RR,
Looking good!
Haven't had a chance to get my new-to-me 300 Whisper out to play yet...just picked it up from USPS last Tuesday. I'm planning on trying the 240 gr SMKs out of it (1 in 8" twist, 10" barrel) Since then work, chasing hogs, getting bow stands ready, and shooting a dove bird or two has occupied my time. Been a busy couple of days!
Hope I get the same accuracy results that you've achieved!