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March 28, 2014, 10:11 AM | #1 |
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Cannelures and Rifle rounds. OAL an issue?
When loading pistol rounds I use the cannelure as my point of reference when seating the bullet for crimping.
For my .308 I don't crimp. So is seating to the cannelure still necessary? I am planning to load my OCW cartridge ladder and it seems, according to a member's PM a while back that the OAL for the Hornady 3037 FMJBT 150gr bullet is 2.780". For now that is fine, but once I have my ideal charge weight I will be wanting to play with OAL for accuracy, especially as I now have the Hornady OAL gauge kit. However, these bullets have a cannelure: none of my previous bullet choices have had them, though. Restricted to 2.780, or can I play around...?
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March 28, 2014, 10:16 AM | #2 |
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I ignore the cannelure when I'm not crimping.
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March 28, 2014, 12:19 PM | #3 |
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I too, ignore the cannalure for rifle rounds and seat bullets to the manual's suggested OAL for that particular bullet. Sometimes the cannalure lines up with the case mouth, sometimes it don't...
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March 28, 2014, 02:26 PM | #4 |
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Yep, ignore it.
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March 28, 2014, 02:33 PM | #5 |
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i had a .308 that load that i gave its oal as 2.859 which was 35/1000 of an inch off the rifling of that gun.would not feed through the magazine but was very accurate.
always be carefull working up a load that is seated that close to the rifling though. |
March 28, 2014, 05:41 PM | #6 |
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I have ignored the cannelure with Hornady .303 FMJBT bullets, with no ill effects. That's when loading with press, dies etc. When using the Lee Loader, I use it as my seating depth indicator so I can get away with not being able to check OAL with a caliper. But I still don't crimp.
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March 28, 2014, 07:10 PM | #7 |
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You can even ignore the OAL listed in the manuals as it has little or nothing to do with your rifle and your loads.
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March 28, 2014, 08:25 PM | #8 |
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The only reason I can see for a cannelure on a rifle bullet is to form a ring on the inside to help restrict mushrooming in game, like, for instance the Inner-belted Remington bullet.
So, why does the FMJ have a cannelure? Got me!!! Then I don't load for a machine gun...I guess they crimp. Have fun, Gene |
March 29, 2014, 02:09 AM | #9 |
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Thanks folks.
I will load to the recommended COAL for now and see how they fare. Even if i want to get closer to the lands, there is mag size to consider and the fact that these are significantly shorter bullets to the Amax and Scenars I have too, despite their mere 5gr higher weight. If I seat to similar COALs as those two, my FMJBT will barely have half of its body in the neck!
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March 29, 2014, 11:47 AM | #10 | |
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Quote:
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