Re: 300 Ultra Mag....
R1les,
If you are talking about shooting NRA Sanctioned 1000 yd matches, two things. One, you are limited to 30 caliber. Two, you cannot use a muzzle break. You take that 300 RUM out to the range and fire five sighters and twenty shots for record three times...75 rounds or so..hmmm my bet is you will be flinching before your done, your cheek will look like a chipmunk with a jaw full of nuts(for a day or two), and your shoulder will not feel the way it did before the match! Not trying to bust your balls, that's just one hell of a round. What TLF said, you don't need that to play the game. Your 223 with a 1/9 twist is not quite adequate to get you to 1000 properly. I'd get a new quality barrel with a 1/6.5 or 1/7 twist and shoot the 80 SMK's. 24.3 grains of Reloader 15 ought to work just fine! That charge will only get you 1/4 of the case full on that 300RUM. So..for every 8 lb. jug of powder you buy to shoot the 223 you will be buying 4 to shoot the 300. That's 120.00 vs. 480.00!!
Another choice and my recommendation is to move the 223 and the 300RUM and purchase a nice 260 Remington. Awesome accuracy, good throat life, low recoil, and reasonable to load. Did I mention awesome accuracy?
I'm sure that Huskemama scope is a good one, but I'd probably find one of these guys upgrading and buy a nice Leupold 6-24 LR scope and Badger 20 moa single piece base to top it.
Good Luck and welcome to the hide.