Hi Charlie!
The lightweight .243 in a 20 inch bolt is a smart choice.
I own an AR, 2 700's (221 FB, and 223), owned a 22-250 Howa, 270 Rem (700), shotgun etc, etc.
I also have an old Ruger RL (ultra light)I purchased in 1985 in .243 Win. Gun weighs under 7 pounds with its fixed 4x scope. When I have a week off of work to hunt 'yotes in the fall, this is the gun I pick every time. Easy carrying, fast handling, with plenty of knockdown power for stubborn dogs.
I have been experimenting with the different calibers and gun configurations for over 3 years now, and have found no combo better for New England calling yet.
Maybe the 6.8........ /ubbthreads/images/graemlins/smile.gif
To make it super easy, I use the same 85 grain Sierra BTHP Gameking for deer and coyotes. I have tried the 70 grain Nosler BT over a stiff load of 4064 with devestating results on coyotes. The .243 Win...... King of the Big bang flop coyote calibers.
About the only downside is short barrel life. Mines on the downside of its second barrel. /ubbthreads/images/graemlins/frown.gif But the 20 inch bolt is a hard gun not to shoot alot............and man, it smokes yotes'!
You will like it...........alot. Have fun, Sleddogg /ubbthreads/images/graemlins/wink.gif