The 9.3x57 is a balistic clone of the .358 Win. for all practical purposes and there is nothing wrong with that, It's a fine caliber..
I, personally prefer the added velocity of the 9.3x62 and a conversion runs about $50.00 around here..some do it by hand in a vise..
In my 26 inch tube, long throated Brno mod 21 Mauser with RL-15 I can get 2553 FPS with a 286 gr. Nosler, almost 2700 FPS with a 250 Barnes or a GS Customs monolithic, and 2400 FPS is a snap with the 320 gr. Woodleigh..Also the 300 gr. Swift might be a real good balanced killer at 2450 FPS..These are my established loads that I have been using for years..They are max but have never given me any problems in any kind of inclement weather.. I use RL-15 and H414 and brass lasts reasonably well at 9 or 10 loadings and 2 trims.
If I want a 9.3x57 I put less powder in the 9.3x62 case...Same with the 338 Win over the 338-06..I put less powder to duplicate the 338-06..It won't work the other way around..
Just an opinnion and an option for consideration, not saying its for everyone out there, just another point of view....
