I load a 50gr cast bullet. With 2.5gr of Bullseye they get ~1,250fps to duplicate the velocity of the .22lr.
Though technically illegal to use (centerfire), it will do the job on squirrels. BTW, my rifle (cast bullet use... a Rem Mod-7 in .223) is very, very accurate with cast bullets.
However, velocities need to be kept below 2,200fps.
With 7.2gr of Unique, I get 2,000fps and 1" groups at 100yds. At 8.2gr for 2,300fps, I get "shotgun patterns" at 50yds.
I have two .22 moulds, I recommend the Lyman .225415 or the RCBS 55gr FNGC with gas-checks installed.
Expect to be able to duplicate .22mag performance. Enough for 'pigs', but way, way underpowered for "HAWGS". I've seen wild hogs run to over 500lbs... Most I've killed ran 150-200lbs. For these, a .30/30 or .35Rem or .45/70 was prefered where we hunt them (thick creek/river bottoms).
On the WMA's in small-game season, the 50cal m/l gets the nod as they are legal (even for squirrels.... go figure! only an Atlanta bureaucrat would come up with that !!!).