All the law enforement agencies we work with use either 168GR Federal Gold medal or Black hills, OR 175GR Federal GM or Black hills.
all the above use the Sierra Match king bullets.

A number of LE agencies do however use the 165GR Trohpy bonded Bear claw bullet for shooting through glass.

The Aluminum block is not considered bedded. It is a bedding block only.
Almost all civillian competetive shooters that use the HS blocked stocks, will have then bedded as well.

Some parts of the Military use the 300 WinMag as the Sniper chambering.
These government loads use either Winchester or Federal as the ammo makers. Both loads shoot a 190GR Sierra match king and are very accurate.

Celt