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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New .338 lanches a 300gr Sierra MK at 3500fps?
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<blockquote data-quote="Steve Shelp" data-source="post: 21906" data-attributes="member: 22"><p>Brent,</p><p> Just a FYI to you. With a .577 diameter at the shoulder yes you will gain case capacity but that is really shallow taper and could cause extraction problems even without pressure loads. The rule of thumb that is normally used for minimum taper on a case is .008/in of taper. Anything less then that you normally end up tapping your bolt handle to get cases out of the chamber. If your smith already has the reamer, then I assume he's already chambered up some barrels. Ask him to make sure there are no problems that he is aware. There are no hard and fast rules here, only guidelines, so maybe you'll be ok. </p><p></p><p>Also when you got 134gr of H20 with that case how exactly did you measure it? Just curious. I normally measure the case as fired, with a primer cup upside down, and fill even to the mouth of the case. Just comparing notes really. I've got (2) 338-378 Weatherby cases that I measured and they held 135.? and 136gr of H20 and they aren't improved at all and came out of a tight BR chamber.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 21906, member: 22"] Brent, Just a FYI to you. With a .577 diameter at the shoulder yes you will gain case capacity but that is really shallow taper and could cause extraction problems even without pressure loads. The rule of thumb that is normally used for minimum taper on a case is .008/in of taper. Anything less then that you normally end up tapping your bolt handle to get cases out of the chamber. If your smith already has the reamer, then I assume he's already chambered up some barrels. Ask him to make sure there are no problems that he is aware. There are no hard and fast rules here, only guidelines, so maybe you'll be ok. Also when you got 134gr of H20 with that case how exactly did you measure it? Just curious. I normally measure the case as fired, with a primer cup upside down, and fill even to the mouth of the case. Just comparing notes really. I've got (2) 338-378 Weatherby cases that I measured and they held 135.? and 136gr of H20 and they aren't improved at all and came out of a tight BR chamber. Steve [/QUOTE]
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New .338 lanches a 300gr Sierra MK at 3500fps?
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