Bbear - sure you will be happy. 35 is a potent caliber.
Re: 338-06 vs 6BR - on deer both are deadly.
As to my suggestion to use a smaller bore - to 300 yds they are very lethal and if a longer shot presents and you don't want to pass it up, a smaller faster round is easier to place your shot.
Balance is important. 20" may be too muzzle light if one uses a standard sporter contour. I would personally use a #3 Bartlein contour. In 35 it will be lighter than say a 7mm.
Enjoy your 35. I really liked my 350 n 158 pistol bullets for plinking n were fun to 250 yds. Dropped like bricks past that. Vaporizes milk jugs at 200yd.
