Ok heres my 2c haha
I havent had any experience with 6.5x55 but as a general rule
The faster you push a projectile the more explody it gets. This can be bad if the projectile doesnt penetrate far enough into the vitals
Barnes are solid copper projectiles as are hornady GMX and a few others, these need to be pushed fast for reliable/any expansion. Note the GMX has a plastic tip. These bullets open up a bit and look like a nice mushroom but nearly always exit the animal
The next step is a bonded core bullet like the nosler accubond (these also have a plastic tip) but are designed to be pushed fast and will create a nice mushroom and still retain like 90% of there weight, i have only ever recovered one accubond and that was out of my wsm, they are devastating killers up close and a reliable projectile
Then you get the likes of the hornady SST and nosler BT (both have plastic tip) they are quite soft in comparision to the barnes and accubonds and will explode a bit and create pretty massive damage internally, they can however explode up close and the animal will end up with a gruesome surface wound (hasnt happened to me but does supposedly happen)
Then you get the hornday AMAX like toby says which is also very soft and will expand down to pretty low velocities which is why its a common projectile for long range.
Powershok or federal blue box seems to get pretty good reps and if you have confidence in it use it
Some people like explody projectiles that act like a grenade inside the animal (e.g sst bt amax) others like bonded projectiles that will stay together and create an even wound channel through the animal and exit the other side usually creating a better blood trail (e.g barnes, GMX and accubonds)
Personal preference
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