I use the Harvester crush rib (green) in the 50/44 and the 300 gr .429 XTP and the crush rib (blue) .45/40 for the 200 gr .400 XTP.
I also use the Harvester black CR 50/45 for the 300 gr T/C shock waves and 451 XTPs. I throw the shock wave supplied sabot away. They are too inconsistant with the amount of pressure to load them and greatly affects accuracy.