Remington's factory 45 Colt LRN standard velocity ammo makes a nominal 750 fps, and I think that's the most anemic commercially available round on the market. It should perforate deer just fine.
However, that doesn't mean it's the best choice of hunting ammo, IMHO.
I wouldn't drop much below 750 fps for hunting, based on some ballistic tests I did with 45 ACP 230 and 250 gr bullets about 14 years ago. Penetration really starts to drop off once you get below 700.
