Sir John,
Buy a donkey for your positive opinion on whether Bubba's Ballpoint Hammer Shock bullet will expand.
Though I do understand the concern of Sir Dennis, maybe the final refinement will be best.
I take a .460" diameter nitro card wad from Circle Fly and punch a 0.250" diameter wad out of its center,
drop the bead in, then push in the snug fitting little card, and seat the steel ball bearing atop the HP.
Same beautiful contour and BOL as the double steel ball.
The plastic bead is easily crushed when the steel ball rams home, should encourage expansion.
Seating a second steel ball after the first one may not be as securely gripping on the exposed ball. Sloppy seconds !
Plus, two steel balls are too heavy. Might as well use a 450-gr TSX !

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Just another bullet for the 400-grainer shootoff, to see what happens to 400-grainer velocity when the bullet weight is increased by 23 grains,
all with same powder charge: 80 grains of AA-2230.

The Maytag Repair Man moonlighting at Winchester:

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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.