Re: 338 250gr Sierra SBT
I've shot a couple of bull moose with the .338 Sierra 250 gr SBT at ranges between 120-250 yds. I was using the .338 Win Mag and they worked fine in that cartridge. I recall the lead core slid completely forward and separated from the jacket on one moose, but the cylindrical piece of lead was still very substantial in length and penetrated sufficiently well. I may have even shot more than 2 moose. Don't recall any bears, but it's possible I killed my first Alaskan black bear with this bullet also. I recall no bad experiences with this bullet. The most notable observation was the jacket separating from the lead core on that one recovered bullet. Which is not ideal by any means. It's not the bullet I would select specifically for Alaskan brown or grizzly bear. But I think it would work OK.
I used these for moose hunting from about 25 to 30 years ago here in Alaska. I have no idea if these Sierra bullets are manufactured identically today as they were back then.