who knows of the heaviest .177 pellet?

[ballisticboy]

Accurate and retaining its energy better than any other pellet due to the boat tail shape.

Actually, based on published energy retention figures in the magazine tests the only reason the .177 piledriver retains its energy is due to its weight. The calculated Cd is higher than many diablo pellets meaning the boattail as designed is doing nothing for the drag. Probably due to the shape and angle of the boattail which are both critical for correct operation. But at least it is a genuine attempt at a true spin stabilised pellet.

[delby52]

Actually, based on published energy retention figures in the magazine tests the only reason the .177 piledriver retains its energy is due to its weight. The calculated Cd is higher than many diablo pellets meaning the boattail as designed is doing nothing for the drag. Probably due to the shape and angle of the boattail which are both critical for correct operation. But at least it is a genuine attempt at a true spin stabilised pellet.

So is the very lightest 22 pellet going to have a flatter trajectory
than the very lightest .177 pellet?

[ballisticboy]

So is the very lightest 22 pellet going to have a flatter trajectory
than the very lightest .177 pellet?

The flattest trajectory to a first order is going to be with the lightest pellet which will give the highest muzzle velocity for a fixed muzzle energy. That in general will be a .177 pellet. The drag coefficient will make a difference but over 50 yards it is going to be very small. The lightest pellet will not necessarily have the worst wind response either so don't worry about that. The best pellet will be the one you can hit various targets at different unknown ranges first time with.

[delby52]

The flattest trajectory to a first order is going to be with the lightest pellet which will give the highest muzzle velocity for a fixed muzzle energy. That in general will be a .177 pellet. The drag coefficient will make a difference but over 50 yards it is going to be very small. The lightest pellet will not necessarily have the worst wind response either so don't worry about that. The best pellet will be the one you can hit various targets at different unknown ranges first time with.

So a .177 pellet will not always have the flattest path or lose it's energy quicker than a .22 pellet The old cal debate should be wide open! A chrono is now essential to judge performance of your riflle with a variety of pellets and calibres . I know that co2 air guns perform better higher energy with larger pellets due to the greater weight, is that the same with pcp and spring?