IMO, with heavy recoiling rifles it is a good idea to crimp into the bullet's crimp groove. It has been obvious to me for a long time that many of the 458 bullets, especially older ones from US manufacturers, were designed to maximize the already limited capacity in the 458 Win Mag. The opposite may be said for some of the "450 Nitro" 458 bullets. It's possible also that the longer throat in a standard 458 Win Mag chamber was purposeful to accommodate the longer nose in front of the crimp groove particularly in the 500 and 510 gr bullets.
The correlation between bullet weight and usable case capacity is a little tricker than: less weight = more capacity if crimp groove is used as it should.
Pic left to right is:
480 gr Hornady DGX, 480 gr 450 Nitro Woodleigh RNSN, 510 gr Winchester Soft Nose
