Thread: The Maths of Recoil

Originally Posted by tikka

I shoot a lot of animals with 30 cal sub and projectile choice makes a huge difference in quickness of kills for example the Lehigh Defence controlled fracturing with its petals sharing off in multiple directions resulting in more damage and had a few instance bang flops with them on a hilar shot. Shot a red the other day and only went 15m on a broad side lung shot, they work a lot quicker than a standard mushroom design projectiles.

I reckon subsonic .22lr is better on possums than high velocity...almost like it keeps all its energy inside animal and helps it fall out of tree Vs through n through and possum hangs up.....between the glowing red bits it matters not a hoot,but chest shots ,the subsonics win.

Originally Posted by SixtyTen

https://www.jbmballistics.com/cgi-bin/jbmrecoil-5.1.cgi

The jbm calculator is using an exit velocity of 4700ft/sec to calculate the contribution of the propellant.
I believe this was also the figure given historically in Sierra handbooks.

Bit suprised bore diameter has not been mentioned ie same weight projectiles but different calibre in relation to recoil.