About 2 years ago, I bought a Crosman NitroPhenom that is supposed to get up to 950 fps in a .22. So I went to the range today to chrono some loads for my lever guns, and I brought the air rifle along. I tried 3 different pellets: Gamo Magnum 15.43 gr., Crosman Copperhead 14.3 gr. round head and Crosman flat head (no weight given). The best I was able to get was with the Gamo's, and I attained a max of 650 fps. Still pretty good to knock of small critters, but farrrr from the listed data.
Actual vs. published velocities
- Thread starter Papaclaude
- Start date
That's sound like quite a bit of difference but...
Unless you know and can recreate the "exact conditions" that led to that (claim) rating it's tough to call them out on it.
Same thing with factory loaded CF ammo - rated at say 2900 fps - but that's only with a 26" barrel @ 70 degrees, shot indoors, with 40% humidity etc etc.
Still you are at least 30% "below" the rated fps - any chance you have a seal going somewhere?
Unless you know and can recreate the "exact conditions" that led to that (claim) rating it's tough to call them out on it.
Same thing with factory loaded CF ammo - rated at say 2900 fps - but that's only with a 26" barrel @ 70 degrees, shot indoors, with 40% humidity etc etc.
Still you are at least 30% "below" the rated fps - any chance you have a seal going somewhere?
You have to find out if the Crossman was tested with PBA .22 ammo.(9.8gr)
PBA is MUCH lighter than lead, and shoots faster.(and is pretty much inaccurate)
Gammo is famous for using PBA to get their velocity test numbers.
Don't know if Crossman is doing the same.
PBA is MUCH lighter than lead, and shoots faster.(and is pretty much inaccurate)
Gammo is famous for using PBA to get their velocity test numbers.
Don't know if Crossman is doing the same.
Many airgun makers post the highest possible MV achieved with ultralight pellets. To retain best accuracy, it is not desirable that pellets have too high a velocity. As the speed of sound is approached, trans sonic turbulence causes inaccuracy. A pellet performs best if it is not going faster than 950 fps.
I really doubt it. The gun has seen little use and is kept lubed exactly to spec, etc. One of these days, I'll try to get a few PBA pellets to try and see what I get.
Good to know. Thx. I must be getting close to the 1000 shots.
I'm also going to try the assortment of hunting pellets LeBaron's has in .22, to see what I can work out in terms of power and accuracy.
Yep, they lie. And/or using mere spit balls to test velocity. You'll be able to knock squirrels down cleanly out to 40 yards with that rig if you can get the accuracy.
