crest117
Member
If two bullets are identical in weight, size and shape, but one has a cannelure and the other does not, will one be more accurate than the other when loaded equally? If so, why?
Does a cannelure affect a bullets accuracy?
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LiveLife
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https://www.thehighroad.org/index.php?threads/cannelure-affect-on-accuracy.769058/#post-9734053
As discussed in the linked thread, not much.
I think more consistent neck tension and better shape of bullet base (boat tail) may do more for accuracy.
As discussed in the linked thread, not much.
I think more consistent neck tension and better shape of bullet base (boat tail) may do more for accuracy.
rfwobbly
Member
Lead or jacketed ? Rifle or handgun ?
243winxb
Member
Sierra added a cannelure to a rifle bullet thats loaded by Black Hill for the military. The video said no effect on accuracy.
Watched the Youtube clip this morning. http://www.black-hills.com/product-category/mk-262-mod-1-c-mil-pack/ 77 gr Sierra
Watched the Youtube clip this morning. http://www.black-hills.com/product-category/mk-262-mod-1-c-mil-pack/ 77 gr Sierra
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FROGO207
Member
From personal experience shooting the same bullet shape/weight/ brand wether it had a canalure or not the accuracy was the same in my ammo. Using 55 grain .224 bullets or using .308 150 grain bullets.
Targa
Member
My accuracy is no where in the ball park of being precise enough that I could differentiate between a cannelure or no cannelure.
The one with no cannelure, because it damages the jacket. They use the best most concentric jackets for match bullets, why would we wan't to damage them?
That is true for a lot of instances, but I stand on what I posted, the undamaged jacket, if we can prove it, will shoot better.
Targa
Member
^^^No argument here. I am just saying that I am not good enough to know it.
243winxb
Member
I agree.
The cannelure when applied, is going to move the lead core away from the jacket. The lead will have to spring back.
The Black Hills standard of .64 MOA maximum/10 shot groups for the 77 gr Sierra will not win any short range BR matches. Still, not bad accuracy.
To test, need a fast twist barrel & Sierra 77 gr with & without the cannelure. My 9 twist wont work.
earplug
Member
Adding another manufacturing step to production increases the chances of having variances in the completed product.
Accuracy is all about consistency
Accuracy is all about consistency
the reality is that the cannelure must reduce accuracy, for the obvious reasons. That said, for magazine length seating, crimping can improve velocity deviation, and with that, improve accuracy, depending on the chamber, maybe enough to offset the effect. i would think this is likely in long/wide freebore chambers. Seating off the rifling would eliminate that advantage, making the smooth bullet better. That said, the most accurate load i have ever shot used cannelure, but that was 100 yards, and I am not the best shooter.
BWS
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This is gonna sound argumentative,but that is truly not the intent.
"If" your metric on handloading rifles is the highest velocity with acceptable precision then,cannelure's and/or roll forming probably isn't for you.
But go outside that criteria and it "can" make an improvement. I roll form cast bullets for some pretty high intensity chamberings(from a CB vs JB standpoint) and the resultant knurling makes a difference in reducing UFO's(flyers
)..... but this is anything but "normal" in the sense of most JB handloading.
Yes cannelure's suck,carry on
.
"If" your metric on handloading rifles is the highest velocity with acceptable precision then,cannelure's and/or roll forming probably isn't for you.
But go outside that criteria and it "can" make an improvement. I roll form cast bullets for some pretty high intensity chamberings(from a CB vs JB standpoint) and the resultant knurling makes a difference in reducing UFO's(flyers
)..... but this is anything but "normal" in the sense of most JB handloading.Yes cannelure's suck,carry on
.We are talking about jacketed bullets.
That said yes, a good crimp can help things that help accuracy in some applications, but when it comes to pure accuracy in rifles no one anywhere uses bullets with cannelures.
That said yes, a good crimp can help things that help accuracy in some applications, but when it comes to pure accuracy in rifles no one anywhere uses bullets with cannelures.
JFrank
Member
If you don’t mind me asking.
Why not ?
Here’s a load I made up using cannelured 165 BTSP it’s still not super fine tuned but at 200 yards it’s a deer killer for sure. ( I going with the Blue seating depth btw)
J
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sparkyv
Member
Sharpies!
JFrank
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sparkyv
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JFrank
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I’m not sure I qualify but w t heck
rskent
Member
Shot out of what rifle? And by who?
243winxb
Member
https://www.goarmy.com/events/army-marksmanship-unit.html
The 77 gr bullet, MK262 ammo, seemed to be loaded for the military, at first.
After the cannelure is applied, bullets would go into a finish die, giving the bullets their final forming.
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