Last edited by Jackel; 26-03-2019 at 05:55 PM.
Viking Mk2 .177/.22 bullpup, BSA Scorpion SE .177, BSA Scorpion .25 100M gun, BSA Scorpion .224 100fpe 100M gun,
Evanix Blizzard .257/.357 200M BR, Evanix Sniper X2 .45 at 270 fpe
If you don't believe it do the math, try it in a Chairgun or test it IRL. .22 pellets are around 0.03-0.035 in BC while .224 bullets are in 0.110-0.140 range. .25 is around 0.035-0.040 against 0.140-0.190 with .257 bullets. Reading this thread might also help And yes, I've been competing bullet shooters with my .25 pellet gun at 100M BR and it is a very tough job to keep up.
Last edited by Jackel; 26-03-2019 at 05:56 PM.
Viking Mk2 .177/.22 bullpup, BSA Scorpion SE .177, BSA Scorpion .25 100M gun, BSA Scorpion .224 100fpe 100M gun,
Evanix Blizzard .257/.357 200M BR, Evanix Sniper X2 .45 at 270 fpe
That .172 air is impressive , hits with a right old whack
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote!" -- Benjamin Franklin
At the risk of pretending to be ballisticboy, I must point out that BC changes with velocity.
But your general point is right. Waisted pellets were designed for smooth barrels at low velocities. Then rifled barrels made them more accurate. Amazingly so (indoor 10M match, for example) at close ranges. But they and their associated barrels were historically made for 10-25 metres, without much regard for either retained energy or longer range accuracy.
If airguns had never existed, we would probably now, in ineventing them, at 12ft-lbs, go for a bullet-shaped projectile in 4-5mm or so diameter, optimised (with associated rifling twist) for accuracy to 50M.
I'm not pretending to be Ballisticboy either but if the Ballistic Coefficient is calculated to be changing at different velocities then you're calculating against the wrong/inappropriate Drag Curve ... or perhaps you're using a 'constant Cd' approximation.
Maybe you're thinking about the Drag Coefficient - which does indeed vary substantially with velocity.
George
Last edited by GPConway; 29-03-2019 at 06:45 PM.