.300 win mag .339 neck?

[Raythemanroe]

My gun is headed out to the Smith Friday and the Smith said he has a semi tight chamber reamer (.339) and I have never used a tight neck chamber before..I was wondering the benefits there is for a tight neck and problems that are associated with it? What would the preferred O.D. be on a loaded round(.336)? How much clearance should I have?

 

[holl]

what are you using the rifle for? target? hunting? benchrest? what brass and bullets do you want to use?

 

[Raythemanroe]

I have only been able to find Winchester brass and plan on shooting some in Williamsport, PA.. I am looking at 190-210g bullets and have been thinking of trying Berger 200g Hybrid..

 

[Scott Harris]

I'd suggest at least .006" clearance for that cartridge: .003 per side. Tight neck and 300 WIN MAG makes no sense to me.

 

[Raythemanroe]

Well, here is my opinion on the 300 wm the od is .339 and .308 win is .338 right? I was thinking by the time I clean up my brass with a turner it would be just right! But if .006 is the tolerance most think is needed then I may have to remove more then I thought.

 

[MarioM]

I have had couple of different necks on .300 win mags I havent seen alot of gain or loss I have had a .340 and .342 both were very accurate rifles. I have a .308 with a .336 neck and its just a pain in the butt I either have to neck turn or run winchester brass.

 

[Raythemanroe]

MarioM, What would be a perfect medium? .340?

 

[MarioM]

.340 is always a good neck diameter I think

 

[jsthntn247]

My 300 has a .339 neck. I've shot RWS, win, and Norma brass with no issues. Loaded rounds measure .335.

 

[Raythemanroe]

 

[Steve Blair]

I use .004-.005" clearance for .300 WSM. Your WM should be fine with that.

 

[500 meter ram]

speaking of 300 win mag...I just finished building mine and can't find brass anywhere. Anyone out there that can point me to a source?