Consensus of pellet/slug choice for RTI P-2?

[Mr.H]

I'm test driving a new P-2, and so far I'm getting good groups with JSB 18.13 (nickel size groups @50 yds, 970 fps). I also have a small tin of the shallow skirt 20.83 RDMs, those were ok, not great compared to the 18.13.

Any of you RTI guys have recommendations? Has there been any improvement with the current JSB RDM 25.39 shallow or deep skirts?