The Scandinavian
New member
Does anyone else think that the time could be ripe for a re-think of how IPSC major and minor power factors are calculated?
I was wondering about using a true 'power' based measurement rather than the current momentum based calulation. At present, the awesome .224 BOZ (say 50gr @ 2000fps) doesn't even make 'minor', but a bowling ball only has to be rolling slightly across the floor to make 'major' easily. So there: A projectile that's too low pf to make minor will penetrate all kinds of armour, and still be lethal, and yet another projectile with a massive pf won't even bruise your foot if it hits you.
So much for IPSC Power factor then.
On a more practical level of course it means that you can have 40 loads that don't make major and yet have way more true power (measured say in Ft.Lbs) than some 45 loads that make major easily.
The reason for this apparent discrepancy is that the kinetic (movement) energy of a projectile is in fact proportional to mass times the square of the velocity, and not as IPSC measures it, simply the mass times velocity.
This leads to a system that disproportionally favours heavy bullets, and (to cut what is becoming a long story short) could lead those using say 40's, or 9mm's in open class, to push what could be already, in true power terms, comparible to the 45, past sensible limits.
In conclusion, is there any feeling out there in favour of a muzzle-energy based
power factor: A true power factor?
<font color=red>T.S.</font>
[This message has been edited by The Scandinavian (edited 01-15-99).]
I was wondering about using a true 'power' based measurement rather than the current momentum based calulation. At present, the awesome .224 BOZ (say 50gr @ 2000fps) doesn't even make 'minor', but a bowling ball only has to be rolling slightly across the floor to make 'major' easily. So there: A projectile that's too low pf to make minor will penetrate all kinds of armour, and still be lethal, and yet another projectile with a massive pf won't even bruise your foot if it hits you.
So much for IPSC Power factor then.
On a more practical level of course it means that you can have 40 loads that don't make major and yet have way more true power (measured say in Ft.Lbs) than some 45 loads that make major easily.
The reason for this apparent discrepancy is that the kinetic (movement) energy of a projectile is in fact proportional to mass times the square of the velocity, and not as IPSC measures it, simply the mass times velocity.
This leads to a system that disproportionally favours heavy bullets, and (to cut what is becoming a long story short) could lead those using say 40's, or 9mm's in open class, to push what could be already, in true power terms, comparible to the 45, past sensible limits.
In conclusion, is there any feeling out there in favour of a muzzle-energy based
power factor: A true power factor?
<font color=red>T.S.</font>
[This message has been edited by The Scandinavian (edited 01-15-99).]