I have a Lee-Enfield No. 4 from 1942 with the earlier micrometer sight. Fold it down, it becomes a fixed ghost-ring sight, more or less. I am going to copy the military load to keep the range measurements on the micrometer accurate.
For unserious 3-gun shooting (eventually), and less-noisy plinking, I intend to come up with a lighter load. I'll probably use 125-grain 303 (0.312" diameter) bullet or a 123-grain bullet for 7.62x39mm (same diameter, I believe).
I don't care too much what the velocity is since I don't have to kill anything. My intention is just to get the right velocity to match the battle sight at a given range (probably 100 yards).
Question is, if my point of impact is too low, should I be increasing velocity (so it have less time in the air, to drop), or decreasing it (so it will have more time in the rising barrel and thus have a higher trajectory)? Do you just have to guess?
Next question is: I've heard you can go much lower in velocity than you should, since you reduce it too much and the bullet won't leave the muzzle. What velocity is too slow to shoot for? If I shoot for 1200 fps, am I safe?
(I'm new to handloading and so far have only copied military loads.)