Resizing 30-30 Win to 375 Super Mag

[Texas4x4hoe]

I haven't been into reloading for a very long time, I load 45acp, .223, 7mm rem mag, and 22-250. I've not ever resized brass for a different caliber and was wondering if anyone could inform me on necking the 30-30 to 375. I've found a bunch of references to using 30-30 brass for 375 winchester or 375 Super Mag(shortened 375 win) but no info on how to do it. Any info would be appreciated.

 

[Swampman]

I don't own a .375 SM myself, but I knew a guy a few years back that did. This is all "second hand memory", so please don't take it as Gospel.
I think that he had a special die that he used to neck the 30-30 cases up before fire forming, but I don't know who made the die or where he got it.
I remember that he preferred cutting down .375 Winchester brass when it was available, he said it was much easier and the brass lasted longer. If I recall correctly, the 30-30 cases were too thin after necking up and didn't give as good a crimp, they also tended to split quickly, even when annealed.

 

[NCsmitty]

375 Winchester brass is heavier/stronger than standard 30-30 brass, to handle the slightly higher pressures of the 375. Necked 30-30 brass won't stand up to 375 pressures for too long.
As noted, split necks happen quickly.


NCsmitty