What type of muzzleloading firearm is the most popular and most commonly used among hunters today?

Most popular types of muzzleloading firearms used by hunters today are the in-line and the caplock (or percussion lock) muzzleloaders.

in-line muzzleloaders is the Newest type of muzzleloader that is built so the primer or percussion cap could be set directly behind the charge in the barrel of the gun

The caplock on the other hand, is designed with metal percussion cap to generate power.