10mm and 38 Super: advantages

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And if the 9mm breech face won't accommodate traditional 38 super, it may be able to handle 38 Supercomp or 38 TJ (which are basically un-semi-rimmed 38 super cases). Both of those are available from Starline, as well as other brass makers, and some competition guys like them for various reasons.
 
How about the other way around? I have a Dan Wesson Guardian in 9mm that, depending on the cost and difficulty, might also want to use for 38 Super. It's obviously not a necessity, just something I would do for the fun of it.

I would wager yes, especially since they make the Guardian in .38 already.

I inquired a while back about converting my Valkyrie and DW said they could fit me a barrel for $130 (I think) plus the cost of a mag and possibly springs.
 
My favorite gun at the moment is 1976 vintage Colt Combat Commander in .38 Super that I recently acquired. Did I need it? Nope. But can't dismiss the cool factor.
 
Ok, sorry to be That Guy, but talking about 9mm conversions for a 38 Super is like thinking about buying a Ferrari and having someone say "And there's a kit available that will allow you to run on 4 cylinders for better fuel economy". It's just not a point.
I’d probably be more inclined to just download my ammo if I want lighter loads. But I’m always happy to have options.
 
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LRDGCO

Ok, sorry to be That Guy, but talking about 9mm conversions for a 38 Super is like thinking about buying a Ferrari and having someone say "And there's a kit available that will allow you to run on 4 cylinders for better fuel economy". It's just not a point.

Well I look at the 9mm. conversion as a means of using less expensive (and more plentiful), 9mm. ammo for practice at the range. It also gives me more versatility by being a convertible. If I had a Colt Government I could readily add a .22 conversion as well giving me three caliber options in the same gun.
 
TomJ

You can’t convert a 9mm to 38 Super, can you?

Typically the primary concern with the 9mm. to .38 Super conversion is with either shortening the 9mm. ejector so it will work with the longer .38 Super case or simply replacing it with a .38 Super ejector.
 
TomJ



Typically the primary concern with the 9mm. to .38 Super conversion is with either shortening the 9mm. ejector so it will work with the longer .38 Super case or simply replacing it with a .38 Super ejector.

Thanks. So it's not just a barrel swap, in which case I'll probably just leave it as it.
 
Getting 1300 fps from 125 gr 9mm loads or 1000-1100 fps for 147's is no trick and if I need more power than that I need a bigger gun.

This sums up my POV as well. I’m not a competitive shooter, so for me, a 9mm 124gr or thereabouts doing about 1200 does all I want from an auto. Anything more, I’ll just pick up a 357 revolver. As for the 10mm, my 45+P does 85% of what the 10 will do without breaking a sweat. I just don’t see the problem that the 10mm solves. YMMV.
 
Hadn’t considered the 9mm conversion. Good point!

I have a drop in 9MM barrel for my Colt .38 Super and didn't have to do a thing to make it work. (Running Super Comp brass) Plinking the 16" plate at 100 yards is pretty easy with either barrel. Run .38 Super, or cheap brass in 9MM. When I switch to 9MM it's my plinker load 125 Gr at 1050ish FPS. Brass just falls at my feet.

So mild to wild, but I use cheap/free 9MM brass for mild.

Colt Series 80 Enhanced .38 Super.
Colt Series 80 .38 Super With Storm Lake 9MM Barrel Pic 1.JPG
 
...............

Op did you get it!?!?!!?!
Boy I’ve gotta say this is one of most interesting gun transaction days I’ve ever had.

So I showed up with my trade goods and the gent I was dealing with asked what I’d like to get for them, and since they always have treated me great there I didn’t want to start too high. I gave him a price. And after a few seconds he said he thought I was shortchanging myself, and proceeded to offer me an extra $300 for all of it.

I don’t know that you get a more stand up person than that. So the bottom line is I ended up with over $2800 in store credit and a big damn smile on my face.

Then I started shopping, and yes.....

C59464BA-21A6-4ADE-8358-48091742CBE3.jpeg

I was hoping to walk out with the gun and maybe some loading equipment. Maybe I’d pick up a Sig P365 since they’re cheap too.

Well, I had plenty left for another nice gun.

I checked out several nice AR 10s, a Ruger Precision Rifle in 300 Win Mag, some Marlins and other lever guns. Then I started in on other handguns. Looked at a 5” 686 Talo, 6” Smith 629 half lug, a new Colt King Cobra, Ruger Redhawk in 44 mag, a few Legion Sigs and a CZ SP01.

Several of them spoke to me, but I’ve been lusting after a CZ Shadow 2 ever since I handled one about 6 months ago. I don’t yet own a CZ, and I’m thinking about joining a league. So I ordered one.

