yury
Well-Known Fanatic
Based on information published in the Front Sight Magazine about recoil Sep 2017, https://uspsa.org/magazine/2017-09/#76, and one from Nov 2016. Guy Neill explains what is Free Recoil Energy (FRE), how to calculate it and how it changes while shooting. Good stuff.
So… If I’m reading it right, a light gun has greater FRE than a heavier gun for the same ammo. Since the bullets might weight something, especially in 19rd magazine, it might be a difference in 0.5 ft-lbf (0.67 joules) in FRE when loading 10 instead of 19 rounds. (For comparison 1 joule is an energy of clapping hand)
A beginner needs to take any (un)fair advantage they can get Does it make sense for them to:
So… If I’m reading it right, a light gun has greater FRE than a heavier gun for the same ammo. Since the bullets might weight something, especially in 19rd magazine, it might be a difference in 0.5 ft-lbf (0.67 joules) in FRE when loading 10 instead of 19 rounds. (For comparison 1 joule is an energy of clapping hand)
A beginner needs to take any (un)fair advantage they can get Does it make sense for them to:
- fully load magazines all the time, e.g. even when stage needs 4 rounds?
- 
start using heavier bullets, e.g. 147gr instead of 115gr in 9mm case?
- add something heavy to the production gun magazine â€" the USPSA rules does not forbid such mods?