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Joined: Jun 2001
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MAC Offline OP
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I am having a Rem Model 700 300 H&H barrel delivered to replace the barrel on a Model 700 in 7mm Mag. Finding 300 H&H brass is a little difficult but I have several hundred once fired cases in 375 H&H. Since both rounds are based on the same case I am considering necking down some 375 H&H brass to 300 H&H brass. I plan on doing it in 3 stages: Full length size and deprime the 375 cases. Run the cases through a 300 H&H die without the decapping pin and then running the cases through a 300 H&H die with the decapping pin in place. Then check neck thickness and length and trim accordingly and fire form the cases.

In my mind this should work. What are Y'All's thoughts? Doable with normal dies? Or should I have RCBS make me a sizing die from 375-300? Not sure that would be needed. I am curious if anyone has done this and if they ran into any issues.


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Joined: Jul 2004
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You better anneal it all first as you will mess a bunch of it up without softening it first.


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Joined: May 2014
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Should work - Annealing is wise


I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally

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