Poor Quebec Caribou Hunt.

Well, the thing about Quebec-Labrador Caribou is that they migrate in small groups over a large area and the migration pattern changes each year. Taking a big bull during the migration can be difficult because you need to be lucky enough to be where they will be migrating when they are there. Some of the outfitters will relocate you after a certain number of days if you don't see a single animal. Still, others will fly the areas and land where they are at but many feel this isn't exactly hunting and those types of hunts can be pricy. Another option would be to pay high bucks and hunt them in their permanent winter range along Hudson Bay and that can be like fishing in a barrel. You hunted them on their own terms. That's a good feeling. I hunted with Club Chambeaux in Aug. of 2000 and hunted from two different camps before I ever saw one single animal. The hunt I was on was a self-guided hunt and I got really lucky. It takes luck to kill a trophy Quebec-Labrador Caribou if you don't find one from the air and land next to it. You did good. That's hunting. I'm sorry to hear you didn't get that trophy of a lifetimne, but you hunted them fair chase and didn't come home empty handed. Several of the other Caribou species are easier to hunt for a good trophy. You picked a tough one to start with.
Here's a picture of the only bull I shot in 2000.
I took this one close to Riviere De Paz, which is a tributary of the George River, so he's from the George River herd.

They should have been flat shooting and the load should have been capable of bringing them down. Sounds like a good combo.
I am curious, I love Hornady and Nosler bullets. they are my two favorite. However, I have not had such good luck with the Hornady Inter-bond bullets shooting accurately? So I still am clinging to the Hornady Inter-lock bullets for most big game I go after and use the Noslers for elk and would use Nosler on Moose if I get drawn.
You evidently have come across a good shooting load with the inter-bonds?

I hunted caribou out of the George River Lodge a few years back. We hit the migration dead nuts and saw probably a 1000 caribou. 6 hunters in camp, all taged out on decent bulls. Some of us shot too soon .. ... ans settled for smaller bulls than we had to, but the fishing and Ptarmagin hunting was good the rest of the week... ;D

Out of our six hunters we had two '06's, a 257 Weatherby, a 9.3x74, my 270 and one longbow. Our guide chuckled a little at the guy with the 9.3x74. He said he wondered if the guy was afraid of Polar Bears.. ;D

I used a Sierra 140 grain BTSP in my 270. I know, what was I thinking? But bull number one was at about 75 yards and I took him right behind the shoulder angling forward to the far side shouder. The bullet didn't exit.. ..but the caribou went down as quick as any animal I ever shot. The second bull was at 335 yards. He was in some scrubby pines and I could only see his neck and head. Took him lower dead center in the neck, he staggered around a little bit so I put another one in him, darn near the same spot, and he crumbled.

I saw 2 of the '06 bulls drop in their tracks and one of the 257 Weatherby bulls also. The "06 bulls fell to a Hornady Interlock, not sure what grain, and the 257 Weatherby guy was using factory loads with Hornady bullets, I think 117 grains??? From what I saw their is no need for anything big and heavy for caribou. Your shots might be a little long, but a 25-06, 270, 280 or the likes will handle the biggest 'bou you'll ever see...