Until I switched to Winchester X-tended's, my maximum range with lead was 35 yards. The pattern opens up too much IMO, after 30 yards, regardless of manufacturer.

As some have said, you will be amazed at how drastic your pattern changes between 35 and 40 yards. Most hunters also typically want a 5 yard "buffer" between judged distance and the actual distance simply because at 5:30am, with low light conditions, 5 yards is easily misjudged by most people.

Best bet is to get back to the board and test at 40, 45, and 50 yards.

If you cant---then don't shoot past 35 yards, preferrably keep it to 30, just in case you misjudge by 5-10 yards