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Rifles, Reloading, Optics, Equipment
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7LRM (Long Range Magnum) - Pic & Info thread
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<blockquote data-quote="Swamplife" data-source="post: 1099333" data-attributes="member: 35976"><p>Rockfish Dave wrote: How much free bore would you recon?</p><p>I personally would like to run 140gr - 180gr. </p><p></p><p></p><p></p><p></p><p>Hello LRM Shooters</p><p></p><p></p><p>I'm using a JGS reamer spec'ed at .318 neck and .150 freebore. I have to skim turn my necks to .016 and the COAL to the lands with a 180 hybrid is 3.555. I'm a little long in anticipation of the 195's. But if the heaviest you want to run is 180's, the least freebore I would run is .120. I had the original Gunwerks reamer and according to my measurements it had like .069 freebore which was too short IMO. The original reamer had a tighter neck and later lots of brass had thicker necks causing excessive pressure. Gunwerks redesigned their reamer to accommodate the thicker necks but I don't know if the freebore was changed or not. Rather than change to the revised Gunwerks reamer I decided to just go with a reamer that required neck turning and throated to my liking. Anybody who is going to neck turn and weight sort. Turn all your necks first then sort them, it does matter. With a load of 73grs of H1000 and 180 hybrids jumping .010 with sorted brass within 1gr and .001 runout measured on my NECO. It will shoot .9 @ 300yds. Velocity on my crony is 3050fps but if you calculate by drop it's 3125fps.</p><p></p><p></p><p></p><p>Darren</p></blockquote><p></p>
[QUOTE="Swamplife, post: 1099333, member: 35976"] Rockfish Dave wrote: How much free bore would you recon? I personally would like to run 140gr - 180gr. Hello LRM Shooters I'm using a JGS reamer spec'ed at .318 neck and .150 freebore. I have to skim turn my necks to .016 and the COAL to the lands with a 180 hybrid is 3.555. I'm a little long in anticipation of the 195's. But if the heaviest you want to run is 180's, the least freebore I would run is .120. I had the original Gunwerks reamer and according to my measurements it had like .069 freebore which was too short IMO. The original reamer had a tighter neck and later lots of brass had thicker necks causing excessive pressure. Gunwerks redesigned their reamer to accommodate the thicker necks but I don't know if the freebore was changed or not. Rather than change to the revised Gunwerks reamer I decided to just go with a reamer that required neck turning and throated to my liking. Anybody who is going to neck turn and weight sort. Turn all your necks first then sort them, it does matter. With a load of 73grs of H1000 and 180 hybrids jumping .010 with sorted brass within 1gr and .001 runout measured on my NECO. It will shoot .9 @ 300yds. Velocity on my crony is 3050fps but if you calculate by drop it's 3125fps. Darren [/QUOTE]
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7LRM (Long Range Magnum) - Pic & Info thread
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