Help
My buddy wants to switch 125 broadheads to 100 grain mechanicals.

I have run his set up through bowjackson.com with all the KE numbers and he has 52 ft #' s of KE so he does have the set up to handle it.

He adjusted his draw lenght now if he puts broadheads on broadhead touches his brace just slightly at full draw. Causing him to jump around.

Local shop out of 125 Mechanicals so they sold him 100' s and told him to practice with 100 grain field tips to site in. With less than 2 days to go before season I told him to skip opening day or drive to other shop. he shots 2 inch groups at 25 yards with 125 field points.

He wanted to know what to expect when he tries to site in his bow tonight with 100 grain field tips. I told him I had no clue, but my guess was his arrow would be higher and left then where his sites were since it is a bit lighter. Anyone have two cents worth they want to share?