("From what I have gathered thus far, any airgun calibers appear to have a power-ceiling, with the larger calibers having more fpe potential. Meaning the greater the area for the air to operate in AND ON, the greater the power potential.
The rebated boat tail's very minute increase in barrel volume (the "area in" part) is not what I'm getting at here, but the "area on". That boat tail base provides more area for the force of the air to be applied. A substantial increase in area over a plain base. I'm thinking this additional area just might provide some of the benefit a larger caliber also brings.")
Hey Butcher:
Do know of any links you can refer me to so I can read up on exactly what you're trying to explain in the quoted sentences above?
I believe you know what you're talking about but, I'm having trouble understanding it. I thought perhaps if I read the same things you've read concerning air guns and power ceilings and surface areas and such, I could better understand what you're getting at.
The bullet study that I googled up the other day that lead me to design the bullet in the drawing I provided seemed to indicate something slightly different. Of course this study I'm referring to applied to conventional firearms; not air guns of any kind. I just assumed that this same study might have some relevance to air guns as well.
Following is the link to that study.
http://www.swage.com/ftp/rbt.pdf
It's true I'm looking to make an accurate air gun bullet but not to the exclusion of terminal ballistics. Thats where a shallow hollow point comes in. With air gun slugs cast as soft as they are, even a shallowest hollow point should induce expansion even at the slow speeds that these big bore air guns function under.
Even a slight expansion should compensate for the generally low terminal ballistics of an otherwise pointy nose bullet, while hopefully still retaining its aerodynamics and accuracy .
HollowPoint