elkaholic
Well-Known Member
Which neck sizer would you guys use to size a 375 Ruger down to .338? The purpose would be to step the 375 case down to .338 on my way to a 30/375....rich
i use the 338 rcm and 300rcm to step down to 7mm 375 the other option might be the 7lrm brass from gunwerks you would just need to step up to 30cal. hornady may also have brass too. we had a guy come hunt this year that has a 30 375 he got though there 1000 brench rest program sorry cant remembered what he called it and his brass was head stamped for the caliber.
Which neck sizer would you guys use to size a 375 Ruger down to .338? The purpose would be to step the 375 case down to .338 on my way to a 30/375....rich
Hey elkaholic
I was told by Hornady that a neck sizer for taking down the 375 neck down to 338 would not work, you have to use a FULL LENGTH 338 die. The reason was because the neck sizer would catch the case mouth and crush the case while the full length die had a more gradual forcing cone and would work.
I can speak from experience that the 338RCM Full Length die will take the neck down without crushing the case and then the 300RCM Neck sizer will take it down to 30 caliber.
But you might get a 338 neck sizer to work, I followed their advice and got the dies mentioned above
Why not buy one Redding neck bushing die and 3 bushings to do it in steps? This is how I do the 7mm - 300 win and it works golden with little runout induced.
Jeff
Thanks for all the input guys! What I have done is buy a full length 375 Ruger die to first push the shoulder back about .070", then use a 338 RCM die to neck down the first step. The third step would be either use my 30/375 S.I. die to create the 40 degree shoulder or maybe better yet, just fire form at this point since I have to blow the taper out a little anyway.I can use my bullet swaging press for any and all steps, so horsepower is not an issue......Rich
Let us know how this works when you receive the dies and brass and start forming cases? I'm interested in knowing how much force is required to set the shoulder back and whether this becomes a big deal or not.
This is what I experienced when I attempted to neck down from 300 RUM to 257 RUM in a single step. I needed a 7mm WSM or 7mm RUM full length die but must not have had one on hand. So I got impatient and tested my luck going straight down to 257. The shoulder on this casing was screaming out in pain just before collapsing!