An RCM case should as well. Anything with '06 capacity should do it, albeit not with large case/low pressures of the 450/400, hence our use of slow (for bore/case size) powders in the Whelen.
Yes, the Whelen needs necked up to 416, re-sized and fireformed. The beauty is that 41 cal. pistol bullets do this economically.
Close to 400 rounds already, no headspace problems. We even tried making it fail by firing with straight cylindrical cases. Not even a hitch. It is a highly unsung round.
3sixbits, Have you any sources that have had headspace issues? I have heard this too but have never even had any trouble whatsoever, nor have I heard of documentated cases.
Ken Howell here has stated that it was never an issue and he himself developed a rifle cartridge that headspaced off of the mouth.
Most 400 Whelen dies are designed in such fashion that the shoulder cannot be pushed back.
Last edited by HawkI; 01/12/09.
