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December 25, 2019, 12:38 PM | #1 |
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What's with the two "lines"
See pic below. Found these in some range brass. 39 special. What's with the two lines. I've seen one line before, but not two.
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December 25, 2019, 01:17 PM | #2 |
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Wadcutter brass. Good stuff to have if you load wadcutters.
Don
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December 25, 2019, 01:51 PM | #3 | |
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December 25, 2019, 02:42 PM | #4 |
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Huh. I'd always wondered, but it all reloaded the same...
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December 25, 2019, 04:00 PM | #5 |
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Learned something today. Never seen brass like that.
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December 25, 2019, 06:35 PM | #6 |
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The first cannelure below the mouth of the case marks where the base of the bullet was in the original load. This is a holdover from the 19th century when a deeply rolled groove at that location actually stopped the bullet from being seated too far (or not far enough, as compressed black powder loads often performed best). I don't actually know what kind of loading equipment they used in the factories then, but suspect it may have been dozens of stations with something resembling a wine corking press. Perhaps someone can come up with a photo.
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December 25, 2019, 08:47 PM | #7 |
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Note: Not all wadcutter brass has 2 cannelures. Winchester and Remington do, but with Federal there is just a single cannelure located just north of mid-case instead of just below the case mouth as with regular loads. CBC brass has a single cannelure just south of mid-case and the headstamp has a "c" and a "v" opposite each other. GFL (Fiocchi) has no cannelure, but the headstamp says "Wad Cut.". I cast my own HBWC's, so with these bullets being seated so deeply I only use wadcutter brass. Hope that helps.
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December 25, 2019, 10:22 PM | #8 |
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December 26, 2019, 11:06 AM | #9 |
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The lines are for use of optical lasers for QC. The bottom one is for check of powder fill. The top one is for the showing of the area where the base of the bullet would be. That was told to me by a commercial reloader that worked for Remington for 45 years until he retired.
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December 26, 2019, 11:30 AM | #10 |
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Must be a modernized application for the case cannelure, as cartridges made long before there were lasers had them. If you look at Lake City M852 cases, they have a cannelure way down just above the head to provide rapid indication they were for match use only and not for combat. Way below any powder or bullet level. So these have been used for different purposes at different times.
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December 26, 2019, 11:37 AM | #11 | |
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The good old "Learning Curve"
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Now then, have to ask; Are other calibers marked in like manner? Be Safe !!!
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December 26, 2019, 11:46 AM | #12 |
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I've had several different brands and calibers that have had cannelures on the case. After a few reloadings they tend to go away.
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December 26, 2019, 11:59 AM | #13 |
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Didn't Remington produce 38 Special wadcutter ammo a few decades before a laser was invented? If the bottom cannelure was acting as a powder level indicator, they must have been using a really bulky powder or using really heavy loads (?).
I agree with the fellers above that state first cannelure is for bullet depth "stop" and second (nearest the case head) is for identification. I had a few cases with two cannelures but can't remember the last place I saw them (I have been reloading 38 Specials since ;69)...
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December 26, 2019, 12:37 PM | #14 | |
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December 26, 2019, 12:50 PM | #15 |
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Ooops . . . yeah 38 special
Yeah, I meant 38 special. Forgot to mention that in the same pile of range brass I found some unfired 38 special wad cutters, so that kind of makes sense. So much to learn, so much to learn.
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December 26, 2019, 12:51 PM | #16 |
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Remington, UMC, Peters(?) and Winchester's brands put the double cannelure on their .38 Spl wadcutter ammo. Don't think anyone else did. Always heard it was just for ID not for any physical reason.
Started loading .38s in the early 70s, have had hundreds of them, still probably have a few boxes worth in my ammo stash. I think they stopped doing the double cannelure about 40 some years ago, possibly a bit longer. I don't recall seeing it done on anything else but .38Spl wadcutter ammo.
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December 26, 2019, 01:22 PM | #17 |
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He told me of that when I had a box of .38 Spcl. JHP that had the two lines like that. Also have a few .45 ACP CorBon cases with the same lines. Either way I do not care. When reloading they are reloadable. I have reloaded many with my home cast bullets.
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December 26, 2019, 02:54 PM | #18 |
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A Remington rep told me that front cannelure just behind the bullet base was originally used on some lever action rifle cartridges in the under barrel magzine tube to prevent bullet setback from recoil.
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December 26, 2019, 03:52 PM | #19 |
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A lot of disinformation here. The front case cannelure is NOT behind the bullet base. It is located in alignment with the rear bullet cannelure which is a little over 1/8 inch above the bullet base.
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December 26, 2019, 04:00 PM | #20 | |
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I got my info in the late 1970's from that rep I shot matches with. Last edited by Bart B.; December 26, 2019 at 04:10 PM. |
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December 26, 2019, 04:26 PM | #21 |
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No problem. You will notice that I am not saying that so-and-so told me this or that. I have Remington wadcutter brass and Remington HBWC's in my hands and am able to determine this with my calipers and Mk. 2 eyeballs.
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December 27, 2019, 05:26 PM | #22 |
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The upper cannelure did line up with the bottom of the original RN lead bullets. With an HB wadcutter it won't line up, unless, perhaps, with a DEWC.
Here's an example of a modern bullet for which you can make out the bulge that mirrors the bullet base location, having the case cannelure correspond to it. In this instance, the only value would be letting you see at a glance the size of the seated bullet is. However, for functional purposes, it is lubricated lead bullets, which one can often push deeper into a case with one's thumb, that would most benefit from having a ledge to sit on in the case. The old 38 Longs had them pretty commonly as did .38 Special. Not a cannelure, as they roll in today, but a groove rolled into the case. The cannelure seems just to be a modern version of the form. You can see the old form in the photo of four rounds near the top of this page.
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December 27, 2019, 06:50 PM | #23 | |
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December 27, 2019, 07:14 PM | #24 |
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Nick,
Maybe on the single cannelure case where the cannelure is located higher up on the case, but the upper cannelure on the wadcutter brass is located half an inch below the case mouth. That would require the 158gr lead RN bullet to have a total length of 7/8 of an inch for the base to align with the upper cannelure. Not likely. Don
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December 28, 2019, 02:05 PM | #25 |
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As the photos I linked to show, for any RN the original grooves did line up with the bullet bases and on some modern loads the cannelures do. Why the wadcutter forward cannelure is exactly where it is, I don't know. I suppose it might line up roughly with the base of the bullet in the 200-grain Super Police load.
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