Fac pellet trajectory

[SHOTTGUNKELLY 11]

When an air rifle is at fac power level ,ie 28 ftlbs does a .22 pellets trajectory become as flat as a .177

Cheers shottgunkelly

[8shot 192]

i THINK a .22 running at 18ft/lb will fly as flat as a .177

[19powell90 89]

Use hawke brc or chairgun pro

[matt_hooks 188]

All depends on velocity. The pellet is affected to the same degree per unit time, so the faster it's going, the "flatter" the trajectory. This all depends then on the weight of the pellet.

 

The formula for calculating ME is ME=1/2 x mass x velocity squared.

 

In reality this translates as, using our standard units of feet, pounds and seconds, and weights in grains...

 

Wp = pellet weight

Vp = pellet velocity

ME = muzzle energy

 

ME = (Wp.Vp.Vp)/450240

 

So with ME at 28 ft.lb, and pellet weight at 20 grains as an average.

 

(28 x 450240)/20 = Vp.Vp

 

so pellet velocity, Vp, for a .22 firing a 20 grain pellet at 28 ft.lb would be 795fps

 

A .177 with a weight of 9 grains would have to be below 770 fps to remain legal, so the two trajectories should be very similar. The .22 might actually be a bit flatter as it is likely to have a better BC.

 

You can play with the figures, but those are "average" figures to give an idea. It depends on pellet weights mainly.

[SHOTTGUNKELLY 11]

Cheers everyone