KW sorta abbreviates the way the law reads. Here is the way the reg is written.
Deer, antelope and bear is min .40 cal.
Elk and moose is min .50 cal.
From .40 to .50 cal bullets must weigh a min of 170 grains.
If greater than .50 cal, bullets must weigh a min of 210 grains.
So, you see, the 210 grain weight is to accomadate calibers between .50 and .54.
In any case, if you want to hunt big game in CO with round ball you need a min .50 caliber.
There is plenty of public land in CO with good antelope hunting available. Usually on BLM land and like Mike Brines said, on the National Grasslands. If you want to hunt a buck, then your best chance is to draw for an ml tag. You will need to build some preference points to draw a buck tag for CF rifle season (ml is acceptable).
All rifle and ml antelope tags are by the draw and need to be in by First week of April. You need to brush up on your statistical analysis to figure out your odds for any given unit. :haha: