Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

My brass lots compared for once-fired, not resized, 2.500"-length (mathematical correction):
W-W Super (post 1996) = 94.9 gr H2O gross
Latest Norma: 99.3 gr H2O = 4.4 grains bigger

94.9/99.3 = 95.57% volume for W-W compared to Norma

PV = nRT

If pressure with W-W = 68,500 psi
then pressure with Norma = 65,465 psi

Changing COL from 3.420" to 3.580" for longest COL with 404-gr Shock Hammer:

Loading 0.160" longer COL adds 6.7 gr H20 to net case capacity.

Norma brass plus 0.160" longer COL will increase net case capacity by 11.1 grains H2O, versus W-W at shorter COL.

Net case capacity with 0.52" seating depth in W-W brass = 73.2 gr H2O at 3.420" COL.
Net case capacity with 0.36" seating depth in Norma brass = 84.3 gr H2O at 3.580" COL.

PV = nRT

(68,500 psi) X (73.2/84.3) = 59,480 psi for my 2612 fps accuracy load in a 24-1/4" Pac-Nor barrel.

That is if Universal Gas Law can be applied like this. Heh-heh-heh.