Diana 56TH. Scoped.

My experience swapping between H&N and any other softer leaded pellet is that the harder H&N lead can effect what is used after it.

I read an article where it was proven that the barrel needed cleaning after H&N if you were swapping pellets. So Maybe if, as your list says, you used JSB after them, the JSB could be better but were effected by the harder lead.

Just a thought, but I had noticed a few years ago the definite change in the H&N pellets when they got harder.

I live just outside of Feilding if you fancy a shoot?  I love those 56th's and other Diana side-levers... great rifles!

Drop me a Private Message (PM) with your phone number and we'll arrange a get together if you're keen.

Cheers....