Well….a airgun projectile is shot with max of let’s say 1050 fps. And in a traditional bullet rifle with manyfold of that. That is probably a huge factor in the mix of ballistics…If the same rules would apply to an airgun as to a powder burner things would have been simple from the beginning I guess. Airguns have their specific aspects to take into accounts I guess as far as barrel profiles and ammunition combo’s and many other things are concerned. Explorations and development of this obviously stopped after invention of the diabolo ammunition sooooo long ago. Till recent years ..( thanks to “the marketing machines” )Back in 2005 I had a Theoben Rapid MK2 in .25cal. I casted slugs using a RCBS .25ACP 50grain bullet mold. The barrel used by THeoben for their .25cal airguns was made by BSA. The bullets needed some sizing in order to fit and I ended up with having a bulletsizer made(polished) up in .2505cal. From here I felt I had a slugshooter. Hitting the bottom of 12gauge was no problem at 30meters. The trajectory was ofcouse way more arched however from our porch we have a slope some 200meters away and here one could see the impacts. I was able several times to hit spots(1x1ft) of dry ground. The BSA barrel had a conventional styled squared rifling, but the grooves weren`t that deep. My point is simple. A traditional rifling profile ought to work like it has always been doing for bullets.
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