cannellure Q


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97guns
November 21, 2008, 05:27 PM
im set up for .308 and bought 2 bullets, hornady 150gr. FMJBT and remingtons 165gr corelokt SP. both have a cannellure and when i seat it to 2.8" the cannellures are showing. does anyone have data for these 2 bullets, should i be seating them deeper so the cannellure is burried in the neck.

total newbie here - please help

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MMCSRET
November 21, 2008, 05:45 PM
The position of the cannelure is not important unless you are going to crimp the case into the projectile, then the cannelure will make for a much more secure crimp without deforming the bullet jacket. I seat mine out to the limit allowed by the design of the rifle.

97guns
November 21, 2008, 05:47 PM
does this look ok?

http://i107.photobucket.com/albums/m312/hd0642/HPIM0217.jpg

SamG.
November 21, 2008, 05:51 PM
I know NOTHING about reloading but I'd have to say that I would go a little farther; just judging by what my M193 rounds look like.

NCsmitty
November 21, 2008, 06:10 PM
The key here is if they fit in your magazine without hanging up, and if they chamber ok in your rifle, they are fine. A general rule is the less jump the bullet has to make to the rifling, most often it equates to a more accurate load.
By the same token, you do not want to push the bullet into the rifling when you chamber as it may cause a pressure spike initially just getting the bullet moving.
Some benchrest enthusiasts do engrave the rifling when they chamber the round on the premise that it centers the bullet in the rifling. I do not do that nor recommend it to someone just starting out. If you stick with the recommended COL for that bullet, you'll do fine.

NCsmitty

USSR
November 21, 2008, 06:28 PM
Disregard the cannelure. Load them to a length that fits your magazine, as long as the bullet ogive doesn't contact the leade.

Don

Walkalong
November 21, 2008, 06:52 PM
Yep.

If you are not roll crimping, which would be into the cannelure, any length that is short enough for your magazine and short enough to chamber without jamming the bullet hard into the leade, you will be fine.

If you still wanted to crimp, but wanted to seat at a length that did not match up with the cannelure, you could use the Lee Factory Crimp Die for rifles which does not need a cannelure.

97guns
November 21, 2008, 08:22 PM
ok thanks guys, i chambered these 2 dummy rounds and remeasured, they were both still 2.8"

Coltdriver
November 21, 2008, 09:21 PM
Interesting question because I have the opposite problem in reloading those exact bullets for a 300 WSM. The canelure is into the neck.

I wonder if they would not line up pretty much perfectly for a traditional 30 06?

The only thing I would make sure of is that you have them seated at least an 1/8 of an inch into the neck of the case around the part of the bullet that measures full width. At least you get some grip that way.

Another thing to just check is to shoot a few. Load your magazine and shoot one. Then pull the bullets and make sure you have no slippage either way.

rcmodel
November 22, 2008, 01:06 PM
A general rule of thumb is to seat at least one caliber deep in order to get enough neck tension/bullet pull.

So with a .308" bullet, seat at least .308" deep or more.

rcmodel

NCsmitty
November 22, 2008, 02:59 PM
Interesting question because I have the opposite problem in reloading those exact bullets for a 300 WSM. The canelure is into the neck.

Coltdriver, the 300 WSM is a great cartridge, but being in a short action, it has to live with short COL's. It's case length is about .100 longer than the 308 and yet still has to fit in that short magazine. Everyone is short action crazy because it saves 2 oz. If you could seat the bullets out and not infringe on the powder space in a longer action, it would only enhance the performance and accuracy capabilities of that great round. A Savage long action fitted with 300 WSM barrel could possibly circumvent that issue.
Just rambling as I do from time to time.

NCsmitty

slpmmp
November 22, 2008, 11:09 PM
It's in the ballpark. According to Lymans 48th edition the 150 gr should be 2.735 OAL and the 165 gr should be 2.780 OAL. But who's counting a few hundreds of an inch??? Little longer is better than shorter...ask any guy LOL

fguffey
November 23, 2008, 05:59 AM
Rule of thumb? There is no rule of thumb. the 30 Gibbs neck length is .217, the bullet diameter is .308, The 300 Winchester Mag neck length is .264, the bullet diameter is .308.

F. Guffey

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