I was of course wearing appropriate eye protection and "hurt locker" blast shield!
Not the ear splitting explosion and flying debris I was expecting!
little more than a hand clap, all contained in the loader.
think I have found the limit to fitting them with a wooden mallet!
There is a definite tone change when seated properly
I inherited 120 once fired Norma brass so set about prepping and priming it all. slow going but should last a while!