know the Mini doesn't shoot very well
Load for it (or feed it good quality ammo, in any case) as you would for a bolt action and you might be surprised. I suspect that "doesn't shoot" story was started by guys who used the cheapest possible crap ammo to 'play soldier' and listen to the sound of their own rapid fire as they hastened to lengthen the throats in their barrels.
I've had very good luck with 55 gr. bullets and IMR-4064 - around 26 grains - and increasing by tenths. 26 grains isn't much powder, and increasing by even half grain increments can cause you to bypass an accuracy node without even knowing it was there. In the past I've also used WW748 with good results - if memory serves me, 748 is about the same as H335 - but it would take some digging to find my old recipes.
My pet load is WW brass, 55 gr. Nosler Solid Base jsp (cannelured and modestly crimped as mentioned above) with CCI-400 primers and 26.1 gr. of IMR-4064. One of my stainless (non-ranch) Minis gives me an average 1 MOA with that load; my worst worn out beater of a wood/blued mini does about 2.5 MOA. I'm getting low on those now-discontinued Noslers, but I find that plain old WW bulk 55 gr cannelured jsp works pretty well too.
The ranch versions do throw brass pretty bad - there's the old joke about defending your own right flank - but you can get a smaller gas orfice to throttle that back some. A friend of mine did it, and now the brass makes a nice neat pile about 3' to his right.
I find them to be finicky about their ammo, but rest assured if you feed them right most of them will shoot pretty damn good.