Didnt know where else to ask this... I have never shot over 125 grain broadheads. I was wondering, as I made a bow that is 42 lbs at my draw weight, Would it be better to shoot a heavier broadhead when hunting. Would I need to lower the arrow weight when i do this or can I just shoot the same arrows? Or are the heavier weighted broadheads made for heavier bow weights? Just asking cause I simply dont know and never really thought about it as I had what works for me. I might not even change what I have, just wondering...

Sure give it a try. I think your 125 grain heads if you are not using a heavier insert are too light.  A heavier arrow weight will get you more penetration which is even more important with lighter draw weight bows.

Adding the extra weight on the end will definitely change your current arrows performance though and you may have to go up to a stiffer arrow or cut your current arrows shorter a bit if possible.

I actually think 125's are fine I killed My first 75 deer with them on POC shafts. Probably 30 were with 50lb selfbow. That said I do believe that 160's are better. I shoot 250 or more on carbons. There are a lot of combo's that work.

160's will work fine from a 42 lb bow.  Going up in point weight to a 160 might have you needing a slightly stiffer (or shorter) shaft but you may do just fine, too.  The easiest thing would be to pick up some 160 gr field points and shoot them.  You are only adding 35 grains to your total arrow weight, it's really not that much.

Thanks guys - 35 grains SOUNDS like a big diference but I guess when your measuring in grains its really not that much. I just know a lot of compound guys that are so crazy over their arrow weights and where the weight is on the arrow that I keep thinking I need to be more precise. Probably makes more dif when your shooting at 70 lbs than 40 and i've never been a speed freak... Course i have had a deer "jump the string" before but that was with a compound bow shooting 280 fps so...