Hoppes has a 4 piece aluminum cleaning rod with their inexpensive BP cleaning kit which may work better than a wood ramrod since it has a swivel handle.
Some rod accessories may need an adaptor to fit. Use a muzzle protector along with metal rods.
Obtaining accuracy with patched round balls [PRB's] is not an exact science. The thickness of the patch, the diameter of the balls and type and amount of powder need to be experimented with.
Start with the lowest charges at about 50 yards and then increase the powder charge in 5 -10 grain increments until the best groups are obtained.
Then move the target out to 75 yards and see how well the groups hold together before moving out to 100.
Only increase the powder charge the amount necessary to keep the groups together at the longer ranges.
High velocity hunting loads won't usually be as accurate as moderate velocity target loads which are intended for accuracy rather than for being lethal.
777 powder usually only requires light compression when ramming the PRB home for more consistent velocity.
When shooting PRB's, not many guns will shoot it's best groups at 100 yards.
If a person can hit a paper plate at 100 yards with consistency then I consider that to be
very good, especially if shooting offhand.
Many carbines can only shoot groups twice that size at 100 yards, and some not even that well.
Longer barrels are usually more accurate and have a more precise sighting plane. The load, cleaning regimen between shots and even the patch lube and barrel temperature can play a role with obtaining good accruacy with some guns.
Muzzle loaders are pretty well known for producing shots that are flyers, even if it's not the shooter's fault.
That's just the nature of shooting PRB's and muzzle loading in general.