don't interchange, the inner case wall is different between the two and the primers are different sizes.
There's plenty of 10mm info out there, check out the freebies from Hodgon and others or grab one of the caliber specific books off of Midway or LGS wherever.
NO!!
Absolutely NOT. They are two completely different cartridges and load data is NOT interchangeable. The only thing they share is the bullet size and diameter. Using data for the 10MM in the 40 would be akin to using 300Win Mag data in a 308 because the share the same bullet and bullet diameter.
The 40 S&W has a case capacity of 19gr H20, the 10MM has a case capacity of 24gr H20. This is important and here is an example why.
QL Calculations.
40 S&W, 180gr Sierra JHP, Ramshot Silhouette, 6.2gr Max
Code:
+00.0 86 6.20 1032 426 33189psi 4289 97.6 0.464 ! Near Maximum !
10MM, 180gr Sierra JHP, Ramshot Silhouette, 8.4gr Max
Code:
+00.0 77 8.40 1216 591 35545psi 4635 100.0 0.501 ! Near Maximum !
This is what would happen if you loaded 10mm data(8.4gr) in the 40.
I don't think that is a very wise thing to do. The 10mm has a longer case and some of the starting loads for 10mm are above the max load .40 S&W. The sig 357 and the 9mm both use the same bullet, but the pressure limits for the two are very different. SAAMI does not publish 10mm pressures (that I can find), but they may also be vastly different.
You would be better off to find the load data for the .40 S&W load you want.
I dont think the OP was asking to reload 10 MM data for his 40. It's the other way around. But still, dont do any loading other than whats listed in the manuals.
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