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Long Range Hunting & Shooting
Chrome-moly vs. Stainless
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<blockquote data-quote="James Jones" data-source="post: 184480" data-attributes="member: 8843"><p>Chrome-moly is stronger in both yield strength and hardness which is why its a better material to build high pressure action on like the 338 Lapua case on a Rem 700 action. The 400 (416) series SS commonly known as ordnance grade , is what barrels are made from , while its softer and has a little lower yield strength it allows for a better internal finish and is less affected by the high pressure corrosive/errosive effects that take place in the first few inches after the chamber so they are said to last longer before needing to be set back or replaced.</p><p>Now , if you are going to find yourself hunting is say the extreme artic climate where the high temps are well below zero you DON NOT want a stainless steel barrel as the SS will shrink more than the CM will and that will make for a tight bore situation , remember that .001" is a equlivlent to a mile in highend machining such as barrel bores.</p><p> </p><p>all the 400 series Stainless Steels can be heat treaded to increase its strength and hardness but you have to keep it soft enough to be tough so that it doesen't fracture. Stainless machines very nice because its soft and it doesen't work harden nearly as fast so it you get a tool that rubs a bit you won't end up with a hard spot.</p><p> </p><p>Idealy if you could make a barrel out of 718 Inconel you would be set as its the best material for high heat high corosion application but the cost is off the chart just a baller blank before amching would cost you $500+ and having sombody machine it for you would likely cost 5x's that due to its poor machinability. a few barrel makers have tinkered with differant materials , Blackstar had their barrel made from 17-4 Stainless which is very strong tough and corosion resistant but its also alot harder to machine and material cost is more , Lothar Walther uses a steel that they have a patten on that is very similer to 17-4. barrel makers have tried to find differant materials differant grades and so on and they keep comming back to 416</p><p> </p><p>So aside for all the technical BS above look at what the guys that shoot for a living are using , the vast majority are using SS as it last longer. Accuracy wise I'd be willing to bet alot that you can't find a CM barrels that shoot as well as SS barrels , they just won't do it for as long.</p></blockquote><p></p>
[QUOTE="James Jones, post: 184480, member: 8843"] Chrome-moly is stronger in both yield strength and hardness which is why its a better material to build high pressure action on like the 338 Lapua case on a Rem 700 action. The 400 (416) series SS commonly known as ordnance grade , is what barrels are made from , while its softer and has a little lower yield strength it allows for a better internal finish and is less affected by the high pressure corrosive/errosive effects that take place in the first few inches after the chamber so they are said to last longer before needing to be set back or replaced. Now , if you are going to find yourself hunting is say the extreme artic climate where the high temps are well below zero you DON NOT want a stainless steel barrel as the SS will shrink more than the CM will and that will make for a tight bore situation , remember that .001" is a equlivlent to a mile in highend machining such as barrel bores. all the 400 series Stainless Steels can be heat treaded to increase its strength and hardness but you have to keep it soft enough to be tough so that it doesen't fracture. Stainless machines very nice because its soft and it doesen't work harden nearly as fast so it you get a tool that rubs a bit you won't end up with a hard spot. Idealy if you could make a barrel out of 718 Inconel you would be set as its the best material for high heat high corosion application but the cost is off the chart just a baller blank before amching would cost you $500+ and having sombody machine it for you would likely cost 5x's that due to its poor machinability. a few barrel makers have tinkered with differant materials , Blackstar had their barrel made from 17-4 Stainless which is very strong tough and corosion resistant but its also alot harder to machine and material cost is more , Lothar Walther uses a steel that they have a patten on that is very similer to 17-4. barrel makers have tried to find differant materials differant grades and so on and they keep comming back to 416 So aside for all the technical BS above look at what the guys that shoot for a living are using , the vast majority are using SS as it last longer. Accuracy wise I'd be willing to bet alot that you can't find a CM barrels that shoot as well as SS barrels , they just won't do it for as long. [/QUOTE]
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