Sorry I can't offer much regarding ammo yet. I initially fired about half a box of Winchester DynaPoint 45 gr rounds but knew immediately I didn't care for them as I couldn't shoot anything resembling a reasonable group. At the time, that was all I could find locally so I tried a box. Since then I've read many bad reviews on that ammo and similar reports about grouping or lack of it.
I went to the Federal Game-Shok 50gr JHP rounds and they are shooting well for me. I'm able to get pretty consistent 1-1.5 " groups at 100 yards off a table and lead shot bags for a rest. We have a growing coyote population here. The max shot in the open field behind my house is right at 100 yards and I think the 22 WMR will do the job.
My wife has run into three of them so far while out walking the dogs on the property and asked me to teach her to shoot a rifle. The 22 WMR was a nice rifle to get her involved without subjecting her to any significant recoil. She has learned quickly and can shoot a 3-4 inch group at 100 yards already. I keep a Browning A-Bolt in 243 WSSM handy by the door as a backup, but it's not a rifle she will shoot.....
It was all the reason I needed to buy another Marlin

and I have always enjoyed the 22 WMR round. The 983 is a sweet rifle.

I have ordered a few boxes of :
Winchester Supreme 22 WMR 34 Grain Jacketed Hollow Point
and
CCI Maxi-Mag HP 40 gr JHP
But haven't shot either of them yet.
I was surprised how hard it was to find 22WMR ammo around here. I'd appreciate hearing back on your experience with different ammo once you get a few rounds down the barrel.