This comes up all the time.
"Lead" ones are not just straight up lead they are covered with wax.
99% of all match grade 22LR ammo is going to be wax coated not plated rounds.
Such as eley, you know the stuff they shoot in the Olympics thru their super accurate super expensive rifles. If wax is good enough for them its good enough for you.
IMO wax coated bullets leave less residue then plated.
But it is a highly touted myth that they are worse.
Izzy is right, there is no jacketed 22LR ammo, they are either plated or "washed" which pretty much means painted on...
All that said I run 525 Blazer Value Packs thru my 22LRs pretty much exclusively. (Other then match ammo)