It's hard to say exactly what arrows your bow will like, stinkbelly. A starting point would be to just buy some 40-45 spine cedars and see how they do. You might find out your bow likes 35-40's better. It might like 45-50's better. There's some wiggle factor involved, and it takes some experimenting to get everything just right.

The good thing about recurves is, once you get everything just right, you take note of your nock height, brace height, arrow spine and length and you can get everything set right back up in a matter of minutes. You never have to go back to square one unless you make a dramatic change, like switching from dacron string to fastflight, or go from wood arrows to aluminum, or something like that.

Check your state's regs to make sure your 42 pounder is legal. Some states have a minimum 45 pounds. As long as you stick to shots within 20 yards, have good, sharp, cut on contact heads and keep your arrow placement in the heart/lung area, you won't have any problem with that bow.