Personally I would not want a barrel that heavy if it's a rifle you plan to carry. You're probably looking at well over 10lbs even without a scope and mounts. My Sendero's and VSSFII are right around 14, 14, and 12lbs if I remember right and my heavy 1999 with the long Med Palma barrel I think is right around 16lbs.
If that barrel is stright (no taper) and basically 1" down it's full length it's probably going to come in somewhere between 12-14lbs but that's just a guess and of course that's figuring on 28" length.
You can look at different barrel manufacturers spec sheets and they'll tell you the approximate weight per inch or finished lengths.
For a rig you plan to carry, particularly in any kind of rough/steep terrain or for long pack in's I'd look at something no heavier than a standard bull magnum contour which finishes at about .75" at the muzzle. The sendero is about .825 and in equal length barrels the weight difference is noticeable.
I got a Criterion from Northland for the 783 at 25" in a Lite Varmint contour. It's a good fit for the Boyds stock you have. I suspect a Bull Barrel will require hogging out the barrel channel to much. The Lite Varmint is pretty meaty and I personally wouldn't want to carry anything heavier for any type of field use. Sorry... I haven't shot it yet. Just a note, the barrel tenon threads on the Remington action are a little rough and you get the impression there could be some binding so use some anti-seize when screwing things together.
Thanks. You guys have given me more to think about. 1 of the rifles I am for sure not planning on carrying. It will just be a range toy and I will most likely stick with the no taper bull contour. Currently I'm planning for this being a 6.5-284.
The other rifle I'm leaning towards building a 300 Win Mag. I have stayed away from belted Magnums. But I've done enough research on reloading for them now, I'm not as concerned about it any longer. There are many nice 30 caliber magnums available. My main reason for picking the 300 Win Mag is do to it's supported the best. Reloading dies, brass, etc... And Nothland Shooters Supply already has the reamer for it.
So let me ask you guys this. Keeping in mind I have other lightweight hunting rifles (308, 30-06, 270, and more), how would you build a 300 Win Mag that will be used for target and hunting? I plan to hopefully use the heavier bullets available in 30 caliber; 220-240 grains. Since this will be target/hunting, I will be using a muzzle brake.
Barrel length - since I'm using a brake I think 26 inches? Maybe 28 inches?
Barrel contour - from your opinions I'm now thinking Light Varmint (0.700 at muzzle) or Varmint (0.815 at muzzle).
Barrel Twist - the standard is 1:10 but would a 1:9 be better for the heavy bullets? I've read opinions on both sides for the barrel twist.
I plan to use a Walnut stock for the 300 Mag. Many think that laminate or synthetic is better for accuracy because of less flex. Will I regret using real wood?
I can hunt everything in my state with the rifles I already own. A hunting trip out west will be unlikely for a few years (at least) because I have a couple little kids running around at home. But if the chance comes, it will be nice to be practiced up with a magnum cartridge that I can use the heavy bullets with better than my 30-06's.
Thanks!