For lighter calibers to penetrate they need a higher Sectional Density. Typically for elk a sectional density of at least .275 is recommended. If its difficult to find that, or "close enough"... in your caliber avoid the quartering shots where penetration is more critical.Thanks. So to clarify this, which bullets do and do not "have the integrity to penetrate heavy bone without fragmentation, major weight loss, or deformation" in elk in your view? I think that is where the disagreement with the Philosophy 2 crowd might be, though I'm not sure.
Maybe look for "long for caliber" bullets like a monolithic...