I scratch hunt preserve birds. Those RGLs in #6 run out of gas at around 35 yds, IME. They are nice through tight constrictions when looking to open patterns a bit.

Beyond that B&P F2s are impressive. An Italian #5 is about US #5.5. Through mod/IM/F constrictions it swats these birds way past 40 yds and is what I use in my M-12 full gun when backing-up others. Their #4 is a true US #5, but I've never seen the need for it.

Sam