Hello, before I got "out of the forty business," the Winchester 155 gr Silvertip was my load of choice for protection in my Browning .40 HP and CZ-75B. It grouped well in both guns, exceptionally so in the HP.
From the HP, this round chronographed an average velocity of 1164 ft/sec and from the CZ, 1197 ft/sec. It had a small extreme spread out of both guns.
The round offered power and accuracy as well as feed reliability out of both weapons.
The silver coating is merely an e-nickle over standard gilding metal.
Informal expansion tests showed very good expansion that occurred consistently. Media included water, wetpack, and a couple of jackrabbits.
I think this round would be a fine defensive load.
Best.