my point was it can be useful to know down range performance. Would I use it for tweaking a BC for long range shooting, no, not accurate enough. That doesn’t mean it’s not a useful tool. I have both a garmin and LR. Garmin is the go to unless I need to do development work. Just easier to use and once you know the BC, it doesn’t change.
Btw running rifle bullets, although they are close to pistol bullets as they are 35 cal or larger. BC sucks compared to long skinny 6-7mm stuff. Also no 4dof files or anything like that as they typically are not used past 400 yards. Mostly due to low BC And heavy bullets. no one makes long heavy for cal bullets as recoil would probably be intolerable and chambers won’t handle the length.
The hammers were indeed .1 lower than published. That was the bullet that started the rabbit hole dive. It’s around .24 g1. It appears that Hammer did not take into account the hollow point and just looked at the shape when calculating BC. Almost the same bullet with a smaller hole, is only .02 off. Much closer and a full .1 better. I just happened to look at the down range velocity while working up a load and realize it was dropping fast. Faster than expected. i started to check all the bullets I had on hand, big difference between best and worst. .369 to .15 from best to worst, all 35 cal.
The .15 bullet didn’t have a published BC, just a minimum velocity (1400). I was really surprised it was so low. If I ever use them it will be in a pistol due to rapid velocity loss.
I also ran several bullets from Barnes and Hornady, those were right on published BC. It was the smaller mfg who either had wrong or missing information.