am going on a trip to the upper west coast.
You didn't say what you're going to be doing at the "upper west coast" - backpacking, climbing, day hiking, fishing, car camping, touring in a motor home, or what? It makes a difference. That said, back in our younger years, the wife and I did one heck of a lot of backpacking, climbing, and day hiking in the Idaho wilderness. I carried a heavily loaded Taurus 41 Magnum because there
are grizzlies here, along with black bears, cougars and wolves.
We also each carried a large canister of strong pepper spray. But our first line of defense was to make a lot of noise while hiking through brushy areas or other areas where we might surprise a bear.
In all the time my wife and I have spent in the backcountry, we have never even seen a single grizzly in the wild outside of Yellowstone Park. And the only black bears we ever saw were running away. We did come across the occasional cougar track, but cougars are generally very reclusive. That's except for the ones that wander into the big city of Pocatello - about 25 miles from here. It seems like that's been happening about once a year lately. The Fish and Game Department had to tranquilize and deport one from the Idaho State University campus last winter.
I guess it's been 20 years ago that they introduced wolves back into Idaho. And the first area they introduced them was up around Challis - one of my wife's and my favorite backpacking areas. They never bothered us, in fact we seldom seen one, and we enjoyed hearing them. They even howl during the day sometimes - a fact that we didn't learn from watching TV and reading Jack London novels.
At any rate, no matter what anyone says on these internet message forums, if you're going to be doing serious backpacking or climbing in the backcountry, you're not going to want to be carrying a danged "shotgun loaded with slugs" or a "large bore rifle" when you have a 65 or 70 pound pack on your back. Rifles and shotguns make lousy hiking staffs, and if you're carrying one in Idaho, you'd better have a valid Idaho hunting license or you're going to get a ticket, and maybe lose your gun on top of that.