What type of performance are you looking for with this rifle? I have all the RUM's and a RUM wildcat. I can't even imagine anything coming out of the case smaller than a 7mm. My 14 year old shot a whitetail buck, and 2 goats this year with his 7 rum. 190 matrix on top of 102.5 grains of 33. It shoots a easy mid 3200 fps. We had to slow it down for fear the jackets would shred off. If you did decide to do this, your limit will be bullets. Jacked bullets will end up being too slow ( shedding the jackets) or you will have to shoot a solid bullet. I'm just not sure if I could be done...but if it can, I'd LOVE to see it!!
Jayson