My "big" rifle should be similar to yours. A bit smaller sounds like. I have a 27" barrell + brake. Leupold 6.5-20 with parralax on the objective (losing the side focus knob helps). Cabelas has a big scabbard made by Trail Max. They make a couple models. This one is the biggest. It's made of a pretty ridgid neoprene. My rifle fits snug with a 9-13 bipod on front. The limiting factors seem to be the bipod and the scope. I think the scabbard has room for a longer barrel. However, if you're running a Nightforce your rifle may not fit.
I have another rifle coming I believe I'll have to build a scabbard for. I saw a very simple one a while back. It was pretty much an oversived leather soft case with about a 3/4 zipper. The zipper made the rifle, with big knobs and bipod drop right out. I also think it'd be a cinch to add straps and quick clips to a drag bag.
For balance I add weight to both my cantle bags and saddle bags on the off side. The weight is bullets, spotting scope, tripod, revolver, and water. It takes a bit of consideration, but isn't difficult. You might also make your bags quick detatch so you can chuck 'em in your backpack quickly. This also allows you to weight your saddle bags unevenly without them riding that way.
Last edited by grit; 08-06-2008 at 12:11 AM.