Do what you want a 6 mm would be fine for everything you listed as requirements. Most don't look for the .243cal to be a long range big game hunting tool in any configuration. Paper and very very small deer maybe. LOL. Go 6mm with an extended Wyatt Box and never look back.
If we all did what sugar tits preaches Russia would run out of brides to sale. Ps a Leupold would probably work fine as well.
