I agree in threece. A 7.5 pellet of Hevi-Shot is as heavy as 6 lead and has nearly the same knockdown. I LOVE em in my triplex Nitros. Leadwise tho, if you had at least 1 3/4 oz of it (3" or larger) shot a VERY tight choke and kept shots inside of 40-45 yds then you probably would be ok. If you are wanting something with a hellacious density that no mosquito could fly through then call "Nitro Ray" and have him build you an all 7 Nitro load. He can load you 2.5oz of 7s that will just VAPORIZE anything within 50yds.

Good luck,
RA