Would really need to know the make of the weapon before this can be answered.
Proofhouse.com has Winchester sn data that will get you in the ball park.
no the rifle is 85 cal and is second lowest to the pistols
marlin 35 cal. lever action. rifle/ Marlin makes the rifle ,but not the ammo for it.
Depends on which .50 cal, and which cartidge. If you mean a Barrett Model 82A1 sniper rifle, in .50 BMG, standard ball ammo is ABOUT 2800 fps.
what you have is a converted civil war 58 cal. musket. After the civil war those muskets were converted to 50/70 cal (trapdoor) center fire rifles. Later the 45/70 (trapdoor) came into being. Value depends on overall condition of the rifle................
a 30-cal rifle or sniper rifle. closer to 30-cal
Yes, but the patch would need to be thin, normally you would fire a .490 ball and a .15 patch, so a .10 patch in this case would be a good place to start.
No
When you say Air Rifle you are referring to a pellet rifle not a firearm. At present there are no 300 Cal air rifle being made.
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.
show me breakdown &parts for J.C. Higgins 22 cal. rifle
The rifle is marked .45 but they messured this from land to land inside the barrel not groove to goove. a .433 with a .18 patch seems to be the common load. 45 is just to tight for the rifle