That was an incredibly lucky shot.
“The average female grizzly bear weighs about 400 pounds and the average male about 700 pounds. The famous salmon fed male brown bears of Alaska’s Kodiak Island might run 1000 pounds and in extreme cases can weigh as much as 1600 pounds.
“By comparison, the average adult male African lion weighs about 330 pounds and an adult Bengal tiger might weigh 450 pounds.
“The minimum recommended calibers for all of the great bears are the .30-06 Springfield with 180 grain (SD .271) to 220 grain (SD .331) bullets and any of the standard length 7mm Magnum cartridges with 175 grain (SD .310) bullets. In addition to the .30-06, other suitable standard cartridges include the .338-06 A-Square and .35 Whelen, both with 225 to 250 grain bullets.
“The most recommended calibers are the standard length and long .300 Magnums with 180 to 220 grain bullets, 8mm Magnums with 200 grain (SD .274) to 220 grain (SD .301) bullets, .338 Magnums with 225 grain (SD .281) to 250 grain (SD .313) bullets, .35 caliber Magnums with 250 grain (SD .279) bullets and .375 Magnums with 270 grain (SD .274) to 300 grain (SD .305) bullets.”
.45-70 is real popular around here.