
These are it
Pretty sure these are the end kf a long search. Very low bounce, can take a beating, sand core feels really nice in the pouch.
Available by the half-dozen in 200 g, lighter weights only singly but 200 grams may be about right. Will let yall know. Lacross balls, my favorite except for the ridiculous bounce, are about 145g. These are slightly smaller which I prefer.
I will add that at sling speeds a lacrosse ball and certainly these will force themselves right through typical chain link fences. Please make sure you have netting or a proper batting cage for these. I imagine sand would work really well too as a backstop kr to measure distance.