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Problems chambering my reloads

This is a discussion on Problems chambering my reloads within the Ammunition forums, part of the M14 M1A Forum category; I asked about the crimp because sometimes trying to roll crimp will actually bell the case neck, that's also why I suggested chambering a resized ...


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Old May 10th, 2017, 12:54 PM   #16
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I asked about the crimp because sometimes trying to roll crimp will actually bell the case neck, that's also why I suggested chambering a resized but unloaded case. In reality, loading 168's, you don't need to crimp at all if you have proper neck tension. I used to be paranoid about crimp, but not any longer.

I use the same Wilson case gauge... but it's a quicky tool, and may or may not help you with the problem you have. My fired cases, oddly enough, drop right into my case gauge... before sizing. No lie. In your case, as someone mentioned, you might have a very tight match chamber.

Also... when you set your resizer to 'kiss' the shell plate... check it again when you actually have a case fully into the die. I ran into a problem where I would set it, but once I rammed a case up into the die, there would be a gap between the die and shellplate... because of tension on the pivot pins.

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Old May 10th, 2017, 01:06 PM   #17
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When actually sizing a case, LOOK to see how much clearance there is between the bottom of the die and the shell holder.

It's common to lower the die further inorder to get the base of the case pushed futher up into the die.

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Old May 10th, 2017, 01:39 PM   #18
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Check your case neck thickness. I had to turn some LC machine gun brass because the neck was about .010 to thick. And welcome.

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Old May 10th, 2017, 02:25 PM   #19
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Is the chamber on your rifle 7.62MM NATO or .308?
Either way. You are not setting the shoulder back far enough.
Are you checking case OAL after sizing?
Get a case gauge to match the type of chamber you have.
https://www.midwayusa.com/product/88...308-winchester
FWIW: I have never needed a S/B die for a M1a cut to .308 or 7.62mm chambering.
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Old May 10th, 2017, 02:29 PM   #20
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Quote:
Originally Posted by CJJones87 View Post
I will have to double check the die adjustments but I know I set them up per the RCBS directions which had me screw the die into the turret until it was just above the shell holder. So based on what you guys are saying to make it touch the shell holder, lower the shell holder and give it another half turn or so, that will definitely make a difference as I know mine is not set up that way. I have the Lee full length die adjusted the same way, adjusted to be just above the shell holder at the end of its stroke.
Maybe your instructions are different than mine, but I suggest you go reread them. I just checked my Lee die instructions & my RCBS SB die instructions & they both say to adjust sizing die down until they contact the raised shellholder, then lower the ram, then lower (not raise) the die a bit (Lee & RCBS lower them different amounts). Adjust your dies down a bit like others have suggested & I suspect your problem will be solved.

Quote:
Originally Posted by CJJones87 View Post
I do have the Wilson go/no-go gauge for the cases. All 20 of the rounds I loaded seemed to fit just fine without getting stuck or protruding from the end indicating it needs to be trimmed.
When you drop your resized case into the gage, where is the base? Is it between the steps, or is it a bit proud of the top step like I suspect? Again, adjust your die down a bit & the base should fall between the steps of the big end of the case gage.

Machinegun brass pushed me into purchasing a Wilson case gage & RCBS SB dies. The SB die solved the problem (used just for the first resize, & I use the old Lee dies for subsequent resizing). The Wilson gage is a fast/easy QC check for a resized case &/or assembled round.

You shouldn't need to resize with the Lee die, then the RCBS SB die once you have them properly adjusted, but I don't suppose it hurts anything. also I don't think your crimping/not crimping is affecting your situation because your problem is at the shoulder or below, not the case neck (your clear description of your problem supports that conclusion). I tend to agree with others that a crimp shouldn't be needed on magazine fed bottleneck cartridges, but I have in the past used the Lee factory crimp die to solve loose neck problems.

I think you have all the tools you need, you just have to get your resizing die set right.

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Old May 10th, 2017, 06:30 PM   #21
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Thanks for all of the info everyone. Adjusted my die so that it actually touches the shell holder, plus half a turn. The new rounds are chambering much better. Sized a few pieces of brass first and tested those as Smoothy had suggested and they fit much better. May screw the die in another quarter of a turn as the op rod does not pull back quite as effortlessly as with the M80 round, but very close. I have no doubt that the action will cycle but I want the op rod to pull back just as effortlessly as the M80 round with nothing but op rod spring tension resisting it. I can tell that my rounds are still just a hair tighter of a fit in the chamber than the M80 round, but again, I have no doubt that the action will cycle with the current fitment. I will attach a picture of my RCBS instructions, but per their directions :

Lower the press handle, raising the ram to the top of the stroke. Thread the expander die body down into the press until it is just above the shell holder, lock the die lock ring.

I believe the instructions beyond that point only pertain to setting the expander plug. Again, thanks everybody for your help
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Old May 11th, 2017, 05:55 AM   #22
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No need to go 'overboard' on lowering the resize die.

Even with a SB resize die, the diameter of the resized case might not be as small as new commercial or USGI.

Firmly seat a resized case in the chamber with firm thumb pressure. If the case can be removed with an 'easy flick' of fingernail or small screwdriver, then it's OK.

Also place a resized case in the chamber and ease the oprod forward. Then with moderate thumb pressure on the oprod, close the bolt and make sure it has rotated fully closed. A moderate pull on the oprod should be enough to extract the case. If it feels like the face of the bolt is jammed against the base of the case, then lower the die just a little bit.
Doing those tests with the bolt stripped of internal parts is best to feel how it's operating. But I do it with fully assembled bolt.

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Old May 11th, 2017, 06:07 AM   #23
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Quote:
Originally Posted by CJJones87 View Post
...
I will attach a picture of my RCBS instructions, but per their directions :

Lower the press handle, raising the ram to the top of the stroke. Thread the expander die body down into the press until it is just above the shell holder, lock the die lock ring.

I believe the instructions beyond that point only pertain to setting the expander plug. Again, thanks everybody for your help
----------------------------------------------
Those instructions are ONLY for a case mouth expander die.
They do NOT apply to the resize die.

I think most people do not use a neck EXPANDER die with bottleneck rifle cases and jacketed bullets.
The resize die and its expander plug resizes the neck so the bullet has to be forced in, and is held securely. If you ARE using an expander die, then crimping probably is needed.

When I resize cases I use a Q-tip with some lube on the inside of the case neck. That allows the expander plug to slide out much easier, and reduces possible case stretching when pulling the expander out of the neck.

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Old May 11th, 2017, 08:33 AM   #24
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Quote:
Originally Posted by JayKosta View Post
Those instructions are ONLY for a case mouth expander die.
They do NOT apply to the resize die.
Yup. Go back two columns & read "sizing with steel sizer dies"; that's how you should start out with your SB sing die.

That said, sounds like you about have it figured out.

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