So I left the store with my new 38, a 9mm/38 Super shell plate for my press, and a quick change tool head and power drop setup for my Dillon 550B and didn’t pull out my credit card. On top of it I should have a Shadow 2 on the way and I’ll owe them about $50.

I’m happy. It was a fair trade and I’m going to have a hell of a lot more fun playing with these than what I traded.

Unfortunately no one had decent ammo or the powder I want. So since I didn’t spend any money, I can jump on Midway and get a case gauge and some v-N105, and maybe some bullets to load, I’ll get a set of dies from Dillon (I like their carbide dies. Work well), and 1000 pieces of brass from Starline.

So it’ll be a bit before I get to shoot it, but that’s ok. I’m patient.

I almost sprang for a very slightly used commander length bobtailed Nighthawk Custom, but the Dan Wesson just called to me. Couldn’t do both. It was very reasonably priced though and was a really nice pistol. Also handled an ED Brown. Also nice, but same deal. 38 Super was what I wanted.

Sorry if that’s more detail than anyone cares for, but I am just super pleased with how the transaction went and I had several great conversations along the way. That shop gets recommendation after recommendation from me to anyone I know who likes guns.

This gun is noticeably nicer than my Smith 1911 in fit and finish. It’s tighter also and has a nicer trigger. I see why it was twice the price. If it shoots straight I may trade my Smith&Wesson in for a bobtail commander 45 Dan Wesson.
 
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Glad you got it. Here are some suggestions;

Get Starline's 38 Super Comp brass. It's the 'rimless' version of 38 Super and will feed smoother than normal semi-rimmed 38 Super Auto. It also sets the standard for being the toughest brass available. The other option is Starline 38TJ (Todd Jarrett) brass. It is also rimless and has a slightly different extractor groove geometry, but functionally is nearly the same as Super Comp cases. It's also tough stuff.

If you insist on getting the semi-rimmed version (not a first choice) get Starline's 38 Super +P version, not their regular 38 Super cases. The +P cases appear to be as strong as the 38 Super Comp.

For super-accurate load data for the Super, see this article:

https://www.shootingtimes.com/editorial/super-accurate-38-super-loads/326242
 
Glad you got it. Here are some suggestions;

Get Starline's 38 Super Comp brass. It's the 'rimless' version of 38 Super and will feed smoother than normal semi-rimmed 38 Super Auto. It also sets the standard for being the toughest brass available. The other option is Starline 38TJ (Todd Jarrett) brass. It is also rimless and has a slightly different extractor groove geometry, but functionally is nearly the same as Super Comp cases. It's also tough stuff.

If you insist on getting the semi-rimmed version (not a first choice) get Starline's 38 Super +P version, not their regular 38 Super cases. The +P cases appear to be as strong as the 38 Super Comp.

For super-accurate load data for the Super, see this article:

https://www.shootingtimes.com/editorial/super-accurate-38-super-loads/326242
I appreciate that insight. I’m going to have s number of loading questions, but you just addressed the biggest one I have.

Also wondering about bullet diameter since there’s a 1000th of s difference between real 38 super bullets and 9mm Luger.
 
I appreciate that insight. I’m going to have s number of loading questions, but you just addressed the biggest one I have.

Also wondering about bullet diameter since there’s a 1000th of s difference between real 38 super bullets and 9mm Luger.

Ignore the .355 v .356 thing. Seriously. The 38 Super and 9mm have the same SAAMI 0.355 spec for barrel groove diameter. Actual barrel groove diameters in 9mm and 38 barrels run .355 to 0.357. Most 9mm are 0.356-0.357.

Most factory 38 Super ammo has 0.355 bullets.

Accuracy depends on the bullet and powder combination (see the article on 38 Super accuracy), specifically what your barrel likes. I've not seen it depend on diameter, and I've shot a few thousand rounds via a Ransom Rest. Diameter hasn't predicted anything I've seen so far.

So, in summary, ignore the .355 v .356 thing. Seriously.
 
Ignore the .355 v .356 thing. Seriously. The 38 Super and 9mm have the same SAAMI 0.355 spec for barrel groove diameter. Actual barrel groove diameters in 9mm and 38 barrels run .355 to 0.357. Most 9mm are 0.356-0.357.

Most factory 38 Super ammo has 0.355 bullets.

Accuracy depends on the bullet and powder combination (see the article on 38 Super accuracy), specifically what your barrel likes. I've not seen it depend on diameter, and I've shot a few thousand rounds via a Ransom Rest. Diameter hasn't predicted anything I've seen so far.

So, in summary, ignore the .355 v .356 thing. Seriously.
Read the article. Great info. Thanks for the link.
 
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