You have to be kidding here right? The .35 Whelen is one one of the hardest hitting rounds around. My buddy shoots one and I have witnessed him flatten caribou at 300 yds like they were hit with a lightning bolt. I have also seen moose flip into the twigs when shot by one. I shoot a .350 rem mag which is basically the same and have never had to shoot twice at any deer , bear or moose I have killed with it. It shoots as flat as most other rounds out to 300 yds and kills way better inside that range. I would have no qualms at all in shooting a grizzly with my .350. I have dropped black bears in thier tracks that were not that much smaller.
I wonder how you can have experience with that rifle/cartridge combo since its quite new?
This reply shows me that you have never killed any game with a .35 cal rifle and I wonder if you have ever owned one at all since its not called "Magnum"? As for factory ammo, remington chambers this round again and has for a while which will guarantee factory ammo will be around.
If you don't have "real" experience with this round then don't give advice. Especially when you base your information on magazine articles.[:@]