Haven't had that hard of a time with rl series here.... I've got plenty of rl22 ( buoght over the last couple of years). I've only had to look for rl25 lately though I guess.
Wideners has rl50 and powder valley has rl33 at present but neither has rl22 or rl25 at present.
if you use a heavy rl33 will work for you just fine in the rem.