I wish you good luck with them. I'd suggest if you want to feel confident, test fire a fair number at cardboard or butcher paper at the ranges you expect to get a pattern.
They used to even market just the shot cups, which you could fill with shot of your choice and then load into your own cases. I used #9 shot (because I could just rob it from 12 ga shells.) Wow was it bad. OK, terrible is a better term.
I loaded up a full 50 of them and took them to a gravel pit owned by a club I belong to. It was spring of 1986, and I can date it because a very good friend had a heart attack in the fall of 1985. He wasn't allowed to do any constructive work, but had to be with the guys. I gave him my trusty M60 and the full box of them. He was instructed to shoot the blackbirds trying to roost above our covered patio (they crapped on the picnic table.)
We were out in the back 40, putting up a fence. Every so often we'd hear the M60 speak, and we knew Grady was OK. After a few hours in the sun we retreated to the patio to check on him and maybe have a cold drink (soda, I'm sure.) By then, he'd fired all 50. We were interested in his shooting skill, and more specifically, how the shot loads had faired.
His answer was not good. He had been trying them at 20 and 30 feet without much luck. The gunshots did manage to keep the birdies flying, but they all seemed to fly off, none the worse.
Finally, on his last shot be decided to stalk. He got under a near by tree and had one land on a limb over his head. At 6' he shot it. It fell to the ground, but was trying to get up, so he stepped on it.
Maybe it was my loading skill that failed me. Maybe not, I did use the recommended load.
I have used Speer loaded 9mm shot shells and they're both hot and kind of effective on the behinds of raccoons and 'possum. Also on my downspout on the covered part of my deck.
Like with most loads, check how they work to satisfy yourself first.
