#5 lead will penetrate and kill turkeys at 50 yds. all day, everyday of the week.The real problem with lead at that distance has been pattern density, until now with the Long Beard shells. The claims of 60 and beyond by Winchester are just plain ignorant IMO, I don't even condone shooting then at 50. But I did misjudge yardage one time in a open swag of a field and rolled one at 52 with #5 lead so I do know they penetrate and kill at 50.
In ballistic gel at 50 yds.
#5 lead @ 1290 ftps. = 2.18 ft lbs. / 1.54 in.
#6 Hevi @ 1290 ftps. = 1.96 ft lbs. / 1.58 in.
Notice the muzzle velocity, it it the same for comparison. Got these numbers off a Randy Wakeman test chart. The LB #5 has a muzzle velocity of 1200 ftps. and factory Hevi 6's are 1090 ftps. So they are pretty neck and neck. That's a comparison to Hevi #6, and I know people who wouldn't hesitate to pull the trigger on one at 50 with Hevi #7's with even less energy and penetration.