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The .300 Whisper is normally a .308 bullet. The 7.62 x 39 is .311. Some slop there.
The .357 bullets should expand enough to lose most of their velocity and energy in the bad guy. (9mm is .355, btw).
I would start with a high grade rifle. That way a new barrel, etc., wouldn't look out of place. Heck, the 7.62 x 39 moving that weight of bullet (125-200 grains) could make it a subsonic.
As for expanding the case neck, I have a .35 Whelen which is an '06 expanded to .357. Not much shoulder, but enough to headspace on. No problems with brass thickness in the neck.
The .357 bullets should expand enough to lose most of their velocity and energy in the bad guy. (9mm is .355, btw).
I would start with a high grade rifle. That way a new barrel, etc., wouldn't look out of place. Heck, the 7.62 x 39 moving that weight of bullet (125-200 grains) could make it a subsonic.
As for expanding the case neck, I have a .35 Whelen which is an '06 expanded to .357. Not much shoulder, but enough to headspace on. No problems with brass thickness in the neck.
