Re: What is the max rang a .223 is good at for Varmint hunting
The longest kill I've had with a 223, was 602 yards on a small cotton tail rabbit. I used a 50grn V-max at around 3400fps out of a 25" barrel. I put 16 MOA of elevation into the scope. I mostly used my 223 for 100 to 300 yard shots, that seem to be were the 223 really did it's best work. However, if you use a high BC bullet like one of the Sierra Match King's, you will have better results accuracy wise at longer ranges, but the killing power will not be as effective with these types of bullets.
The 223 is a great cartridge. However, if you want to shoot past 300 yards, I would look at the 22-250. If your going to hand load, I would choose the 220 Swift over both the 223 and 22-250. The 220 Swift will out perform the 223 and 22-250 all day long. Sorry, 223 and 22-250 guys, but it's true.
Good luck, and let us know what you decide on.