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 Case resizing vs leave it alone?
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Advanced Member

177 Posts

Posted - 07/15/2018 :  10:23:58 PM  Show Profile Send Satanta a Private Message  Reply with Quote
I'm going to step past my pay grade and low knowledge grade also.
I've been reloading my carbine loads now for a spell.
My love for carbines took me to another level with the 45-70 Springfield trap door carbine. Been reading a lot per reloading.
This site: hope it's received.
You must be logged in to see this link.
One part stuck in my mind.
Don't resize if using the same rifle. Cases swell, seal and fit that chamber. The perfect fit from my own words.
Head space is critical with the M1, so check and trim if needed.
I (we) always try and separate our once fired, three times fired brass etc. Why not separate one from another and avoid the resizing step that makes the case round usable for all?
Just asking. But why not re-use the same brass that has already been form fitted to the chamber for that carbine?
My first concern would be of course. What brass came from which M1.
That would be your choice and your guess.
The question is: Why resize? Trim and check case length? 100% on that.
Whole different ball game I'm sure. But in theory, I had to ask.
I myself have been reloading and trying different loads for the best possible MOA. I do realize the the carbine was not built for accuracy.
But anything and everything can be improved on, including the perfect case to chamber fit. ????
I watch and read all the time. Different loads, powders, primers, seating depth, etc... It's a game of test and try with $ spent.
Yet I have never seen anything on this subject till I found the site that is above.
It just makes perfect sense to me. But I'm sure I'm missing something.
That's why I came to my homeboy pro's.
The perfect case made to fit for that carbine, plus the trim for head space of course.
It just seems like a great place to start before all the other mix.
Looking forward to hearing all input.

Advanced Member

369 Posts

Posted - 07/16/2018 :  08:47:56 AM  Show Profile Send americanboy a Private Message  Reply with Quote
There may be some out there that don't, like the Lee beat-n-bang one-at-a-time, but all the dies I know of automatically resize at one or more steps in the process. Of course, one could always figure out ways to remove the primer without a die. It may just be more trouble to not resize that it is to resize?
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Junior Member

88 Posts

Posted - 07/16/2018 :  09:09:27 AM  Show Profile Send daboone a Private Message  Reply with Quote
Resizing/trimming for any semiauto rifle is IMO a safety concern. What if just one case was just a little over chamber size and didn't fully chamber when the firing pin connected to the primer? Better safe that shaving the MOA by decimal points. It's an M1 Carbine not a tack driver. But then beer can MOAs are fine for my hunting and plinking needs.

If I was to do this I'd chamber one round at a time by hand.
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Veteran Member

1070 Posts

Posted - 07/16/2018 :  09:22:00 AM  Show Profile Send Jackp a Private Message  Reply with Quote
Great article! I don't reload but I do shoot BR50 with my Russian .22LR. The article gave me a lot to think about when it comes to bullet shape, lube consistency and lube groove location. This may be especially critical on a light, low velocity projectile like a .22LR.

One question though about not resizing. Forgive my ignorance since I don't reload. What happens if the chamber is not perfectly round? I know that some of my fired cases are extremely tight if later reinserted into the same chamber. So tight that they are likely to cause jams if not resized.


Edited by - Jackp on 07/16/2018 09:23:32 AM
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3168 Posts

Posted - 07/16/2018 :  10:27:18 AM  Show Profile Send jimb16 a Private Message  Reply with Quote
With a straight necked case, neck sizing only is fine. Please remember that the carbine case is tapered. Without resizing it is doubtful that you can get enough neck tension to keep the bullet in place. If the bullet gets set back into the case you could have some serious pressure excursions. I wouldn't forgo FL sizing on any tapered case simply because you won't have enough "neck" length to hold the bullet securely.

OGCA Lifer,NRA Life member, son of a 325th GIR Glider Rider
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Advanced Member

177 Posts

Posted - 07/17/2018 :  06:09:12 AM  Show Profile Send Satanta a Private Message  Reply with Quote
All very good points and that's why I ask. Had to ask, and I'm sure in some situations, that would work and pan out well and safely. Thanks everyone for their input.
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