A great point mentioned above was the full penetration on bears, that provides a good blood trail.
While bears are known for little blood trails, they can be difficult to drop DRT. Smaller bears are not that difficult to kill with cartridges useful for deer, but the bigger bears to require more.
A big boar (black or grizzly) has larger, heavier bone and heavier muscle. Their skin is not overly thick, but can be very loose as on a spring bear. This means that the loose skin will move and cover wounds, and the thick fur will soak up more blood leaving less blood trail. Conversely, fall bears have thick layers of fat that also plug off wounds and provide little blood trail. These factors call for the "enough gun" rule. Larger calibers with heavier bullets will ensure full penetration and two exterior wounds to leave better blood trails.
While I like all of a bullets energy to be expended inside the animal, big bears is where I prefer exit wounds of sufficient size to provide better blood trails. I also aim to hit and break big bone on big bears (offside shoulder and am willing to wait for that shot) so as to limit how far they go after the first hit, as they tend to run more often than they DRT. Unwary bears are a different matter to a bear that is aware of your presence or even agitated. As their demeanour changes, the challenge of a quick, clean harvest can get more difficult, as their presentation to you will change (frontal or quartering to) and/or they will be moving to/away from you, often very quickly, which makes good bullet placement even more difficult.
And I too prefer the double lung shot to the heart shot. A heart shot animal tends run as the shock to the heart really kicks in their adrenaline, whereas taking away their ability to breathe limits how much and how far they will move after the shot (direct experience on multiple big game species over the years). This leads to quicker expiration and shorter blood trails.
For the bigger bears, I believe that the minimum is the 30-06 with 180 gr and heavier bullets of good design such as the Partition, AccuBond, E-Tip, A-Frame, Triple Shocks, etc. The bigger 30's get better and the 338's are even better. The 338 SGK gets a thicker jacket than in other caliber so penetration of this cup and core bullet is better than in others. The 35's from the 356/358 on up are great, the 9.3's and the 375's add even more.
But if I was to end up in a tricky situation with a bear while having another rifle in my hands (such as on a deer, sheep or goat hunt), bullet placement on major bone is going to be my first priority. Follow up shots into the vitals will quickly follow. This is a skill that must be practiced (see Handguns/Grizzlies thread).
While bears are known for little blood trails, they can be difficult to drop DRT. Smaller bears are not that difficult to kill with cartridges useful for deer, but the bigger bears to require more.
A big boar (black or grizzly) has larger, heavier bone and heavier muscle. Their skin is not overly thick, but can be very loose as on a spring bear. This means that the loose skin will move and cover wounds, and the thick fur will soak up more blood leaving less blood trail. Conversely, fall bears have thick layers of fat that also plug off wounds and provide little blood trail. These factors call for the "enough gun" rule. Larger calibers with heavier bullets will ensure full penetration and two exterior wounds to leave better blood trails.
While I like all of a bullets energy to be expended inside the animal, big bears is where I prefer exit wounds of sufficient size to provide better blood trails. I also aim to hit and break big bone on big bears (offside shoulder and am willing to wait for that shot) so as to limit how far they go after the first hit, as they tend to run more often than they DRT. Unwary bears are a different matter to a bear that is aware of your presence or even agitated. As their demeanour changes, the challenge of a quick, clean harvest can get more difficult, as their presentation to you will change (frontal or quartering to) and/or they will be moving to/away from you, often very quickly, which makes good bullet placement even more difficult.
And I too prefer the double lung shot to the heart shot. A heart shot animal tends run as the shock to the heart really kicks in their adrenaline, whereas taking away their ability to breathe limits how much and how far they will move after the shot (direct experience on multiple big game species over the years). This leads to quicker expiration and shorter blood trails.
For the bigger bears, I believe that the minimum is the 30-06 with 180 gr and heavier bullets of good design such as the Partition, AccuBond, E-Tip, A-Frame, Triple Shocks, etc. The bigger 30's get better and the 338's are even better. The 338 SGK gets a thicker jacket than in other caliber so penetration of this cup and core bullet is better than in others. The 35's from the 356/358 on up are great, the 9.3's and the 375's add even more.
But if I was to end up in a tricky situation with a bear while having another rifle in my hands (such as on a deer, sheep or goat hunt), bullet placement on major bone is going to be my first priority. Follow up shots into the vitals will quickly follow. This is a skill that must be practiced (see Handguns/Grizzlies thread).