I think it likes the 100gr Goex ...I like that group.
Great exercise HA, it sure shows how much of a difference the small amount of powder added or subtracted can make.
I too find the diamond shape works better for open sights, you can bring up the front sight just into the pocket of the peak. Even a 6" round 'bull' is lost behind my front bead at 100 yds.
Good shooting. Love to see someone out this time of the year !!