question on 10mm/40 s&w rounds

[Just1Mor]

So i have a Colt Delta Elite and was wondering if it is possible to fire 40 S&W out of a 10mm gun? Is it like the 357/38 sp deal?

[94Doug]

only in a revolver.

[Just1Mor]

do you know why that would be? Care to fill me in a little more??? Thanks in advance..

[starnbar]

those cases headspace on the rim and since the 40 is shorter that the 10mm it would not headspace correctly.

[starnbar]

the shorter case will go deeper into the chamber preventing the firing pin from contacting the primer

[Just1Mor]

i see, im looking at the specs and it looks like the rim diameter is 10.85 on the 10 and 10.8 on the 38 sp but the thickness is the same. So that little bit difference is what the problem is? I was told that you can cut down 10mm cases for 40 cal. just was not sure. Interesting.

[Crusty Deary Ol'Coot]

You could probably cut down 10mm for 40S&W, providing the internal case taper on the 10mm does not begin too soon and cause seating or external loaded cartridge dia. problems.

But, as said the 10mm and .40S&W both head space on the case mouth and therefore the 40S&W is too short to properly operate in the 10mm chamber.

On the other hand, both the .38 and .357 seat or head space on the case rim and are not dependent on case length for head space as with the auto cartridges.

Some auto cartridges are fired in wheel guns, but with cylinders fitted for such use or with the use of half moon or full moon clips into which the rimless auto cartridge is snapped before it is loaded into the cylinder.

With proper loads, the boolits are interchangable between 10mm and .40S&W, but not the cases.

Keep em coming!

Crusty Deary Ol'Coot

[Just1Mor]

http://www.thegunzone.com/10v40.html

I see what you are talking about, i ran across this article and explains just as you have said.

This young Boolit jedi has much to learn still, but im glad i can get reliable info here. Thanks alot for your help.

With that said, can you load hs-7 in 38 sp. using 158 LSWC

[mike in co]

gentlemen,
as we know i got a 10mm last month.
i have been working on loads for a couple of weeks....only one good load so far...

but back to the question

YES( if the extractor will hold the case for the firing pin hit)

.

i loaded 10 rd of 165 40 s&w in my 10mm mags and fired all 10 rounds without a hiccup....


mike in co

[PepperBuddha]

I have a complete slide with a .40S&W barrel and mags. I switch back and forth between 10mm and .40S&W in my Colt Delta Elite.

[mike in co]

and since i have a 1911, i will try some 45 gap's when i get some....

mike in co

[Firebricker]

Just1Mor, You could load some light target loads at similiar power as .40 but a setup like PepperBudda's would be ideal. Because you can take advantage of inexpansive once fired .40 S&W brass. FB

[Bret4207]

With that said, can you load hs-7 in 38 sp. using 158 LSWC

Go to the Hogdon website and look for info on HS-7 using 158 gr bullets or Boolits.

[StarMetal]

To answer the posters question more the likely the 40 S&W will fire in the 1911 because, as mentioned by mike of co, the extractor will hold the cartridge against the breech face. Is it like the 38/357? No, those headspace on the rim so nothing has to hold it anywhere. Is is safe? Hmmmmmm...you can probably get away with it...but then there is Murphy's Law. If you have the 40's I'd sell them or trade them. If you want 40 performance low your 10's down.

[troy_mclure]

it will fire, but will cause destructive wear and tear on the chamber and throat.

you can easily and cheaply get a .40 barrel and drop it in.

[Just1Mor]

i was thinking about the .40 barrel so that is good to know, and had also thought about the .45 gap so Mike in Co let me know how that goes. i think that would be great....

Thats Bret4207 i have a ton of hs-7 left and cant find any info on it at all, seams like they switched over to another powder. but i really like hs-7 for the 10 and have some great loads that i have worked up so i think ill save that for the 10.

[Just1Mor]

gentlemen,
as we know i got a 10mm last month.
i have been working on lods for a couple of weeks....only one good load so far...

but back to the question

YES( if the extractor will hold the case for the firing pin hit)

.

i loaded 10 rd of 165 40 s&w in my 10mm mags and fired all 10 rounds without a hiccup....


mike in co

I have found some pretty powerful loads and some great pop loads for the 10mm. most recent is 155gr RN with 5 gr red dot. i do have a light recoil spring so the rounds with fully cycle the slide but very fun and cheap.

full power HS-7 is a great performer, but would try and stay away from blue dot unless you have a heavy recoil spring. To many stories of the slides getting wrecked, but that on the old delta's.

[azcruiser]

get a 40 barrel and if your want some fun get a 357 SIG barrel for it at the same time . They should just drop in .MY Glock shoots all 3 mags work too

[Adam10mm]

I've shot many thousands of rounds in an aluminum frame 1911 full power 10mm using Blue Dot. Never ever had any issue of any kind.

[Adam10mm]

W571 is the same as HS7. Longshot is a reformulated HS7, data will NOT interchange with LS due to density.