Just curious how well .177 hmr and .22 bullets shoot out of a powerful pcp gun. Have anyone try it? I don't own a .177 hmr or .22 lr so I can not test it. If anyone can test it please post your results and accuracy.
Anyone have use .117 hmr .22 lr in pcp?
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For one a .17 cal HMR is a .172" projectile and is TOO SMALL for a Air gun barrel.
Also HMR bullets at JACKETED over a lead core. The friction a jacket bullet has over bare lead is a massive !! By design Powder Buring guns shooting Jacketed bullet are sized in such a way the the Mien & Max diameters of barrel & bullet are opposed so a good seal can be made with minimal blowby. Because the pressure of a burning propellant is so high the friction is easily overcome and the bullet easily go't out the barrel. ( The .22 WMR in which the HMR is based upon ) runs at 19,000 PSI and while unable to find the data, likely the HMR is above that a bit.
There have been some specialty made .172" PCP bullet shooters, but the rifling depth, Mien/max of fit has been modified to shoot a LEAD bullet able to do so at our typical PCP operating pressures.
just some FYI and thoughts shared ... nothing more.
Scott S
Also HMR bullets at JACKETED over a lead core. The friction a jacket bullet has over bare lead is a massive !! By design Powder Buring guns shooting Jacketed bullet are sized in such a way the the Mien & Max diameters of barrel & bullet are opposed so a good seal can be made with minimal blowby. Because the pressure of a burning propellant is so high the friction is easily overcome and the bullet easily go't out the barrel. ( The .22 WMR in which the HMR is based upon ) runs at 19,000 PSI and while unable to find the data, likely the HMR is above that a bit.
There have been some specialty made .172" PCP bullet shooters, but the rifling depth, Mien/max of fit has been modified to shoot a LEAD bullet able to do so at our typical PCP operating pressures.
just some FYI and thoughts shared ... nothing more.
Scott S
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In the Netherlands we have 100 meter airgun competitions and in the small bore competition (everything below .257) the .22 rimfire bullets remain as the "ultimate" projectile. The used projectiles are the RWS R100 rimfire bullets/slugs. In the hands of good shooters these airguns and .22LR bullet combinations bring tighter groups than what's common for pellets.
You have to have a rimfire barrel to make this work by the way, standard pellet barrels don't have the right dimensions to fit the projectiles
You have to have a rimfire barrel to make this work by the way, standard pellet barrels don't have the right dimensions to fit the projectiles
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I have some Eley slugs from the 90s we were testing in Career 707s. The shot well but actually had less power, more than likely from the friction Scott detailed. Also, the barrels are slightly different dimensions between rimfire and 22 airguns so you'd really need to fit a rimfire barrel to get best performance.
Bob
Bob
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