I never used a barrel we always just manipulated naturals. We used almost everything for bait, if you feed them very long they end up tasting like what they been eating...so use the better grade dog food LOL. Seriously we had free fish one year, could barely pull hides without gagging. My partners salmon eating grizzly still oozes fish oil from a skull boiled and bleached 5 years ago. The oils can be helpful in keeping them at the site. Poured out like a mineral lick and they'll dig it out like one. Pour it over sticks and they'll eat the sticks. Mix it up. Depending on your regs, an old horse that leads will keep them busy for a while. Just wire it up so they can't move it. A good crop of maggots keeps regenerating also.
Location is much more important than bait type, a big bear is tough to pull from naturals so stay closer to the feed. Spring they're traveling, rutting, and may disappear for the length of the season. Big bear don't like direct light. Start with a good map, pick up your creeks, these are travel routes, I prefer the darker side of the mountain, and overcast a bit helps as well. Find the thickest timber you can, and now you've got food, water, shelter from the sun, and cover. If you can find a finger into an open spot (open meaning exposed to light short brush won't hurt) they are much less likely to come in behind you and cut your trail.
Position logs, and stumps behind the bait so they have to come around front to feed. With a little experience-observation you can position them for an ideal bow shot. Look at your kitchen table and your approach, if there is a wall side you don't use it much, if there's a chair that fits better you use it. Can you see the TV stuff like that.
If you tree stand-camo tarp etc. behind you so you don't skyline, if your rifle hunting don't cut a shooting lane wider than you need, try to combine it with your access to the bait. I always groom these so I can come in and out in the dark without making noise.
Take a yard rake etc, I've known to rake a quarter mile path. Just wide enough to walk is all you need.
Stay on stand until full dark. The last few minutes is always best (it's why we have no pictures of our best bears). Coyote in and out. If you need to add bait, late morning or midday.
Mind your topknot Pilgrim, Yellowstone isn't that far, and some old Grizzly tired of laying awake listening to wolf howls may go walkabout. But that's a whole 'nother chapter. I'll send you some pictures if one of the kid's stops by for some technical help, Good Luck