clr8ter,Finding out what rimfires like to shoot is very time consuming,and fun at the same time.
I have many rimfire rifles,and each one shoots ammo differently. I think I have 17 different 22lr ammo's,and I have shot them all out of all my 22lr guns,as well as the many types of 22wmr that I have for those rifles.
A Lead Sled works,but I prefer to use a Bulls Bag and a rear sand bag.With the sled,you aren't using your regular shooting position because you can't shoulder the weapon. This causes you to pull the trigger differently than normal,and won't give you a true accuracy while you are actually shooting the guns.
Besides the Sled is pricey to buy,and using the bags works just as good,if not better.
I just make a target with several 1" dots,and note which ammo each one is. These are 10 shot groups from my Ruger 10/22T at 50 yds.You can see that it likes some ammo's,and doesn't like others. I never adjust my sights/scope when doing these test.I don't care if they are off,I just want to see how they group.
When you find out which shoots best,then I adjust the sights/scope to the target.