It all depends on the gun and general range you will be hunting in, I use in most of thecap lock guns 75 - 80 grains of 3F Goex and a 320 grain lead maxi-hunter bullet or a patched round ball. ( good to about 110 yards) With my .50 cal flintlock I use 70 grains Goex 3F and a hand cast 175 grain round ball. (good to about 100 yards) With my T/C Triumph in-line I use 90 - 110 grains of Goex Pinnacle powder and Winchester 209 primers, with a 230 grain jacketed sure fire sabot (good out to about 150 yards.) I have taken deer, hogs and even coyote for years with those loads. That should give a start point but you will have to find "the sweet spot" for your gun, The best balance of range and accuracy.
100-400
1:28
60-300
Contact the maker of your rifle for their instructions. It will depend on bullet weight. Assuming you mean a .50 cal MUZZLELOADER- and not a .50 Barrett- between 75 and 90 grains of ffG black powder is an average load for a patched ball.
100-300 USD
You need the services of a gunsmith
You can find parts for your 50 cal CVA Apollo muzzleloader at various online retailers specializing in muzzleloader supplies, such as MidwayUSA or Brownells. Additionally, CVA's official website may offer replacement parts and accessories. Local gun shops or sporting goods stores that carry muzzleloading equipment might also have parts available. It's a good idea to check forums and community groups focused on muzzleloading for specific recommendations as well.
Depends on the load
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Depends on the load.
hard to tell without seeing it but if it's a flintlock,in very good condition,$250-$280 seems reasonable.The one I'm thinkig of has a 29" bbl,50 cal.
Depends on condition and any accessories. Value range from 100-200.