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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Benchmark Barrels
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<blockquote data-quote="DJ Fergus" data-source="post: 2008193" data-attributes="member: 93895"><p>This is the first 5 groove I have that has conventional rifling, I have others that are 5r. I don't think that there will be a noticeable difference between the two unless a person is going to approach and go beyond 3200fps in a fast twist with thin jacketed match bullets. The 5r lands don't engrave into the bullet jacket as aggressively as standard conventional rifling. I'm shooting a 7mm 180 eld to just below 3200 fps in a bartlein 8.7 twist 5r. I have not had a mid air bullet blow up but some people have. Some people have eld-m bullets blow up mid air because of the bullets thin jacket. It seems to be more likely to happen with fast twist, high velocity in conventional 4 groove rifling but not necessarily isolated to them. If I planned to push those bullets fast in a fast twist, I believe it would be helpful to go with a 5r. Some people blame the bullets and I won't argue that the jackets on the ELD-m are among, if not the thinnest there are. There's probably some people who have had blowups in a 5r with them also, but I'm going to guess it's less of those than with conventional 4 groove. Also, 5 lands oppose each other instead of opposite of each other's engraving into the bullets jacket. Some say this doesn't deform the bullet as much. I can't testify as to what effect that has on accuracy but I don't think it's significant. My opinion in a nutshell is: high velocity plus fast twist plus thin jacketed bullets: 5r may help avoid blow ups.</p></blockquote><p></p>
[QUOTE="DJ Fergus, post: 2008193, member: 93895"] This is the first 5 groove I have that has conventional rifling, I have others that are 5r. I don't think that there will be a noticeable difference between the two unless a person is going to approach and go beyond 3200fps in a fast twist with thin jacketed match bullets. The 5r lands don't engrave into the bullet jacket as aggressively as standard conventional rifling. I'm shooting a 7mm 180 eld to just below 3200 fps in a bartlein 8.7 twist 5r. I have not had a mid air bullet blow up but some people have. Some people have eld-m bullets blow up mid air because of the bullets thin jacket. It seems to be more likely to happen with fast twist, high velocity in conventional 4 groove rifling but not necessarily isolated to them. If I planned to push those bullets fast in a fast twist, I believe it would be helpful to go with a 5r. Some people blame the bullets and I won't argue that the jackets on the ELD-m are among, if not the thinnest there are. There's probably some people who have had blowups in a 5r with them also, but I'm going to guess it's less of those than with conventional 4 groove. Also, 5 lands oppose each other instead of opposite of each other's engraving into the bullets jacket. Some say this doesn't deform the bullet as much. I can't testify as to what effect that has on accuracy but I don't think it's significant. My opinion in a nutshell is: high velocity plus fast twist plus thin jacketed bullets: 5r may help avoid blow ups. [/QUOTE]
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