10 replies [Last post]
JJD
JJD's picture
Offline
Location: Right Side WA state
Joined: 11/07/2008
Posts: 208
Full length VS Neck sizing

Whats your opinion on FL sizing, as oppossed to Neck sizing in belted magnum cases?
Not for a bench rest machine, but in a hunting rifle.
There are certainly advantages to both, how do they weigh out in your opinion?

Offline
Location: leftern washington
Joined: 04/27/2008
Posts: 83
Full length VS Neck sizing

i do a full length size on new brass, i then fire it once and neck size it for my hunting round. i feel the less that case has to expand the more energy is going down range, and ive found the rounds to be a little more accurate. could all be in my head though Think

Offline
Moderator
Joined: 12/03/2005
Posts: 1691
Full length VS Neck sizing

littlebuf is right as for the case sizing, not to sure of the expansion theory though.

Regarless of your preferred method, one reload and then things get weaker,and weaker etc. I wouldn't be reloading more than once, I'll toss the spent cases and buy,beg, whathaveyou. some more
There is no advantage to one method over the other in my opinion.

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3173
Full length VS Neck sizing

I would always neck size a belted case. The reason is that those cases head space on the belt, not the shoulder. Magnum chambers are notoriously sloppy. Because of that, every time you fire one there is a lot of stretch in the case head. After a few re-loadings FL, you'll notice a ring forming around the head of the case, in front of the belt. That is caused by the case stretching and being re-sized down every time. That is a case heading for head separation.

To reduce that problem, neck size. Then when the case is fired the first time it will stretch to fill the chamber and back off just a bit as it cools. At that point the case fits your chamber and if you keep the shoulder where it is, the case will head space on the shoulder and reduce stretching in the head.

Your FL die can be adjusted to make the case fit right. Simply back it out so it sizes only the neck. After a couple times of that it will become very hard, maybe impossible, to close the bolt on another round. Try to close the bolt on the fired round. If it closes, neck size again, if not, it's time to adjust the die to your chamber.

To do that, Back the die out of your press about one turn. Re-size a case and try it to fit in your chamber. if it doesn't, turn the die in about 1/8th turn and run the case through again. Keep doing that till the case will chamber easily. Then you have the die set to match your chamber. What you've done is bumped back the shoulder just a bit to allow the case to feed. It might also squeeze down the walls just a bit also so I'm told, but not much.

The drawback is that the dies is now set for one rifle only and may not work with another rifle of identical cartridge. But you'll increase case life by greatly reducing the stretch at the head of the case.

JJD
JJD's picture
Offline
Location: Right Side WA state
Joined: 11/07/2008
Posts: 208
Full length VS Neck sizing

Good call Don,
Some good points.

Thanks all for the input.

Offline
Location: s. california
Joined: 02/01/2008
Posts: 69
Full length VS Neck sizing

is that for magnum cases only. i just getting back into reload, my wife bought me new set for christmas. anyyways i still need power and primers so ill be setting stuff up soon ill be asking again thxs

Offline
Moderator
Joined: 12/03/2005
Posts: 1691
Full length VS Neck sizing

Not a magnum case only subject at all.

Here's a link worth a read:

http://carteach0.blogspot.com/2007/11/reloading-accurate-rifle-ammo-neck...

JJD
JJD's picture
Offline
Location: Right Side WA state
Joined: 11/07/2008
Posts: 208
Full length VS Neck sizing

Excellent link Hammer1
Thanks Yes

Don Fischer's picture
Offline
Moderator
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3173
Full length VS Neck sizing

It will work on standard cases too. But for me it's not worth the trouble. What happens if you neck size with a FL die is that unless you get the die set exactly right, bear in mind 7/8 14 threads are very corse, the case will continue to grow till it will no longer fit your chamber. Then you need to back it down again or thru slow trial and error, keep sizing the same case turning the die down maybe 1/8th turn and chambering till the bolt will close on it.

The advantages are practically nill, especially for the hunter/varmit shooter. I read an article in the Sierra manual that claims that even bench rester's are no longer neck sizing. If that's so, the gains are even smaller than you might think. and once you do finally get the dies adjusted to that particular chamber, it may not work foe a different chamber so you'll have a die that works in only one rifle.

Don't buy the hog wash about improved accuracy. There are other things to do that will help accuracy more.

Offline
Location: s. california
Joined: 02/01/2008
Posts: 69
Full length VS Neck sizing

okay, so if u fl your cases. what is the average u can full length one case?? i just started to reload, i just completed 53 rounds which i basically put back to factory spec. meaning im using a hornady book and the rounds are at length with rem core locks. they were accurate im my rem 30 06 so when i get a chance im going to the range thx robert

Offline
Moderator
Joined: 12/03/2005
Posts: 1691
Full length VS Neck sizing

rude robert asked:
what is the average u can full length one case??

Too many variables to give any kind of definitive answer but every case should be closely inspected before and after resizing. If in doubt, throw it out. And I would imagine the metal case of one manufacturer has slightly different properties than that of another for copyright reasons at least, so I won't hazard a guess

I use 30.06 cases for my 270 reloads and have such a quantity that I reload once and then toss em. Get some folks to save their cases for you, get them at the range, or even buy them. 06 cases should be dirt cheap

Related Forum Threads You Might Like

ThreadThread StarterRepliesLast Updated
Crimps and Sizingcre101305/17/2009 17:24 pm
Full vs Neck SizingCVC808/18/2007 19:54 pm
Dies and powderNH Hunter1102/02/2007 09:31 am
Reloading 1ST time brass and FL sizingfire5179401/19/2010 10:14 am
I'm Back With Another QuestionCVC1609/04/2007 23:08 pm