45 Shield doesn't like lead RN reloads - MP-Pistol Forum

45 Shield doesn't like lead RN reloads

This is a discussion on 45 Shield doesn't like lead RN reloads within the MP SHIELD Pistols forums, part of the Smith & Wesson MP Forum category; Have a new 45 Shield that is a great gun that functions perfectly in all ways but one. It does not like my lead round ...


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Old February 26th, 2017, 09:26 AM   #1
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45 Shield doesn't like lead RN reloads

Have a new 45 Shield that is a great gun that functions perfectly in all ways but one.
It does not like my lead round nose reloads (that function perfectly in all my other .45s)
When cycling, or when you pull and release the slide, many times the gun does not go into
battery. Slide stays to the rear about 1/8 inch. You can slam it home with your hand, but
who wants to do that. I repeat, the gun works fine with factory or ball reload ammo.


Thanks for listening.......
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Old February 26th, 2017, 10:20 AM   #2
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Are you using a taper crimp on your 45 reloads?

What is the OAL on your 45 loads?

Have you tried a different bullet?
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Old February 26th, 2017, 11:43 AM   #3
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Yes, not sure of over-all lenth, only that they all function in my other 45's. I just seated the bullets
deeper and they seem to be better. I think the 45 Shield may have a very short lead from the cham-
ber to the rifling as I have seen this problem with another 45 Shield with the same type of bullets.
(Not my loads, but they looked fine)
I will run the rest of the batch back thru the seating die and it may cure my problem.

Thank you again
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Old February 26th, 2017, 03:36 PM   #4
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Just be careful, as you seat the bullets deeper the pressure goes up.

A lone time ago I got some Rainier plated 45, 230 gr RN bullets, they had just come out, so I loaded up a bunch at my standard load of 5.0 gr of 231, now that's a light load, I've been using it for many years, loaded many thousands of them. The dies were already set for 230 gr RN so they were ready to go.

Took them out to shoot, hmmm those feel really snappy, picked up the cases and most of them had blown the primer's right out of the pocket! The ones that weren't blown out were incredibly flat, the pressure is through the roof! I pulled some bullets and checked the powder charge, it was right where it was supposed to be, I couldn't figure out what was going on, this was before the internet, so I couldn't go there for ideas. I started loading test batched at lower powder charges, I finally went down to 3.0 gr before the pressure signs went away, I had almost 1,000 left to shoot.

Years later I thought of that and started asking around for ideas, almost everyone said seated too deep, that was crazy since I seated those at the same depth as all the others. I had 50 left that I had never loaded, so I loaded up 10 at my standard 5.0 gr, but seated them out longer than normal, then went to the range, those primers were really round like a really soft load, the only difference was the seating depth! I don't know about now, but those were shaped a bit different, at my normal OAL they were seated deeper inside the case, so there was less room inside. Lesson learned, seating bullets deeper can make pressures skyrocket, even a little difference in seating depth can make a big difference in pressure.

This isn't mine, but its what the ones that hadn't blown the primer out looked like, just by seating the bullets slightly deeper.
Attached Images
File Type: jpg flat%20primer.jpg (5.6 KB, 10 views)
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Old February 26th, 2017, 07:05 PM   #5
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My 230gr LRN loads work as well in my 45 Shield as they do in all my 1911's.

As you note; your COAL may be just a bit long.
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Old February 26th, 2017, 07:25 PM   #6
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Do they pass the plunk test?

If not then one or more of the following:

Too long

Not resized properly (M&P chamber might be tighter than other guns)

Crimp not sufficient
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Old February 27th, 2017, 07:23 AM   #7
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I reload lead 45ACP and have failure to full seat/fire mostly with striker fired handguns. Lube and firing residue in barrel throat is the problem for me. In my 1911's I use a 18 1/2 lob recoil spring to overcome the residue. In striker fired guns it seems to be much more of a problem.
For Self defense, I use jacked HP and for range use I use lead

Last edited by lashlaruhe; February 27th, 2017 at 07:26 AM.
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Old February 27th, 2017, 06:19 PM   #8
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Had an issue with my old XDS 9mm like this, I was on the upper end of the OAL, I moved my OAL to the middle range and the problem was solved.
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Old March 2nd, 2017, 02:13 PM   #9
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Test fired adjusted re loads yesterday and the problem appears to be solved.

Thanks for the tips and interest.
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