Originally Posted by jwp475
The faster you push a hard cast the harder it needs to be for top accuracy. I thought that the powered coat might allow you to get away with it but it did not. I believe that at least .460" diameter would also aid accuracy

Agree.
I use a .460" sizer on my PC-painted BHN25 and it comes out 0.461" to stay.
Those always seen to work well in the long throat, .458" or .459" groove,
and the 1:14" twist is not too fast.
My Ruger No. 1 has 0.459" groove and 1:14" twist.

Maybe 1:20" would be better for the ultimate accuracy with hardcast, but 1:14" ain't bad.
And a PC-painted plain base might be as good as a gas check.
I was just getting rid of my leftovers in that last NEMO trial.
Had 16 of the soft PH,
7 of the hardcast AM 46-485N,
10 of the hardcast AM 46-485Z.
All done with leftovers.

Ready to cast hard for the .458 WinMag smokeless loads.

Simple recipe seems to be 70.0 grains AA-2460s for any hardcast 480-500-grainer
Nitro Express Modus Operandi loads: 2150 to 2200 fps in a 24" barrel.

I might be able to grind the 491-grainer down to 480-grains by cutting a cannelure deep enough
into its long full bearing base, for crimping, using the CH4D CannTool on the as-cast before painting, sizing and gas-checking.

[Linked Image]

Weigh the bullet after each crank and grind until it was reduced by 10 grains,
tedious and with lead exposure from biting my fingernails between weighings ... heh-heh-heh ...
Or just wait for the perfect 480-grainer to come along.

Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.