Lenny Foffa
Well-Known Member
- Joined
- Mar 6, 2017
- Messages
- 1,528
Please allow a couple of stupid questions. Since I shoot an over bore cartridge from the 70"s . A 270 Weatherby Mag. I am trying to keep up. with the rest of you.
#1, How does one determine the RPM of the projectile to such a fine number like 300KRPM or 309KRPM ect?? Is there a specific math formula ? #2 Does the load you develop , (same Bullet in the same barrel) )based on expected Muz Vel change the RPM of the projectile? (Example a 2900 fps Muzz Vel. load vs a 3000fps velocity load ) and #3 What numerical value does SG represent? Thank you for your patience and response
#1, How does one determine the RPM of the projectile to such a fine number like 300KRPM or 309KRPM ect?? Is there a specific math formula ? #2 Does the load you develop , (same Bullet in the same barrel) )based on expected Muz Vel change the RPM of the projectile? (Example a 2900 fps Muzz Vel. load vs a 3000fps velocity load ) and #3 What numerical value does SG represent? Thank you for your patience and response