If I recall correctly the BHP 40 is not a fully supported barrel either but not sure as I only have the 9mm.
I know I have 40"s shot from Glocks and after resizing I have never had a 40 stick. Maybe due to they are mostly factory once fired I picked up some time ago at the range and not loads that where hotter?? I have clearly seen the bulge. Maybe because I run all my semi auto through the LFCD but in theory it does not go down that far??
Just do not know for sure.
Now I need to dig through my 40 brass and find some
Summer came back for a few days so it's too damn hot to go to the swamp and shoot