This is addressed to anybody that is either handloading the promising 7mm Long Range Magnum or to somebody that has more expertise than I. I am seriously considering building one of these and am doing my "due diligence."
The information on the 7mm LRM shows a neck OD of .318" which makes the neck wall thickness .017". I saw one poster mention someplace that the process from the parent 375 Ruger would require neck turning, but that is the only mention of neck turning I have seen. It's a pretty long trip from .375" to .284" and that brass has to go someplace.
Don't misunderstand; I'm not trying to avoid neck turning. In fact I was already thinking that .017" was rather thick. I thought .014 - .015 might be better. The reamer that Gunwerks provides creates a neck diameter of .321" and turning the neck to .015 thickness would increase the neck-to-chamber diameter gap from .003" to .007". If the brass that Gunwerks sells already has been turned and is concentric, that's one thing; but if it needs to be turned then I'm wondering how much neck clearance is considered ideal for what basically is a custom rifle?
So, my questions for anybody that has purchased the 7mm LRM brass (or ammo) are: How are the necks? Have they been turned? Are they equal thickness? Have you measured neck diameter before and after firing?
And for anybody with custom rifle experience, what is the sweet spot for neck clearance for a custom gun of this caliber? I know that mass produced guns run fairly large tolerances to accommodate any factory ammo.
If this resized brass needs to have neck turning to a large enough degree to make the .321" chamber too sloppy, I will either obtain a more optimal version of this reamer or go with something else.
If this resized brass has thick but uniform (turned) necks, I'll experiment with leaving the .003" as is and doing a little turning and comparing .004", .005"
Appreciate any guidance.
rg
The information on the 7mm LRM shows a neck OD of .318" which makes the neck wall thickness .017". I saw one poster mention someplace that the process from the parent 375 Ruger would require neck turning, but that is the only mention of neck turning I have seen. It's a pretty long trip from .375" to .284" and that brass has to go someplace.
Don't misunderstand; I'm not trying to avoid neck turning. In fact I was already thinking that .017" was rather thick. I thought .014 - .015 might be better. The reamer that Gunwerks provides creates a neck diameter of .321" and turning the neck to .015 thickness would increase the neck-to-chamber diameter gap from .003" to .007". If the brass that Gunwerks sells already has been turned and is concentric, that's one thing; but if it needs to be turned then I'm wondering how much neck clearance is considered ideal for what basically is a custom rifle?
So, my questions for anybody that has purchased the 7mm LRM brass (or ammo) are: How are the necks? Have they been turned? Are they equal thickness? Have you measured neck diameter before and after firing?
And for anybody with custom rifle experience, what is the sweet spot for neck clearance for a custom gun of this caliber? I know that mass produced guns run fairly large tolerances to accommodate any factory ammo.
If this resized brass needs to have neck turning to a large enough degree to make the .321" chamber too sloppy, I will either obtain a more optimal version of this reamer or go with something else.
If this resized brass has thick but uniform (turned) necks, I'll experiment with leaving the .003" as is and doing a little turning and comparing .004", .005"
Appreciate any guidance.
rg
