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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm WSM long throating
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<blockquote data-quote="KsKevin" data-source="post: 3042651" data-attributes="member: 116689"><p>Given the 195g LRHT bearing surface is 0.063" longer than the 180VLDH, to keep the start of the boat tail at the same point relative to the base of the shoulder vs the 180vld with a 0.190" FB it would require the FB for the 195g to be 0.253". Seems like a lot to me especially given the 7PRC which is really optimized for the 180/195g class bullets has a 0.233" FB. Some simple calculations given the brass dimensions will get you close but I'd go the route of doing as others have suggested with creating a dummy round. The art is trying to get the base of the boat tail above the neck shoulder junction while still allowing enough neck engagement on the bullet and room to chase the lands. The neck on the 7WSM is pretty short only being 0.244" vs some other 7mm cartridges which are more in the 0.310" range allow more neck engagement and margin for error.</p></blockquote><p></p>
[QUOTE="KsKevin, post: 3042651, member: 116689"] Given the 195g LRHT bearing surface is 0.063" longer than the 180VLDH, to keep the start of the boat tail at the same point relative to the base of the shoulder vs the 180vld with a 0.190" FB it would require the FB for the 195g to be 0.253". Seems like a lot to me especially given the 7PRC which is really optimized for the 180/195g class bullets has a 0.233" FB. Some simple calculations given the brass dimensions will get you close but I'd go the route of doing as others have suggested with creating a dummy round. The art is trying to get the base of the boat tail above the neck shoulder junction while still allowing enough neck engagement on the bullet and room to chase the lands. The neck on the 7WSM is pretty short only being 0.244" vs some other 7mm cartridges which are more in the 0.310" range allow more neck engagement and margin for error. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm WSM long throating
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