Hornady 55gr #2266 SPw/c 22.7 grs Win. 748 Win Brass WSR primed COL
2.20" is the starting load in Hornady V Manual. I used it in my Kmini Ranch 191 series, it cycles fine and is reliable.
If using a Mini for home defense make sure to use a bullet with cannelure and a firm crimp, and check the Col to make sure it will fit your magazine and function through the action. The Minis rather violent op rod cycle, will loosen any bullet not firmly crimped.
Not to rain on your parade, I to am a brother in the Ruger fan club ,but I gave up hand loading for my Mini many years ago (that wasn't a stutter). Its rather challenged in the accuracy department especially after the barrel warms up, so I just buy and shoot surplus or medium priced, factory fodder. I gave up on trying to find a pet load, because it just doesn't pan out. I have some of that loading I gave at the top of the page, but loaded with a higher charge, that I use for home defense, and one or two shot varmint control. But after that the barrel heats up and the accuracy starts to wander.
You will be hard pressed to find a rifle as reliable as the Mini, it will digest and cycle pickles if you could fit them in the mag. If you want to go hicap try to buy the factorys or a Masen or one of the other high quality mags.
I would not want to be any where near 500 meters of the working end of any Mini. It is a fine weapon when used within the design limits and a whole lot of fun to shoot. If you want to reload for it make sure to get a brass catcher! You'll find out why ! Have fun.