So, I started this recent thread about reloading .303 Brit, and mentioned that I was using these blemished bullets that I'd bought from Midway a couple years ago. I bought 'em thinking "bargain bullets, sweet!" Say's they're "blemished", but they're bullets, and FMJ's to boot. How "blemished" can they be? So I bought 500.
What a fool.
I reckon that when some minimum-wage dipstick at the bullet factory sets the canneluring machine exactly 1/8", yes, .125", off from where it's supposed to be, then those bullets will qualify as "blemished". Bah. Reckon they'll still go down the barrel is a straight line, I hope.
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Not all rounds you use the cantalur as a crimping line I know with the 97gr banners for the 6.8 the bands are way above the case mouth and still shoot sub MOA in my gun so you will be good.
Not all rounds you use the cantalur as a crimping line I know with the 97gr banners for the 6.8 the bands are way above the case mouth and still shoot sub MOA in my gun so you will be good.
Maybe not, but that's where they should be. That's what the cannelure is for, as far as I know, is for the case mouth to crimp into. I don't know, maybe I'm wrong. Happened once before.
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I have never crimped 303s.
The military ones were always crimped for using in machine guns
as well as rifles Multi use, never had any problems with the bullet
being left in the breech when ejected.
Good cases hold the bullet firmly enough.
Maybe not, but that's where they should be. That's what the cannelure is for, as far as I know, is for the case mouth to crimp into. I don't know, maybe I'm wrong. Happened once before.
No that is not what they are made for I think you should do some research on terminal ballistics. On most modern ammo the main resin for the cannelure is to weaken the jacket at a predetermined point to enhance fragmentation. It just happens to be near the perfect location to also use as a crimping grove on most bullets. It is just that most had loaders mistake this as what length they must lose there ammo to but it is not
That is the first time I have heard that explanation of "cannelure" and a quick search gave me 5 references all stating that the cannelure is for crimping.
What is your reference for the enhanced fragmentation statement?
DocAitch
That is the first time I have heard that explanation of "cannelure" and a quick search gave me 5 references all stating that the cannelure is for crimping.
What is your reference for the enhanced fragmentation statement?
DocAitch
Not to be a Smart Donkey... but they are Blemished... Do you have a Lee FCD???
Yes, I do. The Lee FCD in this case is merely a 4-sided collet that crimps the mouth of the case, There's no resizing involved in a Lee FCD for rifle calibers. And yes, I'm lightly crimping them with the FCD, you can see that in the photo.
And I KNOW they're blemished! That's why I bought them! I just never dreamed that the "blemish" would mean that the cannelure was 1/8" off from where it should be. I figured "blemished" meant they had scratches, or minor flaws in the jacket, or dented points....things like that.
Quote:
No that is not what they are made for I think you should do some research on terminal ballistics. On most modern ammo the main resin for the cannelure is to weaken the jacket at a predetermined point to enhance fragmentation. It just happens to be near the perfect location to also use as a crimping grove on most bullets. It is just that most had loaders mistake this as what length they must lose there ammo to but it is not
I use the FCD even on bullets that have no cannuler, the FCD is strong enough to make one. No worries there, you will be fine!
Future reference blemished can mean ANYTHING!!!! I got some blems that were nosler accubonds with a purple tip... oops... but I then got some Rem core lokt bullets that had jackets mis aligned...
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Not all rounds you use the cantalur as a crimping line I know with the 97gr banners for the 6.8 the bands are way above the case mouth and still shoot sub MOA in my gun so you will be good.
I neber use the cannelure as the crimping spot. I use the calipers, instead.
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That is the first time I have heard that explanation of "cannelure" and a quick search gave me 5 references all stating that the cannelure is for crimping.
What is your reference for the enhanced fragmentation statement?
DocAitch
Look at the DRGKRs reports on T/B and the DOD reports on the search for better FMJ ammo it explains it all.
I bought some .270 blemmies once. The blemish was they WERE put through a cannelure machine. They weren't supposed to have been,
Shot outstanding, too!
Were they 115gr Custom Competition by any chance I know there was a big over run of them that were made with a cannelure for SSA to be used in the 6.8 as the 115 OTM enhanced fragmentation round for .MIL testing .
I generally use the cannelure to locate the bullet in the case, as long as they allow proper COAL. The 123 gr. bulk bullets I am currently loading for my 7.62X39 are exactly right.
For .303 Brit I don't crimp - don't see a reason for a bolt action. Most of the bullets I use do have the cannelure but some don't.
I have bought the 'blems' before, and one batch had no problems I could see - I even compared them directly to the 'good' bullets I had bought before at a higher price. I did not check the weight. Maybe a difference there? But nothing the unaided eye could detect! The price was right and they shot fine.
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A lot of blems ate also just over run of a special run of ammo like the .277 115 gr that I mentioned above the production 115gr cc do not have a cannelure but SSA custom ordered them with it for there ammo and there was like 500k rounds of over run they needed to sell but couldn't sell them as firsts do them having a cannelure.
Maybe not, but that's where they should be. That's what the cannelure is for, as far as I know, is for the case mouth to crimp into. I don't know, maybe I'm wrong. Happened once before.
Quote:
Originally Posted by Dark1
No that is not what they are made for I think you should do some research on terminal ballistics. On most modern ammo the main resin for the cannelure is to weaken the jacket at a predetermined point to enhance fragmentation. It just happens to be near the perfect location to also use as a crimping grove on most bullets. It is just that most had loaders mistake this as what length they must lose there ammo to but it is not
Actually, your both right to some degree.
the cannelure is generally in the right position to use as a crimping groove reference, but not always for a particular loading. one bullet design can be used in mulitple applications at times and some correct OAL measurements may not line up with the crimping groove in all applications.
the cannelure creates a distortion in the jacket material leading to specific results. it does interfere with bullet expansion if it reaches this point. also before bonding of the core to the jacket the cannelure aided in preventing jacket and core seperation, but only up to a point was it effective. if expansion exceeded the cannelure groove core seperation was almost sure to occur at this point. if a jacket was designed thin enough or designed with weak areas to enhance expansion the cannelure was the last stop before complete, controlled, fragmentation occured.
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