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Discussion in 'Reloading' started by 270fan, Sep 27, 2007.
Which do you prefer and why? Thanks.
I like to neck size only. This extends the life of the brass alot. If it starts to get too tight in the action I will bump the sholder back just a little.
If you are using standard dies for standard chambers, then they tend oversize the brass a lot. I try to neck size and then use FL every 2-3x only and set min shoulder bump.
if I have a custom die for that chamber or JLC custom honed die, I FL everytime as it is neck bushing and set to do min shoulder bump at same time.
Neck size only and use same brass same gun, yea I have alot of those lil green boxes. These are all 100% hunting guns so not alot of rounds go through em(25 a season If we play on the bench) so the need to full lenght hasnt arrived yet.....but better make sure you have the right box for the right rifle...sucks to drive 2 hours for an afternoon hunt and dont have a 7mm that will fit in the gun....to fix the hunt I did load 3 at his dads reloading shed.
My bud has the exact same 7mm rem as I, my once fired will work fine in his.....his ABSOLUTLEY WILL NOT CHAMBER IN MINE AT ALL!
Right wrong or indifferent thats all I do.
270 win, been shooting it for 30 years. On its second barrel. I use full length dies and only size 1/2 the neck.
Why? Longer case life, less work, I have the thought that the unsized portion of the neck helps to hold the case straight in the chamber. (true or not it makes me feel better),
In my 270 AM I full length resize in a very specific manner. Why? Cause that what Kirby says to do, and that makes me feel better too.
Roy does Kirby send out a instruction sheet with his rifles? Cuz I gonna need lots of instuction!
Its hard to say that neck sizing or FL sizing is better over the entire range of differnet situations out there. Let me explain.
If I have a 6mm-250 Rem that I use with a moderate pressure load for target comp shooting, I would recommend neck sizing because the low pressure combined with the generous body taper on the case design will allow this and still offer good chambering and good extraction.
On the other hand, say your working with a round that is used at upper end working pressures and is in a case design with minimal body taper, you will want to at least partially FL size these cases.
Partial FL sizing is when you run the case up into the FL sizing die as far as you can but stopping just short of touching the shoulder of the case in most instances. What this does is size your necks and also slightly reduced the diameter of your case body to insure that the round will chamber and extract well with the higher pressure loads being used. If you do not reduce this body diameter slightly, after a few firings you will start to notice the cases being a bit difficult to chamber as well as getting sticky extractions. Just reducing this body diameter slightly without touching the case head will insure easy chambering but also keep that shoulder where it should be for accurate loading.
In rounds such as my Allen Magnums which have very little body taper and are designed to work at the upper range of working pressures for their parent case designs, I recommend just very slightly bumping the shoulder. BY this I mean, setting it back no more then a thou or two as well as reducing the body diameter just slightly as well. This is basically FL sizing but not to the degree that the shoulder is relocated as it would be with conventional FL resizing.
This is a technique that must be practiced and learned and checking sized empty cases in the rifle for chamber feel while setting up the sizing die is critical to getting it right. What you want is the case to go from just a snug fit in the chamber needing a slight bit of force to close the bolt to the bolt closing easily.
The trick is to hit it just right. The difference is generally less then 1/8 revolution turning the die down into the press, often around 1/16th of a turn is perfect. You have to go slow, you have to pay attention as well but once you get it, you will get the benefits of a neck sized case as far as accuracy and long case life is concerned and also the benefits of a FL sized case in easy chambering and extraction.
I would also agree with Bounty Hunter on this one that if your using Standard dies, you will size your shoulders and necks down much more then needed but if you are careful not to agressively set that shoulder back with FL sizing you will be fine.
In my experience, FL sizing with the proper dimensioned dies and JUST barely bumping the shoulder has produced the best results for me, especially in high pressure, min taper case designs.
FL or neck sizing.
Thanks for the info fellas. Maybe Kirby sends out the sheet you referred to. If so I will get one with the 260 he is building for me. Of course he covered most of it in the informative dissertation above. I really appreciate someone knowledgeable like that taking the time to fully explain it to those of us who are learning. Thanks
Kirby, I will send you scopes for the two rifles you are building for me soon.
Read Kirby's post above about the new term "Partial full length resizing" With the APS Allen Mags and I suppose the AXs this is critical. It took me way to long to catch on to this technique.
Too little resize results in a ring at the base of the neck.
Too much resize results in wrinkled cases just below the shoulder.
W/my die that's not very much of a turn. More like a tweak.
Once you get it its there forever.
Then for starting new cases like necking 300s to 270 slip a gasket/thin washer of about a dime's thickness between the die locking ring and top of the press and you're ready to do the initial neck size for fire forming with out dinking with the die setting.
It took my way too long to catch on to this also.
270fan. Even though the Good Book says "thou shalt not......" I envy your situation. Two rifles at APS Ya ought not post such stuff. It causes grief.
I shoot competition as well as load for my sporters. I FL everything but that being said all of my dies are cut from the same finish reamer that were used for the barrel.
Roy I think he's got all my parts....whooohhhooooo itll be here soon!
But a computer wiz like yourself needs to move that last Kirby post to the AM pages...be a great place to put it for future referrence
If your are using dies made with the chamber reamer you really are not sizing anything, much less FL sizing. They should have been cut with a resize reamer that is undersize slightly on the body and shoulder to give you some sizing, otherwise you cannot squeeze something down with a die the exact same size as the brass.
Jim Carstenson has a very good article on this very thing. He is just one of many that have discussed this.
Full-Length Bushing Dies and Die Conversions
Roy, The 260 Kirby is building is for me and the 270 he is building is a gift that I am giving to my son. Have always wanted a custom built rifle and so has my son ... so ... Im getting them for us. I am too old for it to do me much good but at his age he has life time ahead of him to enjoy a good rifle.
BH --- good catch! The Wilson seating dies are cut with the finish reamer. Resize reamer is used for the sizing dies and to rough the chamber.