Redding Type S Bushing Dies - Help w/ Purchase

Been doing this a long time.

Measure the neck of a loaded round, 5 is even better. Get an average of what the thickness is.

Now, order bushings -.002 & -.003 smaller. You will see a difference in how a gun groups with the different size of bushings. I have one rifle that shoots slow powder that uses a -.004 bushing.

I always start off with the -.002 and go down from there.

You won't know....till you know.
 
The problem I've been having is determining the correct bushing size. I have a bunch of once fired FGMM 300WM brass. I also have 500 pieces of brand new Winchester 300WM brass (never fired/never loaded). How does a guy determine the bushing size only having this brass to work with? The FGMM casing having been fired through the rifle that all the casing will be run through.
 
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I'll have to disagree with CatShooter. He stated that the 220 swift will never have to have the shoulder bumped back.
This is simply not true. The brass grows in length every time you shoot it. When the brass starts chambering hard, you bump the should back.

BP



What you are talking about is NOT bumping the shoulder - you are talking about FL sizing.

Not the same thing.

I have had two Swifts, and never had to bump the shoulders. It is because of the shape of the shoulder.

.
 
Quote:
The problem I've been having is determining the correct bushing size. I have a bunch of once fired FGMM 300WM brass. I also have 500 pieces of brand new Winchester 300WM brass (never fired/never loaded). How does a guy determine the bushing size only having this brass to work with? The FGMM casing having been fired through the rifle that all the casing will be run through.



I do what Ackleyman said,,, but in your case,,, just measure some fired cases (Check several for an average) and order a bushing two thou smaller.
Like others have said,,,"you may have to go up or down one or two thou." but that'll get ya close..
 
The problem I've been having is determining the correct bushing size. I have a bunch of once fired FGMM 300WM brass. I also have 500 pieces of brand new Winchester 300WM brass (never fired/never loaded). How does a guy determine the bushing size only having this brass to work with? The FGMM casing having been fired through the rifle that all the casing will be run through.


It's generally not easy to determine the correct bushing based on just the fired case. If the neck diameter in your chamber is on the big side of the spec, .002 diameter reduction will likely not give you enough bullet tension. Variations in neck hardness will also affect how much diameter reduction is done in a bushing. It is much easier to measure loaded rounds that demonstrate adequate bullet tension and go .002-.004 under that. Another way to get a starting point is: determine the average neck wall thickness, X 2, + the bullet diameter, - .002-.003

If you use bushing dies long enough on more than one headstamp, you will find that you need about 3 to cover the range of case neck thickness. This assumes your not turning your case necks.
 
+1 to what sodak said. Measuring the thickness of the brass of your neck wall of a fired case has nothing at all to do with selecting the proper bushing size. You don't, in reality, ever have to even know the thickness of your case neck.

Seat a bullet into one or two of the same cases you intend to use. Measure the diameter across the neck of the "loaded" round. Buy a bushing .002" under that.

Sometimes you'll run across a load that prefers less, or more, neck tension, but for starting off.......ascertaining a pretty correct bushing size is a simple matter of measuring a round loaded in your intended cases.

Mike
 
This post came at a perfect time for me, since I'm in the same boat. Maybe my data ans questions can help to calrify for everyone, including myself...

I'm having a .17P built, but the smith has not yet cut the chamber. I will be using necked down .223 Lapua brass. I measured almost 50 cases and the necks are suprisingly uniforn, measuring between .0135 and .0145 on my calipers. I want to turn the necks down just a bit to insure uniformity, but don't want to take too much meat off either...

That said, if I neck turn down to .0125, then I should end up with a .197" loaded round diameter. (.0125 + .0125 + .172) Based on .197" loaded round measurement, I will need a .195" bushing for my Type S neck die, right? And being that my brass will all be turned true, my smith can chamber my barrel with a .198" (tight) neck, just big enough to allow for some brass expansion...

Does this sound kosher to you fellas 'in the know'???
 
Quote:
This post came at a perfect time for me, since I'm in the same boat. Maybe my data ans questions can help to calrify for everyone, including myself...

I'm having a .17P built, but the smith has not yet cut the chamber. I will be using necked down .223 Lapua brass. I measured almost 50 cases and the necks are suprisingly uniforn, measuring between .0135 and .0145 on my calipers. I want to turn the necks down just a bit to insure uniformity, but don't want to take too much meat off either...

That said, if I neck turn down to .0125, then I should end up with a .197" loaded round diameter. (.0125 + .0125 + .172) Based on .197" loaded round measurement, I will need a .195" bushing for my Type S neck die, right? And being that my brass will all be turned true, my smith can chamber my barrel with a .198" (tight) neck, just big enough to allow for some brass expansion...

Does this sound kosher to you fellas 'in the know'???



Sounds OK - but wait ( - never type before coffee) until the rifle is chambered before you start turning and ordering bushings...

... somfin about good plans of meeces and men and such.

And leave yourself 2 thou clearance.

.
 
gotcha...
Didn't account for .001 all around, so .199 for the chamber. (Tell me 'bout da rabbits, CAT, tell me again...) /ubbthreads/images/graemlins/smile.gif

How skinny is too skinny on the necks? I don't want to trim them "just because"...

Would it be safe to conclude that, in an "ideal situation" involving neck turning brass to size, a custom chamber should be +.002 and neck bushing size should be -.002 to -.004 below the loaded round's neck diameter? With the negative values being attributed to neck tension holding the bullet in place.

Would it be wise to use slightly more neck tension for loading for a hunting rifle, as opposed to a bench/target rifle that would be handled with more care?

Sorry for the hijack, but thought this might be relevant...
 
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gotcha...
Didn't account for .001 all around, so .199 for the chamber. (Tell me 'bout da rabbits, CAT, tell me again...) /ubbthreads/images/graemlins/smile.gif

How skinny is too skinny on the necks? I don't want to trim them "just because"...

Would it be safe to conclude that, in an "ideal situation" involving neck turning brass to size, a custom chamber should be +.002 and neck bushing size should be -.002 to -.004 below the loaded round's neck diameter? With the negative values being attributed to neck tension holding the bullet in place.

Would it be wise to use slightly more neck tension for loading for a hunting rifle, as opposed to a bench/target rifle that would be handled with more care?

Sorry for the hijack, but thought this might be relevant...



After my last "bout" with neck turning, I swore to never do it again, unless I "acquired" a tight neck... which I would probably punch the neck on, rather than turn.

... but if you really feel like you need to clean up the necks, just skim them until 90-95% is clean - don't take a big bit out if them.

Anneal then necks after turning.

.
 
Thanks CAT. You are not the only one to have recommended against neck turning if it can be avoided.
Being that the brass is factory annealed Lapua and already very consistent, I may just opt for a 'no turn' chamber...

Thanks to all for the advice given in this thread /ubbthreads/images/graemlins/grinning-smiley-003.gif
 
Quote:
The problem I've been having is determining the correct bushing size. I have a bunch of once fired FGMM 300WM brass. I also have 500 pieces of brand new Winchester 300WM brass (never fired/never loaded). How does a guy determine the bushing size only having this brass to work with? The FGMM casing having been fired through the rifle that all the casing will be run through.



I went to the local sport center with my calipers and used new factory rounds
to measure. The guys didn't mind at all.
 


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