Wrenches,
1300 +/- is mid-velocity.
1600 is the old traditional full power 1-oz load.
1135 is very low recoil and is only good for very limited applications. Leather jackets have been known to defeat it in a 00-buck loading.
High brass was developed decades ago to be quickly identifiable to hunters that they held heavier shot payloads an/or higher velocities and usually #6, #5, #4 or larger upland hunting loads.
High brass is no stronger than low brass as far as withstanding chamber pressures and such.