The .405 seemed to have worked well on soft-skinned targets, but back in Elmer's day, velocity was the bane of bullets, with no premium examples available.
The .35's 250 grain bullet has a higher sectional density, and with a MV of 2100 or so fps, I can see why it would possibly penetrate better.
Woody, if it stabilizes, that heavy of a bullet ought to penetrate!
