Hello everyone- Many of you may know that I shoot a crossbow (gasp, tisk-tisk) and am a strong advocate of crossbows and am darn proud to shoot one. I began hunting with one 4 years ago to get in the woods more often cause we were living in two different housesand 'introduce myself to bowhunting' cause eventually I wanted to take up a compound. But a weightlifting accident and too many pitches in a baseball tournament kept me with the crossbow a little while longer.
But times have a changed and next spring Im probably going to be purchasing my brothers bow off him (Bowtech TomKat) and I have a couple questions I wanted to ask right off the top of my head.
A) As stated before I hurt myself lifting weights. Long story short- I did a lot of shoulder work, tried to max out on the bench and my right shoulder gave and I did something to some joint in the shoulder. Anyway- I've tried drawing my brothers bow and feel as if I can do so starting at a 60;b draw. But once I get to the break point my shoulder wants to pop out and back in again. I can come to full draw- it just doesn't feel the best

So, question: Do you guys do, know or point me in the right direction of some shoulder strengthening and loosening exercises that would allow me to strengthen the muscles needed to draw the bow.
B) With my crossbow, I use Horton Hunter broadheads. They are the G5 Striker but Horton bought the name or rights or license or something to rename them to increase their sales. Anyway, I absolutely love them. They fly true and stick hard and my question is, in an attempt to save some loot, is: Can I use these 'crossbow heads' when shooting a compound. Again, I would bet the farm that they are the G5 Striker and I screwed one into one of my brothers arrows the other day and there was no issue there. So what do you guys think about continued use of these?
Sorry for the long post, thanks for readin and I appreciate all your info!