.2 grain pellets can be as much as 10 m/sec. I'm curious as to what pellet weight Hammerli might have used when they came up with their velocity spec. It might be indicated on a factory test target, but I don't have any of the original documents for these pistols. The rumor was that we got them in package deal from larry's Guns after the West Point team traded them in for newer pistols...
Does anyone have an ancient test target kicking around? The 480, 480K, 480K2 and AP40 are all very similar as far as the specs & barrel. I suspect they all used the same procedure & pellet weight when test firing them. I don't recall when pistol manufacturers included test targets with their pistols, but I think it was common practice even when the 480's came out.
Thanks!
The team shoots 7.0 grain RWS basic pellets, and I've been using those for my testing. From working on other air pistols, the velocity difference between 7.0 grain pellets & 8.2 grain pellets can be as much as 10 m/sec. I'm curious as to what pellet weight Hammerli might have used when they came up with their velocity spec. It might be indicated on a factory test target, but I don't have any of the original documents for these pistols. The rumor was that we got them in package deal from larry's Guns after the West Point team traded them in for newer pistols...
Does anyone have an ancient test target kicking around? The 480, 480K, 480K2 and AP40 are all very similar as far as the specs & barrel. I suspect they all used the same procedure & pellet weight when test firing them. I don't recall when pistol manufacturers included test targets with their pistols, but I think it was common practice even when the 480's came out.
Thanks!