That makes zero sense. I have a measurable data point in the FPS. If I was to take the FPS and change that I would be chasing my tail at long range. This is all a math problem and if we put in know data at the wrong value how would that help? I guess what I’m getting at is applied seems to vastly under rate hammers bc. If I was to adjust my FPS to match a 6” difference at 400 could you imagine what it would do at 1k. I’ve always had great luck find a bc that matches at 400 and it’s very close and easy to make small adjustments t distance.

Just curious if anyone else has seen this.

Besides the multitude of other issues that might have you off 6” at 400yards, let’s say it’s just the bc, did hammers advertised bc correct your zero at 400? I doubt it, it’s takes a horrendous amount of bc adjustment at that range. I bet you can double ur g7 value and it won’t move ur zero 1.5moa.

First step is double check ur zero.

Second step is check scopes tracking

Those still line up reshoot at 400, adjust ur mv to the drops, shoot at 600, tweak ur muzzle velocity, at 800 u will be close, tweak ur bc and mv so curve still matches earlier drops, at 1000 and 1300 tweak ur bc.

Bc is a degrading value as the bullet loses velocity and all bullets degrade differently, using the proper bc for your application is what will determine a successful drop chart.

But Goodluck