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

Previous flirtation with 72.0 grains of AA-2460s and deeper seating
proved to be of too high velocity for the two "46-485" bullets from Accurate Molds.
They exceeded the 2200 fps maximum for Nitro Express Modus Operandi.
So next, the load is decreased to 70.0 grains, and seating depth is decreased to 0.355" for both.
Now they both have air space in their cases, identical LR/net fill of about 93%.
That is a 478-grainer at 3.340" COL, quite lovely,
and the 491-grainer at 3.480" COL, a wicked witch of a bullet.
This requires just a taper crimp and no roll crimp into the full diameter bullet,
right in the middle of bearing band.
Both are hard alloy, BHN25, Eastwood Ford Light Blue PC paint, and have gas checks.





One often sees a little "s" tacked onto the "AA-2460s" name, and not the "AA-2230."
I finally figured this must be code for AA-2460s having all spherical grains of the same stuff that is in AA-2230.
AA-2230 has about half of its grains squashed flat to make it pack into a smaller space and burn a little faster.
I am going to try to remember to type the little "s" henceforth: AA-2460s