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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why No 3R rifling??
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<blockquote data-quote="elkaholic" data-source="post: 506911" data-attributes="member: 13833"><p>I just got off the phone with one of the top barrel makers of 5r rifling and this is what I learned. My feeling about the 3 groovers was that they lasted longer and I didn't see any loss of accuracy so I thought the marriage with the 5r which cleans up better would be a good thing. He says that the reason the 3 groovers appear to last longer is because when you compare them to another button rifled barrel, they probably will. Because the button rifled barrels have displaced metal, they tend to loose larger chunks of material when the throat erodes and the wider lands in the three groove tend to help overcome that so accuracy doesn't suffer as quickly even when the throat is erroded. He says that a cut rifled barrel would not act in the same way because the metal isn't displaced but rather cut out. It never dawned on me until just now, but with that logic, the 3 groove with CUT rifling should then last even longerlightbulb! He did say that the odd number of lands were SOMETIMES an advantage over having the grooves cut directly accross from each other in the jacket as would be the case for a four groove for ex. He also said that he felt the 90 degree rifling was a slight advantage in small caliber bullets especially with short bearing surfaces........Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 506911, member: 13833"] I just got off the phone with one of the top barrel makers of 5r rifling and this is what I learned. My feeling about the 3 groovers was that they lasted longer and I didn't see any loss of accuracy so I thought the marriage with the 5r which cleans up better would be a good thing. He says that the reason the 3 groovers appear to last longer is because when you compare them to another button rifled barrel, they probably will. Because the button rifled barrels have displaced metal, they tend to loose larger chunks of material when the throat erodes and the wider lands in the three groove tend to help overcome that so accuracy doesn't suffer as quickly even when the throat is erroded. He says that a cut rifled barrel would not act in the same way because the metal isn't displaced but rather cut out. It never dawned on me until just now, but with that logic, the 3 groove with CUT rifling should then last even longerlightbulb! He did say that the odd number of lands were SOMETIMES an advantage over having the grooves cut directly accross from each other in the jacket as would be the case for a four groove for ex. He also said that he felt the 90 degree rifling was a slight advantage in small caliber bullets especially with short bearing surfaces........Rich [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why No 3R rifling??
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