I'm afraid I don't know anything about the Dillon 9x25 so I can't give you a comparison. The Winchester 9x23 fires a 125 gr. bullet at a nominal 1450 fps. My personal experience with Winchester factory ammo is that I get 1450+ fps with both the 125 gr. Silvertip and 124 gr. Soft Point from the 4.25" barrel of my Commander. It uses a .900" long case (same length as the .38 Super) and has an operating pressure of 40,000 CUP.
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