As the topic was comparing shotgun to rifles, I have to assume we are only discussing distances where shotguns are ethically effective. I think most members here would agree that limits range to around 150yds.

While I am too tired to do the exact conversions, it looks to me like the Remmington Core Lokts have virtually identical trajectory to the 30-30's out to that 150yd range....Possibly even flatter. (The Rem data has a 150yd zero, while the 30-30 data I am looking at is for a 100yd sight in, as I mentioned I have no interest in doing the full conversions, I think even a simple review of the charts will prove my point.)

While I know your comment only related to trajectory....Cleary, given the fact that both trajectories are almost identical, from a purely ballistics pespective, the Remington Core Loktsis a far superior choice tothe 30-30 delivering over 20% more energy at a distance of 100yds. (Recoil however is another issue however..)