well the rifling engraving that bullet (posted above) seems to indicate it was fired, but the lack of ANY obvious impact distortion or expansion would leave me too conclude it failed to expand on impact, thus Id be looking too avoid using anything similar in design or that brand of projectile in the future on elk in any 340 wby I owned.
Ive used the cast 350 and cast 405 weight bullets and the 405 jacketed remingtons on both deer and elk in the past, and while If yet to have a Dead on impact shot with a 45/70 I,ve also never had one go very far either