Ben,
A big boomer get together would be great! Order up some warmer weather........maybe after ski season.
I will be interested to try the .577/.500 #2, I already have a decent supply of 350 grain and 440 grain 1-30 lead paper patch .50's to duplicate original BP with Swiss 1 1/2 and NfB loads with H4198

The Buckstix load noted on that target is right in the ballpark.
- Mike