Resizing Question

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VandalBC

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Sorry if this has been asked before but I could find anything on it.

I reload for my Rossi M92 in 45LC. Since it is the only gun these rounds are used for is it necessary to resize them since they have been fire forged for that gun or is that the case only with bolt action rifles? TIA
 
Yes, you need to (a) size the case (and mouth) back to nominal/uniform roundness with a tight bullet fit; and (b) expand/flare the mouth back to appropriate diameter to accept/hold the bullet firmly (even before you crimp).

(Get a loose bullet fit in a tubular magazine, and you're into all sorts of excitement if/when the bullet is shoved into the case from tube/spring force)
 
I can just expand the mouth of the case to easily accept the bullet without resizing the case then always put a crimp on it, it's a lever gun.
 
Texas10mm said:
Nope. You won't have any neck tension.

But it seems you have made up your mind.

Good luck.
Click to expand...

Nope, just trying to understand. Seems like you've already made up your mind but thanks for the info.
 
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I guess this is kind of what I was asking. This is from the Starline Brass website. Have any of you done it this way?
Sizing Cases
When loading some handgun calibers that require a lot of neck tension, or calibers that use a wide range of bullet diameters, you may be required to size your new cases prior to the first loading to achieve proper bullet tension. When doing this, it is generally not necessary to full length size the brass; you can just adjust the sizing die up to the point where it is only sizing 3/8 to 1/2 inch of the case mouth. This will require much less force than full length sizing and will also save your brass from any unnecessary work hardening.
 
If you know the answer, why ask the question? Several folks answered your query with the correct info which you do not seem to like. Try it your way and see what happens and try it the other way and see what happens and then decide which way works best for you.
 
No crimp can make up for lack of neck tension, so you need to size the case, then expand it just enough to let the bullet enter the case mouth easily.

Then add a nice crimp into the middle of the cannelure.

The article is correct, and I size all new pistol brass anyway, not that it is always needed.
 
The Starline article is describing partial resizing.

This has worked well for me with standard pressure and tier 2 (~20kpsi) 45Colt loads. Once you reach Ruger only levels however, the brass doesn't spring back enough and will require FL sizing for easy chambering.

If you don't size at all, as stated earlier, you won't have any neck tension. And also as stated earlier, no amount of crimp can make up for poor neck tension.
 
LiveLife said:
When a friend bought a Henry lever action chambered for 45Colt, I bought new brass from Starline.

I full length resized the brass which reduced the OD to smaller than factory and for more consistent internal case volume for more consistent chamber pressure build.
Click to expand...

OK, so I've full length resized the brass even when it was new but how do you reduce the OD?
 
MEHavey said:
Resizing's whole function is to reduce OD to SAAMI (nominally min) spec.
Click to expand...
OK, sorry, I'm just trying to understand something I read in a reloading manual. It talked about fire forged brass and only resizing the neck of the cartridge and I was wondering if it would be the same for a pistol cart like a 45LC if the brass was always used in the same gun. Does the brass expand a bit more after it is ejected from the gun that's why you would need to full length resize it? Sorry my wording in the beginning obviously pissed some people off.
 
The main reason for full length sizing is that lever actions, revolvers, and automatics don't have the extraction power of a bolt action. Tight going in, tighter coming out, maybe too tight. Some posters are getting by with partial sizing, I don't take the chance.
 
Jim Watson said:
The main reason for full length sizing is that lever actions, revolvers, and automatics don't have the extraction power of a bolt action. Tight going in, tighter coming out, maybe too tight. Some posters are getting by with partial sizing, I don't take the chance.
Click to expand...

Ahh, gotcha, make sense now. So reducing the OD by just a bit smaller than factory could actually help a bit. Thank you.
 
VandalBC said:
I'm just trying to understand something I read in a reloading manual. It talked about fire forged brass and only resizing the neck of the cartridge and I was wondering if it would be the same for a pistol cart like a 45LC if the brass was always used in the same gun.
Click to expand...
As far as I know, neck sizing only applies to bottle neck rifle cartridges with tapered body. And since the cartridge body is tapered, extraction is less of an issue when fired case is reloaded for the same chamber and unsized case produces more consistent chamber pressures for greater accuracy.

With straight walled pistol/rifle cartridges like 45Colt, extraction is an issue and full-length resizing reduces outside diameter of brass that expands to seal with the chamber but due to inherent characteristics of brass, shrink back to resized dimension (brass pulls away from chamber walls) for easier extraction instead of hanging up with the chamber wall.
 
Oh man this was a hard read , so much to say but don’t want to come off all snarky so I’ll wait and see if I can compose my self haha .
 
I always resize and measure all brass and trim if needed. Just to make sure I'm getting the proper seating depth and all my crimps are uniform.
 
As already stated, neck sizing only is for bottle neck cartridges.

I always resize all of my straight wall pistol cases, even new brass. While Starline brass is good stuff, it definitely needs resized when new.
 
Bill M. said:
What would the point of not resizing them be?
Click to expand...

As I said earlier I was reading about fire forged brass and was wondering if it could apply to a straight walled pistol cartridge like a 45LC. I was trying to understand why it wouldn't and some folks were very helpful and others were not. Some insisted that you must do a full length resizing and others said only a partial resizing. The Starline Brass website says something different, contrary to what some said here Starline Brass says their brass is good to go when new, no resizing required. Whether is does or not I resized it before using it and will continue to full length size my brass because of some of the info I got here.
 
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