A .58 conical which you evidently want to use for elk will have plenty of energy, but a very "looping" trajectory which isn't conducive to long range shooting.
You mentioned 200 yds....I'd forget that and concentrate on 100 yds max. The amount of powder for even a 100 yd zero that yields a "practical" mid range mid-range height w/ an average weight conical, would have quite some recoil. If you can tolerate this much recoil, then go for it.
Not trying to talk you out of anything, but have shot a few elk w/ a .54 PRB, some at slightly over 100 yds and have never lost an elk. Even w/ 120 grs 3f, the recoil is moderate.
Personally, I think a .58 conical is "overkill" on an elk and besides it's difficult to achieve a "practical" trajectory at a 100 yd zero that doesn't cause misses or lousy hits at midrange.
Some in our elk hunting party use .50 cal. 410 gr Buffalo Bullets ahead of 100 grs 2f w only/ a 60 yd zero because of excessive mid range height at longer distance zeros.
But, use what you will and good luck on elk.....Fred