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Reloading Techniques For Reloading


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neck size or full length size?????

 
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  #15  
Old 12-17-2009, 07:52 AM
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Re: neck size or full length size?????

Neil jones dies are great along with a custom die from your smith off the resize reamers.

However, you might have another much cheaper option if a standard case.

buy a Redding body bump dies ($25) and send it to Jim Carstenson at JLC Precision along with 10 cases fired 2x.

For about $80 he will convert the body die to a custom honed to your chamber FL bushing size die that uses Redding bushings. Turn around is normally less than 2 weeks.

Jims info is at www.6mmbr.com under the "Tools" section

I more than a few of Jims dies and work great.

BH
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  #16  
Old 12-17-2009, 11:48 AM
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Re: neck size or full length size?????

I full length resize with a FL bushing die. Set it up to bump the shoulder and use a bushing to give 2-3 thou neck tension. No sizing button used. Also trim my necks to clean them up. This process seems to work very well for me.
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  #17  
Old 12-17-2009, 01:32 PM
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Re: neck size or full length size?????

I neck size only until the brass is tight to chamber, then throw it away and start with new. Usually get 9-10 loadings from it.
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  #18  
Old 12-18-2009, 01:01 PM
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Re: neck size or full length size?????

Quote:
Originally Posted by Freebore View Post
I full length size enough to just bump my shoulder back .001- .002 on ALL of my cartridges. My customs shoot 'bug holes' at 200, my factory's shoot very well too. Good brass is a must. I'm a firm believer in annealing too especially in my big 30 cal after 3-4 firings.
I agree with the above (except I don't anneal YET lol), I have been doing this for the past year, and have shot some great groups. It does make a difference as to what dies you are using tho. Usually as a rule, FL sizing slightly reduces brass life. But... in a hot caliber (if you neck size) you're going to have to bump the shoulder every couple of shots anyway. Why not take care of it all at once and keep it consistent shot to shot.

You can get a set of Hornady FL dies custom made for a decent price, you need to send them some once fired brass. Just something you might want to look in to.

Good luck.
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Last edited by bowhunthard; 12-18-2009 at 01:06 PM.
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  #19  
Old 12-18-2009, 11:33 PM
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Re: neck size or full length size?????

I full length size with a die whose neck's been lapped out to a couple thousandths smaller than a loaded round and set the fired case shoulder back just 2 thousandths. (Depriming then cleaning cases before sizing them.) With several barrels in .308 Win., I get 40+ reloads per case without annealing. Two 30 caliber belted magnums and two barrels each, got 15 to 20 reloads per case, but these had to double sized; second time with a body-only die that sized just the case body completely to the belt down to about new case diameters to get rid of that tiny ridge right in front of the belt. New belted cases shoot just as good. All ammo's shot in standard SAAMI chambers. Accuracy with the .308's been 1/3 MOA at 300, 1/2 MOA at 600 and 3/4ths MOA at 1000 for 20 shot test groups. 30 caliber magnums' tested only at 1000 yards, 3/4ths MOA for 20 shot groups. Never had to anneal a case neck.

Smallest 15+ shot test groups at 600 and 1000 yards I know of have all been shot with cases full length sized as above. Most of 'em are smaller than bench rest records for the same number of shots.

Sierra Bullets been full length sizing all their cases used to test bullets. They now use Redding Full Bushing Dies for calibers they're available in otherwise standard Redding full length dies.

If one checks how rimless bottleneck cases sized neck only or full length fits the chamber when fired, they'll learn the difference is negligable and it's only at the back end of the chamber. Up front, they're the same.

I tried various form of partial neck sizing such that the case headspace is a tad longer than chamber headspace; the bolt very slightly binds as it closes on the case. Never got good accuracy this way, especially with bolts whose face ain't squared with the chamber axis. However, this method typically produces better accuracy than full length sizing where the fired case shoulder's set back too far.
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  #20  
Old 12-19-2009, 10:39 AM
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Re: neck size or full length size?????

Quote:
Originally Posted by Bart B View Post
I full length size with a die whose neck's been lapped out to a couple thousandths smaller than a loaded round and set the fired case shoulder back just 2 thousandths. (Depriming then cleaning cases before sizing them.) With several barrels in .308 Win., I get 40+ reloads per case without annealing. Two 30 caliber belted magnums and two barrels each, got 15 to 20 reloads per case, but these had to double sized; second time with a body-only die that sized just the case body completely to the belt down to about new case diameters to get rid of that tiny ridge right in front of the belt. New belted cases shoot just as good. All ammo's shot in standard SAAMI chambers. Accuracy with the .308's been 1/3 MOA at 300, 1/2 MOA at 600 and 3/4ths MOA at 1000 for 20 shot test groups. 30 caliber magnums' tested only at 1000 yards, 3/4ths MOA for 20 shot groups. Never had to anneal a case neck.

Smallest 15+ shot test groups at 600 and 1000 yards I know of have all been shot with cases full length sized as above. Most of 'em are smaller than bench rest records for the same number of shots.

Sierra Bullets been full length sizing all their cases used to test bullets. They now use Redding Full Bushing Dies for calibers they're available in otherwise standard Redding full length dies.

If one checks how rimless bottleneck cases sized neck only or full length fits the chamber when fired, they'll learn the difference is negligable and it's only at the back end of the chamber. Up front, they're the same.

I tried various form of partial neck sizing such that the case headspace is a tad longer than chamber headspace; the bolt very slightly binds as it closes on the case. Never got good accuracy this way, especially with bolts whose face ain't squared with the chamber axis. However, this method typically produces better accuracy than full length sizing where the fired case shoulder's set back too far.
How do I know and measure my shoulder to see if it is set back to far?
What kind of tool do you use?

Thanks

Bigbuck
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  #21  
Old 12-19-2009, 10:47 AM
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Re: neck size or full length size?????

Quote:
Originally Posted by bigbuck View Post
How do I know and measure my shoulder to see if it is set back to far? What kind of tool do you use?
I use an RCBS Precision Mic. Hornady and others also make tools that does the same thing.

Fired cases are put in the tool and the case headspace (head to shoulder reference, or datum) from case head to shoulder is measured. After full length sizing, the sized case is measured to see how much shorter the case headspace is.

Any more than 2 thousandths shorter is too much. You'll get a 1 thousandths spread across your cases if they're lubed uniformly. Other wise, too little lube results in not enough shoulder setback and to much lube lets the shoulder get set back too far.

Redding sells shell holders in 2 thousandths steps over the standard so one that lets your die just touch it at the top of the ram's stroke will result in uniform fire case head setback.
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