Will 124 grain gold dots expand? - MP-Pistol Forum

Will 124 grain gold dots expand?

This is a discussion on Will 124 grain gold dots expand? within the MP Compact Pistols forums, part of the Smith & Wesson MP Forum category; Will 124 grain gold dots expand reliably in the M&P 9c 3.5 inch barrel? These are not +P's they are just standard pressure....


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Old December 3rd, 2016, 05:10 PM   #1
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Will 124 grain gold dots expand?

Will 124 grain gold dots expand reliably in the M&P 9c 3.5 inch barrel? These are not +P's they are just standard pressure.
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Old December 3rd, 2016, 09:46 PM   #2
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It depends on the velocity they are loaded to. If you want to know a standard pressure load that will expand reliably, there is plenty of information available.

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Old December 4th, 2016, 07:21 AM   #3
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VS', This probably isn't what you want to hear, but when I started carrying a 3" 1911 I decided to test various loads on my own. Now I don't have ballistic gelatin and didn't want to be bothered keeping it at the proper temp' and such. What I used were 1 gallon milk jugs full of water. I figured that if a bullet expanded in water it ould expand in denser tissue. I also tested the same loads out of a 5 " barrel. Many loads that expanded out of a 5" didn't expand out of the 3". Where I'm going with this is by way of suggesting your own testing out of your gun.

My setup was easy... 3 1 gallon jugs lined up and separated by about an inch, with a backer behind all 3. I used a very thick catalog as a backer. Yes, the catalog will get used because when a bullet doesn't expand it acts like a FMJ and just plows right through the jugs. I couldn't tell for certain the exact penetration I was getting, but I could tell within a general range. But I could definitely see the expansion.

If the gold dots are made in a short barrel version, as the .45s were, that's the one to test in Gold Dots. They are made for lower velocity expansion. I also found some ordinary plain Jane bulk ammo to perform very nicely, so that's worth testing also. My results were in .45ACP so I won't discuss specific loads as they'd have no carry over to 9mm.

I haven't done that full sort of testing of many different loads in 9mm.
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Old December 4th, 2016, 09:11 AM   #4
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I've seen a bunch of the ammo quest videos. I just curious since this pistol has a 3.5 inch barrel and those only have 3's. And the gold dots do expand reliably out of a glock 19 which again is only a half inch difference to my pistol. Think I may ultimately end up getting the 4.25" barrel and put it into it. Also I really don't have a way to test and see if my ammo will expand I have to go to a indoor range to shoot. I know HST's are great performers out of the 3 inch guns and I may end up just switching to those.
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Old December 4th, 2016, 10:43 AM   #5
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Old December 5th, 2016, 08:25 AM   #6
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Quote:
Originally Posted by vsmith View Post
I've seen a bunch of the ammo quest videos. I just curious since this pistol has a 3.5 inch barrel and those only have 3's. And the gold dots do expand reliably out of a glock 19 which again is only a half inch difference to my pistol. Think I may ultimately end up getting the 4.25" barrel and put it into it. Also I really don't have a way to test and see if my ammo will expand I have to go to a indoor range to shoot. I know HST's are great performers out of the 3 inch guns and I may end up just switching to those.
A 4 1/4" barrel won't lock up properly at the muzzle in a 3 1/2" slide.
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