Recommendations for 10mm Hard Cast Ammunition

The boss is taking all of us PMs and estimators out to Montana again in a couple weeks. Time will be spent between hiking and and fly fishing. (I plan to tell them to drop me off at some point on the Middle Fork of the Flathead and pick me up on their way back to the chalet in the evenings.)

Bear season is in full swing right now as the grizzlies are fattening up for the winter, and it'll still be going full bore when we get there on Oct 3. I'll be sure to have a can of bear spray on my side at all times, but in the event that the bear spray doesn't produce the desired results I have my Sig P220 Elite 10mm for backup.

In order to have any hope of slowing down a 600 to 800 pound bear I'll have to keep both mags loaded with a 200 grain hard cast round for penetration without a lot of fragmenting and rapid dissipation of energy within the first few inches of hitting the target.

Does anyone here have a recommendation for good, reliable ammunition that fits the bill? I'm not too worried about cost and I probably will only need to purchase a small box of maybe twenty rounds since both mags are single stack eights. I also expect to return from our adventure with all the ammunition that I take out that way since I'm not looking for an opportunity to take on a big, toothy critter like a grizzly, but I also don't want to be completely unprepared should an unpleasant occur.

TIA for your thoughts.

For the record, we did have a close call during our trip in September/October 2023 with a sizeable boar grizzly that looked like he was seriously considering crossing the ford to come visit us up close and personal when we were fishing the North Fork of the Flathead about six miles below Polebridge. I just want to ensure all bases are covered this time.