yes the SMK is a BTHP as well as the berger and JLK and every other custom LR bullet (that is worth a darn)
The LR hunters have been using the SMK for a long time--Hopefully Darryl cassel chimes in here. Also barrelmaker Dan Lilja has good info on his site www.riflebarrels.com
conventional hunting bullets would not work reliably at the extended ranges that they are used on here because the velocity is out of their effective range. The SMK's though seem to work all the time at these extended ranges.
The bitch of most people is that these bullets are for paper only because sierra says so--even though evidence has proven otherwise among many LR hunters. the doubters sware the bullets wont work reliably on game(not necessarily too fast or slow expansion) having never used them for themselves.
the hornady a-max is the other good match hunting bullet.
Im sure if you email DC he can give you the lowdown or just search huntamerica.com and accuratereloading for match king or long range etc..