AusVarmint

G"day All
Just had to get this off my chest again.!!
This 1000fps advertising has people brainwashed,if its not doin that it must be inferior.
It's usually the one's that would not know fly shit from pepper.
I just get sick of hearing it, anyone knows you have AR and they instantly ask if it does 1000fps and then respond by saying well this such and such does why dont you get one of them,AAAHHHH.
Oh and then there the ballistic alloy pellets made oh so famous by that gamo advertisement that was spread all over you tube,HHmm COUGH-Bullshit.!!
Anyway rant over.
thanks for listening.
Regards
Native-27ftlb and believing.

Talk to the fellas at Nasal Delivery Systems... They'll get you there!

Is there any truth in the rumour that diablo pellet speeds exceeding 850 to 900 fps cause the pellet to become unstable and thus accuracy is compromised? Is there some relationship between the turns ratio of the rifling in the barrel to the velocity of the pellet and the weight of the pellet? From memory, the target rifles used in the ISSF matches are fairly slow shooters, somewhere around the 750 to 800 fps. Could there be a reason tor this other than not wanting to damage the target frames? Surely if faster was better we would see some really fast (and very light) pellets zipping downrange at the Olympics?
Dennis.

Hilly wrote:Is there any truth in the rumour that diablo pellet speeds exceeding 850 to 900 fps cause the pellet to become unstable and thus accuracy is compromised? Is there some relationship between the turns ratio of the rifling in the barrel to the velocity of the pellet and the weight of the pellet? From memory, the target rifles used in the ISSF matches are fairly slow shooters, somewhere around the 750 to 800 fps. Could there be a reason tor this other than not wanting to damage the target frames? Surely if faster was better we would see some really fast (and very light) pellets zipping downrange at the Olympics?
Dennis.

Tom Gaylord suggested 900FPS in any calibre was a good rule of thumb.I agree with him.You should always choose pellets that keep velocities under 900FPS for best accuracy.
It can be impossible in the Rapid MK1 .177 which doggedly stays about 1000FPS even with Kodiak 10.6 and JSB 10.33.
Match 10M airguns are now 5.5FP and less.

Does this mean that the newer match guns have pellers chugging along at somewhere around the 600fps mark? I know you can watch the pellet all the way to the target if the light is right, especially with air pistol. Interesting trajectory when you get out to 25M with an air pistol.

Hilly wrote:Does this mean that the newer match guns have pellers chugging along at somewhere around the 600fps mark? I know you can watch the pellet all the way to the target if the light is right, especially with air pistol. Interesting trajectory when you get out to 25M with an air pistol.

Most shoot a Beeman Match 8.09 gns at around 550FPS.

It's a complicated affair Hilly.900fps is a middling rule of thumb, some don't make it much past 800fps, some do the 1000fps accurately. I've had both and some inbetween.
I believe the 600fps region is the most accurate for flat headed .177wadcutters, read it somewhere in the past.
A lot of the problem is matching the pellet to the barrel and then optimising for speed.
The faster you go the more lead barrel fouling occurs and it seems exponetial once you pass the 800fps mark. My own experiences suggest the longer pellets such as jsb 16gn and barracuda can excel past 20ftlb in .22 whereas the shorter stuff ie hnftt and premiers go pear shape much after 20ftlb.
Found much the same in .177 and .20cal too. The annoying thing is the anomallies where you get the occasional rifle that will shoot 14gn at 30ftlb accurately .

Neil

Well, it would seem that there are no hard and fast rules in this game. It also seems that, generally speaking, slower is better when it comes to accuracy. Could this be why those golden gamo wonder pellets shoot like horse manure in evry gun I have tried them in?
Hang on, I tell a lie here, they worked OK in a Crosman Pumpmaster, got a 2" group at 5 yards (4 pumps) with them which was better than the BBs I had at the time.

somebody needs to set up the high speed camera system they used in Matrix and film pellets along the flight path at different speeds. I'd love to see scientific evidence of the effect velocities above 1000fps have on .177 and .22 pellets...