Lighter vs heavier pellets? 880 FPS?

[FIDI_G]

Whats the general consensus on speed vs weight of a pellet?

My JSB seem to do well at 880fps

But my cheaper lighter Crossman premier hollow point dont seem to do as well at this speed. Meaning I lower my hammer spring to bring it back down to 880ish FPS

Do you typically go up or down on lighter pellets? The pellet is going to travel a fair bit faster if I dont adjust it. Just trying to dial them as best I can.

For best consistent accuracy your supposed to dial it in around 880ish give or take 20fps is that correct? Does it then matter what the weight of the pellet is?

 

[AirShot]

Many have found a pellet is most accurate at a certain speed. You have to experiment to find what that is. Enough people have experimented with this that there is probably someone that can give a starting point on a certain pellet

 

[dgeesaman]

For any given amount of air, on a given airgun, you get roughly the same amount of energy.

So really, it’s a matter of what you want to do - do you want a flatter, faster projectile?

880 is not a magic number, but it’s a good place to start. This weekend I tuned my Crown to shoot 18.1s at 700fps. Very accurate. There are many options.

 

[Struckat]

I try to settle on one pellet for each gun. There are exceptions, maybe two or three for some, but I try to find the best one and stick with it.

The only time I will tune for a switch is when I want run wad cutters in a gun that I don’t normally shoot them through. But that is rare as I have dedicated wc guns.

 

[Airgun-hobbyist]

When tuning, I like to first adjust the power/speed up to it's maximum without wasting too much air after the shot. Then I will test grouping and slowly back down the adjustment for a balance between accuracy and speed. Generally, there's usually a sweet spot for that balance in power, group size, and bucking the wind.

 

[AirShot]

I cant speak for PCP guns as I never owned one, but I can speak from over 35 years of spring gun expertise that a pellet has a speed at which it flys most accurately. Not interested in all the sciences and reasons why but thru experience and what rifle/ barrel the pellets goes thru, the velocity controls the accuracy. On most of my higher powered springers over the years the CP lites at 7.9 gn lost accuracy beyound 900 fps, sometimes even high 800 would loose accuracy, now the JSB 8.4 are holding accuracy at speeds up to about 925 or so. Your findings may differ!! Therefor you need to experiment to find the speed your pellets like in your particular gun. This is not an exact science, but it can give you a starting point then you can fine tune from there..

 

[JEFFPPC]

At that my velocity my TX like 10.33. At 800 fps it likes 8.44. Now not exactly true. With the 10.33 that brings the velocity to 800fps. Seems to me the 800 atea brings on the small groups with what weight gets you there.