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
In 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.
Posts: 694 | Location: JOHANNESBURG, SOUTH AFRICA | Registered: 17 January 2013
If 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.
Jim "Life's hard; it's harder if you're stupid" John Wayne
Posts: 4954 | Location: Central Texas | Registered: 15 September 2007
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.
Posts: 1421 | Location: WA St, USA | Registered: 28 August 2016
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.
Posts: 4748 | Location: TX | Registered: 01 April 2005
