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Pressure Difference : 45acp Jacketed vs. Plated ?
geo57
Member Posts: 13 ✭✭
I've read this debate go both ways & I'm hoping someone truely " in the know " can settle this. If you have 2 cartridges , in this case, a .45 acp with a 230 gr. Win. FMJ bullet and a .45acp with a 230 gr. Berry's plated round nose bullet, both atop the same 6 gr. Unique charge, which will create more chamber pressure ( & likely more felt recoil ) given ALL other factors for the 2 loads are exactly the same besides the projectiles, and both fired in the same pistol ? Thanks
Comments
Both ways of the argument as stated above are both wrong.
In response to your hypothetical question, the answer is there will be no difference whatsoever in the recoil between the two loads because chamber pressure is not a factor relating to recoil.
According to Newtonian physics the variables that determine the recoil of a gun are as follows:
Free Recoil Energy = 0.5*(Wg/32.2)*((Wb*Vb+Vg*Wc)/(7000*Wg))^2
Where:
Wg=Weight of gun, pounds
Wb=Weight of projectile, grains
Vb=Velocity of projectile, feet/second
Vg=Velocity of gas, feet/second
Wc=Weight of powder charge, grains
Therefore, if you wish to reduce recoil as outlined in the above case it will require that either a heavier pistol is used, the bullet weight is reduced, or the velocity of the bullet is reduced.
Unless you want to change pistols your best bet is to reduce the weight of the bullet and the powder charge. Yes, there are always trade-offs.
Because of variations in individual barrels and bullet diameters, etc. it would be basically impossible to predict which load would produce a higher chamber pressure.
Regards,
Heavyiron