Postman

Geoff McDonald - Woodleigh doesn't like AR2208 in the big calibres, reckons you get pressure spikes with it.

Personally, I have taken his advice and never used it.

I use 2209 and 2213 as the two.

As I have said above, use a slower powder.

Interesting you say the guns factory target was with a scope and you are shooting open sights. Do you have the scope and I wonder if that target is two shots from the right barrel ?