Regardless of make avoid "top end velocities" in the 40 S&W IF
your gun does not totally support the cartridge. That means barrel around the whole cartridge. With the barrel removed from the gun if you can see case wall with a round in the chamber it is not completely supported.
A few years back I loaded some 40 S&W for my Beretta 96 using Hodgdon Clays powder and a load straight out of the Hodgdon #26 reloading manual for 180 gr HP's. I worked up a load to maximum (4.4 gr DO NOT USE
) with no previous high pressure indications. Fired three rounds with no excessive recoil before I got the 'ka-boom'. The case head separated and ejected the head along with the ejector, ejector spring and pin. Had to send the gun off to the factory for repair.
The next edition of the Hodgdon #27 reloading manual contained a warning you need to consider.
|"**40 S&W Warning: This data is intended for use in firearms which fully support the cartridge in the chamber. Use of this data in firearms which do not fully support the cartridge may result in bulged cases, ruptured cases, case head separation, or other conditions which may result in damage to the firearm and/or result in injury or death of the shooter and bystanders."|
The max load in Manual 26 was 4.4 grains of Hodgdon Clays powder and in Manual 27 it was down to 3.5 grains. Check your gun and the most current load data before you load for the 40 S&W. Be very careful regardless of the powder you choose.