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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chromoly or Stainless?
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<blockquote data-quote="shortgrass" data-source="post: 1797463" data-attributes="member: 24284"><p>Not just that ^^^^^^^, the 300 series is not heat treatable, as you mentioned. 17-4PH can be machined with HS tooling, but it is tough enough that carbide really works best and has some tool life. I made some muzzle brakes using 17-4PH. I could drill with a 135* split point HS, screw machine length bit, but my center drill was carbide as were all of the milling cutters. All work done under flood coolant. As for barrel materials, A CM can be the equal of a 416R SS as long as the same care in manufacture is used for both. I chamber at a slower RPM and feed when cutting CM , even though I'm running a muzzle flush system on my chambering lathe. Nitirdied CM comes back "as hard as the hubs", slick and as weather-proof as any other mentioned coating.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1797463, member: 24284"] Not just that ^^^^^^^, the 300 series is not heat treatable, as you mentioned. 17-4PH can be machined with HS tooling, but it is tough enough that carbide really works best and has some tool life. I made some muzzle brakes using 17-4PH. I could drill with a 135* split point HS, screw machine length bit, but my center drill was carbide as were all of the milling cutters. All work done under flood coolant. As for barrel materials, A CM can be the equal of a 416R SS as long as the same care in manufacture is used for both. I chamber at a slower RPM and feed when cutting CM , even though I'm running a muzzle flush system on my chambering lathe. Nitirdied CM comes back "as hard as the hubs", slick and as weather-proof as any other mentioned coating. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Chromoly or Stainless?
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