?. Does anybody mfg. .20cal leadfree pellets.

I think you may be out of luck-.20 cal seems to be going out of style. You may want to stock up on your favorite .20 cal ammo. I shot .22 lead-free pellets made by an English company and they were great. They also made them in .20 cal, but I think they sold out to H&N and I don't see them available anywhere in the US.
dynamic-spc5-sp_4AEFAD3C_300.jpg

You might get lucky with a want to buy ad here-http://www.network54.com/Forum/79574, but hen's teeth are easier to come by new.....
 
"old20cal"Well it has been a hard search. Trying to find lead free .20, 5mm pellets. There is an indoor airgun range I would to visit. I do have have air rifles and pistols .177 and 22 to bring. But can not find a source for me old .20 Sheridans. Are they obsolete and will I have to swag me own. Any help is appreceiated. Thanks in advance, Old20cal.
If you want to make your own fairly easily, buy some Moldmax 60 silicone rubber from Smooth-on. You can get a trial size pot for $25. 

Make a mold of whatever .20 pellets you have. I suggest a multi cavity one to save time. Then cast your own pellets using tin or lead-free pewter. Tin and pewter can be melted very easily on a regular stove in a pan. I tried it recently. The tin went from a solid block to a liquid in 3 minutes. Tje moldmax 60 handled the temperature without any issues.