You might want to look at this site. These guys shoot at 1000 yards with cast lead.
It's not as simple as just casting boat tail spitzers and shooting them in your 300 Rem Ultra. Lead doesn't take kindly to that kind of treatment. The group aggregates can give you an idea of what accuracy is possible with cast lead. Compare it to 1000 yard NBRSA match aggregates. It's aggregates which win matches. Small group records are mostly just statistical anomalies though they still require good equipment and good shooting.
Lodi Match Records
This site has a lot of info on equipment and cartridge preparation too. I do some cast bullet shooting (Browning 30" 45-70 BPCR and an original 34" 50-70 Rem Rolling block) but I'm a novice at it. Sure, you can use cast bullets for hunting and you can use (appropriate) smokeless powder in the same cartridges. At least cast bullets expand well at low velocities and they were used for deer, elk, and buffalo for around 50 years before jacketed bullets and smokeless powder (mostly) replaced them. Cast lead needs to be treated gently though. The reduced velocity will cut what "long range" means roughly in half. The longer time of flight affects both wind deflection and vertical stringing. The latter by the square of the time of flight. (drop = 1/2 G t^2 where drop is in feet, G is 32 ft/sec^2 (the acceleration of gravity) and t is the time of flight. Gravity may be repeatable but muzzle velocity and wind velocity are not.
"Its not Rocket Surgery.....'
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