What do the experts say?

[J. A. EARLY]

I'm shooting an ugly-bore NH 10 ga with SP wads and American-E shot (tungsten based polymer) and buffer but fairly low pressure. They claim the stuff to be safe, only slightly harder than lead. The next ones I load I will also add the mylar wrapper, but I see no apparent scarring, damage, and my barrels are about your thickness. With all of the plastic going down the barrel I wire-brush well after shooting. I had rather have thickness everywhere except the pits instead of a thinner barrel everywhere. Just my opinion. Others may disagree. Not an expert opinion though.