Thank you for the reply guys .

I have only just recently learnt how to load a shell the correct way & with a load close to what the rifle needs , I have tried Lighter/smaller balls with much the same results , I have only been working at 50yards as I'm still testing to get a idea of what is going on.

I did forget 2 things , with the front sight it came with (original I think) the rifle shot high at 50 yards , if I remember correctly 12in or so , maybe more & the bead was tiny like a rabbit rifle bead LoL !

On those groups in reality I suppose they are 3-4in apart from the centres & diverging , but I'm still trying to get the load & shoot through a crony , also I had no idea how to load the 12Bore case , most of that I have come to grips with now , with the help of some on this forum , Daryl has helped me immensely on this !

Gatsby has helped to & he was sending some larger bullets from his moulds , which I feel would have found the answer , as I cant afford to get a whole heap of moulds that do not work & I know a round ball at those speeds will kill any thing I want , so I just went down the round ball track !

"I would not worry about aerodynamics of the round ball, we already know they stink."

I meant to keep the ball more spherical so the ball can do what ever makes a ball work so well ?

If that is not a problem I will just get 2 moulds made up that are .005 over & call it good for now ?

Later I will try a larger/heavier bullet in the 12Bore Tolley to match his weight .

Oh , I thought 1 in 100in is more of a RB twist ?

My Bad here , got the 12Bore mixed up with the 8 Bore , 12 is 1 in 80in

Added pic of shots at 50yards & large rock at 80+ yards