Is there a general rule-of-thumb for velocity to keep below so the PT front half doesn't shred? I tend to like my bullets to stay together incase I have to hit game where the meat is.
The front portion of Partitions don't "shred". The front portion has a relatively thin jacket and opens readily. It is not unusual to find most of the lead in the front half gone with the front jacket peeled all the way back to the partition. When hitting elk bone it's not unusual to find all the front lead gone and a few wisps of the front jacket remaining.
They're supposed to work that way............