HFT 500 power drop-offs
Posted: Fri Jul 21, 2017 8:44 am
Hi Folks, I hope someone can help here.
In every hundred shot string from my HFT 500 - ie every fill - three or four pellets drop out of the group by around 2 inches at 30 yards. Checking on the chrono, these correspond with drop-offs of about 40-50 fps in MV, and I presume the rest of it is something to do with changed barrel harmonics. Each drop-off only affects one shot, and then things are right back to normal. I get similar drop-offs whatever pellet I try, and they still happen with weighed pellets, so I'm pretty sure its something to do with the gun itself.
My gun is thoroughly cleaned and degreased, the hammer rail and valve stem polished within an inch of their lives and every seal checked. Cleaning the barrel makes no difference.
Anyone got any ideas what this might be, and how to fix it?
Alan
In every hundred shot string from my HFT 500 - ie every fill - three or four pellets drop out of the group by around 2 inches at 30 yards. Checking on the chrono, these correspond with drop-offs of about 40-50 fps in MV, and I presume the rest of it is something to do with changed barrel harmonics. Each drop-off only affects one shot, and then things are right back to normal. I get similar drop-offs whatever pellet I try, and they still happen with weighed pellets, so I'm pretty sure its something to do with the gun itself.
My gun is thoroughly cleaned and degreased, the hammer rail and valve stem polished within an inch of their lives and every seal checked. Cleaning the barrel makes no difference.
Anyone got any ideas what this might be, and how to fix it?
Alan