Hi Rex
I do not own any of the models you mention, but it is not uncommon to find that some pellets fit loose when you load them.. Some say this not a good thing and some say not to worry about it. What counsts is the accuracy. I have some springers that a certain brand of pellet fit loose in but in another identical model they will fit snug in..
Also some will tell you that you will need some quality pellets..

This depends on how seriouse you are about shooting a bulls at 30 to 40 yards consistantly. If you are just plinking, I would think any pellet would work.. Besides your rifles will show you what they like best when you look at your target... hehe
But for sure there are high quality pellets out there and poor quality pellests. And every air gun only likes certain pellets.. I won't recomment any pellets for you to use, because this is for you to determine yourself what works best for ya..
Good luck
Gene