You hear it a lot, "I'm working up to" or, "How much do I need to kill an Elk or Deer", etc.
Too much Bow weight is often a problem that causes injury or long term problems like TP or Bad form habits.
The fact is; You probably just do not need to work your way into heavier weight Bows if you can shoot 40-45 pounds comfortably.
Your success rate will go up with a Bow you can handle comfortably and chances are your accuracy will go up!
I have killed Elk with 44 pounds,,yes but, I had my equipment tuned and my arrows matched my Bow. I also shot it very well because I COULD HANDLE it well.
You know being overbowed is a real problem and knowing when you are is also wisdom. Shoot what you shoot most consistently and DO NOT overdo your shooting. Shoot for quality practice and do it with a Bow that you handle well.
You know you should be able to hold at anchor for at least a few seconds without being overly fatigued. You may need to draw and hold a few seconds on a Turkey or a Deer,,,maybe even a Squirrel. Shoot the poundage you can shoot comfortably and your shooting ability will increase.