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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
50 Allen Tactical, more work to report....
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<blockquote data-quote="Black Diamond 408" data-source="post: 132153" data-attributes="member: 1563"><p>Kirby,</p><p> Yes i use 1.350 4140 bbls, 1.400 on stainless.</p><p>Stainless is not as strong as 4140. I only used one 1.350 stainless bbl, it is on the first proto type rifle i built in 2002, i use it as a test rifle only.</p><p> Being a custom rifle manufacturer i have to err on the side of caution. The size of the case vs the bbl shank, and total chamber pressures, a larger shank is more stable. I'm not saying a 1.350" stainless bbl is not safe. The added .050 material don't amount to too much extra weight. It adds chamber area stability. This is why you need larger bbl tennons as well. The 408C-T case is a whole new ballgame, special designed for high pressures and large bullets. There is a lot of thrust on the locking lugs and abutments, some of the early actions that were made for the 408 in testing were having problems with "lug set back" from the high chamber pressure and small dia lugs. 1 3/16" x 16 tpi threads seem to be the perfect size for the 408 based cases.</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="Black Diamond 408, post: 132153, member: 1563"] Kirby, Yes i use 1.350 4140 bbls, 1.400 on stainless. Stainless is not as strong as 4140. I only used one 1.350 stainless bbl, it is on the first proto type rifle i built in 2002, i use it as a test rifle only. Being a custom rifle manufacturer i have to err on the side of caution. The size of the case vs the bbl shank, and total chamber pressures, a larger shank is more stable. I'm not saying a 1.350" stainless bbl is not safe. The added .050 material don't amount to too much extra weight. It adds chamber area stability. This is why you need larger bbl tennons as well. The 408C-T case is a whole new ballgame, special designed for high pressures and large bullets. There is a lot of thrust on the locking lugs and abutments, some of the early actions that were made for the 408 in testing were having problems with "lug set back" from the high chamber pressure and small dia lugs. 1 3/16" x 16 tpi threads seem to be the perfect size for the 408 based cases. Dave [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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50 Allen Tactical, more work to report....
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