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300 H&H from 375

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28 December 2023, 01:34
willmckee
300 H&H from 375
Anybody formed 300 from 375 and if so how well did it go? I'd assume necks will need turning and possibly annealing as well?

Roger
28 December 2023, 02:37
rcraig
According to Donnelly:

Anneal case neck, FL size in 300 H&H die, square case neck, chamfer.
28 December 2023, 21:43
willmckee
thanks. easy enough. 375 brass I have, and can get more easily.

Roger
29 December 2023, 04:30
Lamar
I'd try without the anneal and just size till they chamber.
30 December 2023, 02:46
willmckee
I've not found annealing case necks all that necessary. I did when forming 357 AMP from 44 but that was a really extreme change.

I would expect some thickening and a need for turning to true up and restore concentricity.

Roger
30 December 2023, 04:20
Hipshoot
.429 (.44) to .358 = .071 difference

.375 to .30 =.067 difference

Not a great difference!

I would anneal!!!


Shuddent Hoit!

Hip
30 December 2023, 17:58
Pancho
I get you have surplus 375 brass but when I was short 300 H&H, I resized 300 Wby. A straightforward process with very little trouble.


Pancho
LTC, USA, RET

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