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January 5, 2014, 12:04 PM | #1 |
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RN bullets in tubular magazines.
I've read two threads, one is mine, about people using round nose bullets in tubular magazines, one in 30-30 and one in a .44mag carbine.
I was taught this is a bad idea because it could set off a primer in the tube and that flat points should always be used, which made sense to me. Is this thinking wrong? What prevents the round nose from detonating the primer?
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January 5, 2014, 12:27 PM | #2 |
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'Cause it's not pointy enough.
Only if the bullet shape is more like a firing pin is there danger of rounds going off in the magazine. So no typical spitzer rifle bullet shapes. Unless it's a soft point, like the polymer tipped Lever Revolution rounds recently introduced by Hornady and the like. http://www.chuckhawks.com/leverevolution.htm
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January 5, 2014, 01:23 PM | #3 |
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Remington sells round nose 30-30 ammo, so they must think it's OK.
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January 5, 2014, 04:05 PM | #4 |
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I think round nosed bullets have too much surface area on the bullet in front of it in the tube, to set off the primer. Pointed spitzers have a much finer point, which has a much greater chance of setting off the primer. It would take much more force for a RN pushing into a primer, than a pointy bullet with a hard tip. I've always been under the impression that RN bullets were fine in a tube, along with FP and SWC, WC. Only specially designed spitzers, such as the Lever Evolution (because their tip is very soft and still fairly rounded compared to something like a .308 FMJ spitzer)
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January 5, 2014, 10:05 PM | #5 |
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No Problems w/ round nose bullets
I believe the original Winchester load used a "Round Nose" bullet. I have been loading Sierra 150 grn "round nose" Pro Hunter bullets in two tube fed 30-30's for over a year (200 rounds) with no issues.
One is a Winchester Model 94 (1974) and the other a Savage Model 170 (pump gun/tube magazine). Neither one is a tack driver but both are accurate enough. Savage is 2" scoped @ 100 and the 94 is 3-1/2" with peep sights. Gooder enough for deer out to 150 yards or so. |
January 5, 2014, 11:13 PM | #6 |
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Brutus,
A lot of people that produce ammo for lever guns use roundnose projectiles. I personally nave no problem with roundnose and in fact load up spitzers to be used one at a time and never put in the tube. But if you want a real test to understand the issue load up a dummy shell with whatever point you want to test and then prime a piece of brass with no load. Place them in a short tube similar to what the leverguns have and smack the top one with a hammer. At best you might get the impression of the primer hole on the dummy tip. To get that same force you might have to drop the gun off a cliff but I doubt it will go off. |
January 6, 2014, 12:00 AM | #7 |
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Essentially is has to do with size (surface area) and hardness, as well as shape.
Round nose bullets (with lead noses) are nearly as large as the primer itself. Unlike the pointed shape of a spritzer, the round nose simply will not crush the primer enough to set them off. GENERALLY. FMJ RN (particularly with a small bullet tip) might. When you look at the RN bullets for lever guns, including pistol calibers, they are all fairly blunt. Bullets don't have to be flat tipped, just blunt enough (or soft enough - today's pointed polymer tips) to not set off the primer of the round ahead of it in a tube mag under recoil. If you look at a 9mm Luger FMJ, you will see some of them with a very pointed "round nose". Bullets like those would be a high risk in a tube mag. Bullets with a wider tip, rounded or flat are much safer in a tube magazine.
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