Does it really save you a lot of money? If you have to shoot several rounds at three different distances to estimate your velocity, then I'd think you'd be shooting significantly more rounds and therefore using up significantly more powder, bullets, and primers. Don't kid yourself—that adds up quickly.
No it doesn’t, but if I have a load for say 25.06, 117 gr. bullet that I chronograph @3000. Therefore 2” high at 100 will give me dead on at 200 and 7” drop at 300 theoretically. The proof is in the pudding at those distances by shooting to confirm the drops.
Now if I don’t have a chronograph and the book says 3000 fps for that charge, caliber and bullet, I zero at 100 and the bullet drops 3” at the 200 and 9” at the 300 then I am not getting 3000 more like 2900- 2950. So you are just basically working backwards by using known drops at distance to determine velocity rather than confirming drops at distance with a known velocity. As I said it’s crude but works
