Thread: Resizing .375 cal projectiles to 9.3mm

Based on reading rather than my own results sizing down can leave the core a little loose in the jacket due to spring back of the jacket being greater. Bumping up from .358 may give a better result but the kit would be a lot more expensive. The Speer Hot Core and more especially the plated Gold Dot projectiles and their kin may give better results in sizing down for this reason due to their manufacture.
A better idea would be to just buy the right calibre projectiles in the first place even if you have to order them.
GPM.