Frank7mm, I am not a fan of Powerbelt bullets as they are pretty fragile...IMO.
Many folks use the 40 caliber XTP, SST, and Barnes Spitfires mainly in Harvester Blue sabots.
Sizing 45 caliber bullets or picking the Parker bullets for a snug fit sabotless work well too.
Nice looking rifle ATH, and very nice shooting
PS I use a 45 ACP with either a LRM primer or a modified ACP case to accept a 209 primer...generally the latter, in a converted 30-06 Savage model 110.