Microgroove Barrel: Gas Checks and 1,500-1,600 fps max.
Ballard Rifling: Gas Checks up to same velocity as jacketed & plain base bullets 1,700 fps.
Alloy bullets need to be .001"-.002" over barrel groove diameter for best results.
It is more about the pressure, bullet fit, and alloy hardness than the velocity.
Straight and taper cartridges, plain base bullets work well. For bottle neck cartridges, gas checks work best. Again, pressure plays a large role in deposits.
Attached is a link that includes cast reference materials you may find useful.
One more item, if you have not checked out GT Bullets, you should. The alloy they use is perfect for hunting and with a GC will handle high velocity loads in the 45-70.