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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
17-4 PH Stainless cut rifled barrels
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<blockquote data-quote="sirrocco" data-source="post: 452643" data-attributes="member: 6384"><p>Well thats the idea of using 17-4 Ph, it is significantly more corrosion resistant than 416. In addition to the superior corrosion resistance it is approx 50% stronger than 416 and doesn't have the cold temperature failure issues that 416 has. Krieger for example will not sell a stainless tube in less than a #5 contour for this reason. Lothar Walther barrels use a material that is similar / same and I have had a giood run with those previously but they are button rifles and cannot have gain twist rifling.......... Which brings me to the next point. It makes more sense to have the rifling start almost straight and then progressively sped up to the ultimate twist rate. So for example a 30 cal tube would start out at twist rate of 1-100" and progressively get faster till it ends up in a 1-10" twist. The pressure peak resultant from the bullet being wedged into rifling that is say at 36 degrees (over the first inch) as opposed to being virtually straight in front of the throat should provide significantly less peak pressure and a smoother transition for the bullet. </p><p> </p><p>Anyway, it should be interesting and fun to see how it all pans out. It will be interesting if nothing else.....</p></blockquote><p></p>
[QUOTE="sirrocco, post: 452643, member: 6384"] Well thats the idea of using 17-4 Ph, it is significantly more corrosion resistant than 416. In addition to the superior corrosion resistance it is approx 50% stronger than 416 and doesn't have the cold temperature failure issues that 416 has. Krieger for example will not sell a stainless tube in less than a #5 contour for this reason. Lothar Walther barrels use a material that is similar / same and I have had a giood run with those previously but they are button rifles and cannot have gain twist rifling.......... Which brings me to the next point. It makes more sense to have the rifling start almost straight and then progressively sped up to the ultimate twist rate. So for example a 30 cal tube would start out at twist rate of 1-100" and progressively get faster till it ends up in a 1-10" twist. The pressure peak resultant from the bullet being wedged into rifling that is say at 36 degrees (over the first inch) as opposed to being virtually straight in front of the throat should provide significantly less peak pressure and a smoother transition for the bullet. Anyway, it should be interesting and fun to see how it all pans out. It will be interesting if nothing else..... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
17-4 PH Stainless cut rifled barrels
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