Squrl- It looks like Speer TNT or a Hornady 120 gr. V max are the lightest commonly available. Norma used to make IIRC a 78gr soft point but that was a while back and was factory loaded in the 7x57 (had some), otherwise you might look a a cast hollow points. I have used the older Nosler 125 gr.BT in my fast twist hot loaded (probably about 1700 or soContender pistol in 30 M1 Carbine (30 Whisper) and they opened up fairly well out to 150 or so but acted much like a game bullet and not an explosive varmint one. I would probably start w/the V-Max as they might be better at expanding on edge shots and break up better on misses than the HP but I never shot either one of that particular wt/dia. or near your velocity level. Maybe one of the newer "green" non lead bullets would work at that speed but I have no experience with them-Muddy