Yes that is correct. Size the body with the 40 carbide, then set the shoulder with the SIG die. It keeps you from having to lube then clean the brass after sizing.
"Do I reload to shoot more, or do I shoot to reload more?" 30-378 Weatherby, .300 RUM, 7mm Rem Mag, 6.5 Creedmoor, .223/5.56, .375 H&H, .40 S&W, 10mm, .357 SIG
Any time. Good luck, and enjoy! The SIG is fun to shoot. Keep in mind, you may want to go with a slightly heavier recoil spring if you use full power loads. The XDm comes with an 18# spring from the factory which works well with factory loads and light plinking loads. But with full power .40 and .357 SIG loads, I ended up going up to a 20# and it smoothed it out a good bit. I have a 22# I will be trying soon to see if it makes it smoother or if it is too much.
"Do I reload to shoot more, or do I shoot to reload more?" 30-378 Weatherby, .300 RUM, 7mm Rem Mag, 6.5 Creedmoor, .223/5.56, .375 H&H, .40 S&W, 10mm, .357 SIG
Recoil springs are cheap, usually around $7-$8 a piece. If it is a Glock, most dealers carry springs for them, at least in my area. I'm not familiar with the Glock, but it should do just fine. If it was a .40 and the factory spring is still in great shape, you should be good to go. My factory spring was fine, but the heavier one smoothed out the snappiness of the full power loads that are running 1,480 fps - 1,500 fps.
"Do I reload to shoot more, or do I shoot to reload more?" 30-378 Weatherby, .300 RUM, 7mm Rem Mag, 6.5 Creedmoor, .223/5.56, .375 H&H, .40 S&W, 10mm, .357 SIG