Well according to SPS’s website their modified guns measure approx. 207x140x41mm, and that is pretty close to our minimum length of 210mm, so maybe with a bit of creative measuring you can find those 3 mm. If not, then I’m sure a gunsmith can ad 3 mm to the length (and still have it fit the box). But none the less you are stuck in Minor, as 357 Sig is not approved for Major in Modified, and we can't have 40 S&W .
DVC
Bo Stampe Madsen