I am using a 50L boiler so my cuts start with a 250ml fores cut. Then on to my heads.
150ml fores cut on a t500 will be fine. Chances are your next couple cuts (heads) wont be kept in your drinking stock anyway. Keep them for a feints run later on.
equipment: 2" pot with 2" shotty 400mm long 5x 1/2" on a t500 boiler. 50l keg boiler 4" still mount 4" sight glass 1" drain.. 4 plate 4" bubbler, 600mm packed section