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Long Range Hunting & Shooting
7mm LRM neck questions
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<blockquote data-quote="zfastmalibu" data-source="post: 1002068" data-attributes="member: 80475"><p>I am just finishing my 7LRM. I bought some brass to measure it up. I found the necks were pretty inconsistent and had a lot of taper. They got thicker the closer you got to the neck. No way I was going to use it un-turned. I turned it to .015 which gave me a 100% clean up on the necks for a .3145 loaded round over the pressure ring. I speced my neck diameter on the reamer at .318. .003 is as tight as I would go and .004-.005 is preferred IMO.</p><p>Also Their throat is way too short. You want to keep the pressure ring of the bullet in the sized part of the neck. To do this with a 180 vld and a 180 hybrid spec your free bore at .150 and at least .2845 on the diameter.</p></blockquote><p></p>
[QUOTE="zfastmalibu, post: 1002068, member: 80475"] I am just finishing my 7LRM. I bought some brass to measure it up. I found the necks were pretty inconsistent and had a lot of taper. They got thicker the closer you got to the neck. No way I was going to use it un-turned. I turned it to .015 which gave me a 100% clean up on the necks for a .3145 loaded round over the pressure ring. I speced my neck diameter on the reamer at .318. .003 is as tight as I would go and .004-.005 is preferred IMO. Also Their throat is way too short. You want to keep the pressure ring of the bullet in the sized part of the neck. To do this with a 180 vld and a 180 hybrid spec your free bore at .150 and at least .2845 on the diameter. [/QUOTE]
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7mm LRM neck questions
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