what is the difference power wise factory type load apples to apples?

Not much to compare. Typical 10MM factory loads use much heavier bullets than 357 Sig at about the same velocity.

__________________
Life Is A Gift. Defend it!

Yup, only the neutered FBI 10mm round would be compared to the Sig round.
One can compare the 10mm to the the 9x25 Dillon though.

Double Tap 10mm 135 grain JHP at 1600 fps from 5" barrel vs 357 Sig 100 grain Cor-bon at 1600 (unknown barrel length). The Sig was designed to equal the performance of the 125 grain 357 Magnum revolver load, which, if IIRC, was 1450 fps from a 4" barrel. The P239 I had in .357 Sig was very accurate and could cut cloverleaf groups at 25 yards when my hand-eye coordination was dialed in. Still have my 10mm Delta, the Sig left home years ago. The 10 is far more versatile than the Sig round.

You know how in the car world you have newer, lighter, smaller engines with power adders making great horsepower, but you always have guys saying "there is no replacement for displacement!"? It's kind of like that, if you catch my drift. But those displacement guys still have to remember, to talk smack you still have to go fast...

For the record I love 10mm, probably one of the most versatile handgun rounds, glad it's on the up swing!

Semper Paratus

__________________
Semper Paratus

I have a glock 32 in 357sig which is really accurate but would like to get a P239 in 357sig have the P239 in 9mm I would get a M&P in 357sig if I could find one in M&Pc but hard to fined

I have both and load for both. In my opinion, they are two different tools for two different jobs. The .357 sig lends itself well to a lot of power in a small concealable package. It is flat shooting and penetrates hard barriers well. It’s a great self defense round. The 10mm is of course much more powerful and a much larger bullet both in cross section and mass. It’s a good hunting round, retaining much more energy than the .357 sig at any distance. It’s THE best gun to be packing into bear country, with it’s high capacity and knock down power. I have a full size steel EAA Witness in 10mm that has the same capacity as a G20 that I can grab if the situation warrants it. Unfortunately, the platforms created for it aren’t very concealable. I know you’ll say,” what about the G29?” Well, I carried one for awhile and hated it. If you can comfortably conceal one, more power to ya. When I want concealability, I’m talking single stack and 7+1 capacity with a 3.5” barrel. If someone were to make a 10mm with those specs, they would sell like hot cakes, IMO. I’ve got some single stack .40 S&W’s that I’ve converted to 10mm, and with some tuning to get them to the point that I trust them unequivocally, I will carry them. In the meantime, I carry my Sig P239 .357 that is accurate and ultra reliable with its bottle-necked cartridge, not to mention it’s carrying and shooting ergonomics. Also, two of the mags only take up as much room as one double stack, so that also adds to concealability.

__________________
USS Brewton FF1086
SWCA#3597

I still want a 9x25 gun. I understand why it's not a popular defensive choice...too much of a good thing.

__________________
Psalm 27:2

My M&P .40 has had a 357sig barrel in it since finding an original factory 357sig is difficult.
357sig rocks!!!

__________________
M&P 357sig,G31 357sig,M&P 9