Then forget the fire-forming mumbo-jumbo. 5 loads from 60.0 to 68.0 grains with 68.0 grains being a full case, non-compressed load, noted as maximum. The velocities are ballpark anyway for anyone with a different rifle, and are not much different from fire-forming to formed-case firing, in the .400 Whelen-Petrov case, another weak pun intended.
If anything, that would be a safety margin with the use of fire-formed brass for assembling the real-deal, hunting ammo. I SWAG your 68-grain load is less than 60,000 psi.
Looks like the slower burning, heavier-charged, more compact CFE-223 ball powder gives the faster burning, lighter-charged, bulkier H4895 a run for the money.
Which of the two powders is more temperature independent is a possible bonus for H4895.
BTW my "proof-of-goof" load was with compressed H4895, 67.0 grains, only about 107% LR/net fill compressed without drop tube use, in that cartridge so similar to the .400 Whelen-Petrov. DON"T TRY THAT AT HOME WITHOUT ADULT SUPERVISION.
Will report back here when I get the CFE-223 loads posted at ammoguide.com.
Great, Thank you Sir Ron, BTW, Swift does make a .410" 400gr Aframe, i used that bullet in my 400 H&H at 2400 fps Sept/Oct-2020 in Tanzania to take:
Leopard, 70 yards, out of blind. Warthog, 169 yards off sticks. Hartebeest, 221 yards, prone. Waterbuck, 228 yards off sticks. Zebra, 277 yards, prone.
These 40's are great rifles too.
Those that worry about long bullets in the 400 Whelen, fear not, the 400gr Woodleigh solid is 1.412 long, my rifle with standard Petrov chamber will take that bullet at a COL of 3.325" long, may even go 3.340", never let it out that much, meaning any spitzer shaped bullet should run fine at max mag box length of 3.340"
Another reason i have no fear using the 416 cal 400gr partitions after Sir Ron draws em down for me, that bullet at 416 dia is 1.485 long, no problem, the .411" 400gr A-Frame is 1.405 inch, the .411" 300gr Barnes TSX is 1.290 inch, let er rip men, you have room to work.
