mrbb

heavier bullets more
, for me have always worked better at long range, less wind drift, BUT a lot of things have to come into play at long range, than just bullet weights
bullets BC matters
as for better reloading advice, well, like many things the smaller details matter when trying to get smaller groups,
so weighing empty brass (and each bullet, be surprised the difference you will find if you do this)
and sorting it by weights can help, l measuring overall length on every case , you can also experimenter with different overall lengths of loaded ammo,(stay in the spec's per caliber) till you find the best for your rifle,
and then , like all ammo, is testing it at ALL ranges, as some times what is the most accurate at 100 yards isn't at 500 and such!
and again, keeping notes,
,togging how many times your reusing brass, and just measuring each and every load
best advice for learning to shoot at long range is lots of practice, and keep notes on things as you go, from wind speeds weather conditions, ammo, brass, primers and so on, notes help a lot IMO!
and
just , like anything else you want to be good at, , experience matters and the only way to get it is by putting the time in!
you cannot BUY IT!