I never hunted PA rattlers, but I spent my youth chasing snakes of every other kind. Do some spring scouting if you can. This time of year they are still piled up in dens. Look for rock faces on the east side of the mountains. Sun = hot rocks, hot rocks = snakes. If you find a den, be careful. For every snake you see there will be two you don't. Also pay attention to food sources. Areas with good squirrel/ rodent populations should produce more than those without. I don't know if this works for rattlers, but I used to have good luck along train tracks. The railroad ties and large gravel seem to be appealing. The large concrete slabs near bridges and tunnels make for good sunning spots. They can disappear quick so be fast(and careful).
I may try my hand at timbers this june as well. I started building wood bows last spring. I really want to back an osage bow with timber rattler skins. A nice snakey piece of osage backed with skins is one of the most impressive looking bows you can make. Good Luck.