Has anybody "slugged" their .30 cal Karma Red Panda?

I've got a couple bare KARMA .30 barrels as Testers last year, there .300" FWIW ?
Scott, Do you have a preference for a ELR slug for 200 yards with the RP? Brand and weight? Tune if available. BTW, I hope to shoot at the Sac club range one of these days as I just renewed my membership for 2025.