300 h&h to 375 h&h

[Big Dipper]

I would like some 375h&h brass but I don't have any. I can trade for some 300 h&h brass this Thursday. Can i form 375 h&h from 300 h&h?

[Lloyd Smale]

yup. just neck it up or fire form it. If you decide to pass on the 300 let me know as i couldnt use a bit more 300 brass.

[Big Dipper]

Thank you for the reply. I have only made 7x30 Waters from 30-30 and 257 AI from 7x57. I did not know if going up from 30 cal to 375 cal would thin the necks to much or shorten the neck. A guy in the next town has 300 h&h and is looking for 308. I will be over there tomorrow.

[TheDoctor]

per my cartridge conversion manual:

MAKE FROM: Factory or .300 H&H. Anneal case neck.
Taper expand neck (in several steps!) to about .380" I.D. F/L
size and fireform for final shape.