06 October 2016, 16:35
Hoytshooter308 Norma mag
Last week while sitting around the fire in south Africa one of the hunters was talking about building a .375 off the 308 Norma mag. Reason being he has a large supply of
of brass. Is there a common wildcat for this combination. Thanks
06 October 2016, 21:07
ramrod340Don't know of one. Since the Norma is so close to the 338Wmag brass would be basically a.375 Taylor.
06 October 2016, 23:30
AFRICAN LEADWOODIn SA the cost.of building a rifle is far higher than the cost of brass. Do whatever blows your hair back and justify it how you want but that makes very little sense over here.
07 October 2016, 00:17
HoytshooterWe both live in the US it was a topic of conversation that I wanted to look into. Thanks for the responses so far. P
07 October 2016, 06:32
capowardIf I recollect correctly the 308 Norma had about a 1.5gr powder advantage over the 30/338 WinMag. I would expect about the same advantage for a .375/308 Norma vs the .375 Taylor. Regardless, Taylor loadings would be a good starting point.
07 October 2016, 06:58
ramrod340While you should be able to use the load data. The extra capacity I believe was from a longer neck. At same oal they are basically the same.
08 October 2016, 09:11
Ray BThe shoulder of the Norma is slightly longer than the Win mag, so you'd have two options: 1. chamber the rifle for 375/338, then expand the necks of the 308 Norma to 375, then full length resize the case to set the shoulder back, then trim to length; or 2. chamber rifle to 375/308 Norma and expand the neck to 375. In either case expanding the necks from 308 to 375 needs to be done cautiously, particularly if fired more than once, to avoid splitting. loading data for either would be within the parameters of the 375/338 and would need to be done with starting loads, etc. I suspect resale would be higher if chambered to 375/338.
08 October 2016, 09:38
Doublessquote:
Originally posted by Ray B:
The shoulder of the Norma is slightly longer than the Win mag, so you'd have two options: 1. chamber the rifle for 375/338, then expand the necks of the 308 Norma to 375, then full length resize the case to set the shoulder back, then trim to length; or 2. chamber rifle to 375/308 Norma and expand the neck to 375. In either case expanding the necks from 308 to 375 needs to be done cautiously, particularly if fired more than once, to avoid splitting. loading data for either would be within the parameters of the 375/338 and would need to be done with starting loads, etc. I suspect resale would be higher if chambered to 375/338.
FWIW, Hornady will supply sizing spindles that will allow the brass to be necked up in successive steps to preclude split necks.
I have been working with the 6.5 Grendel necked up to 35 caliber for about two years now. Hornady supplied elliptical expanders and a threaded spindle that allowed me to expand all the way up from .254 ID to ..358 ID (new brass) while never losing a single case.
