Cctv rg59 coax cable

Hi,

Can any one advise if the rg59 coax the sell on screwfix is 95% copper braid.

As i stupidly got rg6 cable thinking it ok for cctv, but i cant get my bnc twist on connectors to get a tight grip of the rg6 cable.

So i am getting bad connections and need rg59, But i dont know how to tell if the rg59 they sell on screwfix is 95% copper braid

Many regards