Reloading 357 sig bullet in 9mm?

[drewzer17]

So tell me if I’m missing anything… both the Sig and the 9 mm shoot a .355 inch bullet. I’ve read the sig is shorter. What’s the problems/ limitations of running a 125 gr .355 bullet made for a .357 sig and loading it in a 9mm?

 

[Zero333]

Tres Cinco Cinco

AKA .355"

I'm just a Polak. What do I know.

 

[Ringostar]

Curious question, if you have same diameter and weight, how do you get a shorter length other than a slight variation in nose shape?

 

[Ringostar]

I haven’t loaded 357 Sig for over 10 years, but I thought they called for a .356 diameter. I only loaded light plinking rounds and used .356 cast lead.

 

[Adam in WI]

Are they heavier jacketed for the higher velocities?

 

[Lkwebb]

Imo the reason that is shorter is cause of the bottle neck case and the fact you seat the bullet a lil deeper. The shorter over all length put the bullet closer to the powder to reduced bullet set back

 

[Zero333]

Up here in Canada we have CamPro, Plated bullets in .355" that weight up to 158 gr. besides the usual 115, 124 and 147 gr.

If we have something in such a small country I'm sure you fellas down below who have tons more components available can also find something heavier than 147 gr.

9mm Lead bullets should always be .356"

Edit: I remember someone telling me several years ago about using larger than .355" bullets in his 357 Sig.
I might not be remembering correctly but I think he was talking .357" plated bullets with good results.

So there is NO reason why you couldn't use .357" bullets,... 0.002" should not raise the pressures very much. I'd be surprised if the pressures raised more than 500 psi if your bore grove to grove is .355" and you used .357" bullet

 

[Zero333]

You can always slug the barrel... Use a big fishing lead weight and hammer it into the muzzle. Then use a micrometer to get the most correct reading. Depending on how many groves are in the barrel you might have to take many measurements to get it right. Even number of groves is easy to mic. Odd number of groves is more tricky.

 

[Zero333]

Forgot to mention... .357 Sig is just a name and not bullet diameter.

7.62x39 mm is also just a name because actual bores are really anything from 7.88 mm to 7.92 mm grove to grove....

A true 7.62 mm bore is actually 7.82 mm grove to grove and 7.62 land to land.

What we call a 6mm bullet actually measures 6.17 mm which = 0.243" grove to grove.

6 mm is actually .236" which is what a 243win measures land to land.

.236" Navy is a 6 mm land to land AKA 6 mm Lee that is .243" grove to grove.

5.45x39 mm ruski is .221" grove to grove.

221 Rem Fireball is .224" grove to grove and .218" land to land.

.218" bee is truly .218" land to land and of course .224" grove to grove.

240 Weatherby mag is neither .240" land to land nor grove to grove. It's actually .218" land to land and .224" grove to grove.

and so on and so on and so on and so on I could write a book LOL.

 

[Sniper338]

Same bullet... done it plenty.

 

[drewzer17]

Sorry for the crappy photo. I’m in bed experiencing insomnia yet again but here is a 9 mm mic’ed out it is .355 .. being that the “sig 357” bullet 125 is .355. I see no reason why I can’t safely load it and shoot it. It’s incredibly hard to find gold dots in 124 grain and it just dawned on me. I can take this 125 grain it’s the same diameter and load it.

If it is indeed shorter, I’ll just have to get it down far enough into the case to get a good crimp on it.. I suppose with equal powdered charge seating deeper will increase pressure

 

[Timberyote]

I've loaded the 357SIG bullet in 9mm because my favs weren't available.

It's a 9mm (0.355") bullet and I think it's more than likely the profile.

It feeds from the Glock, SIG 225 and 1911 9mm great.

 

[Zero333]

Sorry for the crappy photo. I’m in bed experiencing insomnia yet again but here is a 9 mm mic’ed out it is .355View attachment 1491925 .. being that the “sig 357” bullet 125 is .355. I see no reason why I can’t safely load it and shoot it. It’s incredibly hard to find gold dots in 124 grain and it just dawned on me. I can take this 125 grain it’s the same diameter and load it.

If it is indeed shorter, I’ll just have to get it down far enough into the case to get a good crimp on it.. I suppose with equal powdered charge seating deeper will increase pressure

It's very hard to find most of the Gold Dot bullets anywhere.

The box you have does say "357 Sig" but underneath says .355"... That kind of says it all.

BTW... You're using a Caliper and not a micrometer

 

[El Matador]

Yes, the 357 Sig uses 9mm bullets that measure .355". The muzzle velocity of the Sig is higher than your average 9mm (+200 fps) so presumably the 357 Sig bullets will be designed with that in mind. A smaller hollow point and/or harder lead alloy would mean they may not expand optimally at lower velocity. I would go ahead and use them with confidence, especially if it's just for practice. And if it's for self defense, wait for a good broadside shot :-D

 

[Old Navy]

So tell me if I’m missing anything… both the Sig and the 9 mm shoot a .355 inch bullet. I’ve read the sig is shorter. What’s the problems/ limitations of running a 125 gr .355 bullet made for a .357 sig and loading it in a 9mm?

None!