I've owned many original and reproduction Enfields because I prefer them to original and reproduction Springfields. I won the North Carolina State Muzzleloading Rifle Musket championship by 20 points last year with an original Type 2 Enfield 3 band musket. I think Enfields represent the apex of muzzleloading martial arms. The Parker Hale reproduction was a chunky copy of the British issued Type 4 which was never used in the War Between the States. Parker Hale's P53 used a finger joined forestock. The joint was concealed under the barrel band and frequently separated (seceded from the wooden union), leaving the owner with a "sporterized" or home guard musket. The rear sight was a twentieth century interpretation of the original sights but were not similarly constructed.
Euroarms was an Italian copy of the British copy. When English gun laws contributed to the closure of Parker Hale, EuroArms purchased the brand name and parts and continued manufacturing guns in Italy.
When Pedersoli offered their versions of the 3 band P53, 2 band naval pattern and carbine, they prudently chose to replicate the Type 3 variants purchased in large quantities by both Federal and Confederate agents. Pictured below is the bolster of a Pedersoli Naval pattern. It was not made with a clean out screw, nor is it threaded for one. Ignition is excellent and it is N/SSA approved.
I have never understood the often heard criticism of the Enfield's stock architecture. Admittedly originals were made in both Long and Short butt variations resulting in longer and shorter lengths of pull. Personally, I find the long butt design provides an excellent repeatable cheek weld. The front sights on all period muskets are too low and narrow for serious 50 and 100 yard X ring accuracy. I have had to install a tall front sight on all period muskets to achieve best accuracy. I would recommend dovetailing a taller front sight, unless you simply want to use the musket for living history and intend to mount a socket bayonet on a P53. Dovetailing a tall front sight will allow you to make windage adjustments and lower the elevation sufficiently to shoot accurately at 50 and 100 yards.
The rear sights are adjustable for elevation, and if you don't obtain a good sight picture at the lowest elevation, raise the ladder, and adjust (file) the front sight to shoot to point of aim at the desired range.
You should be able to shoot one ragged hole off a bench at 50 yards, and a 3" group at 100 yards.
I've had few opportunities to compete on paper beyond 100 yards but at 200 to 300 yards was able to consistently hit a propane cylinder sized gong.
Accuracy with an Enfield of any pedigree comes down to load development. All of my muskets are .577 bore. I size the bullets to .576. Lube with SPG and shoot 42.5 grains of Goex 3F.
I've owned 2 Parker Hale Volunteer rifles, and both were excellent shooters. The sights offered greater out of the box adjustability than Parker Hale muskets. The two that I owned were very accurate at 200 yards, but I sold both to purchase original Enfield P53's simply because I didn't have opportunities to often shoot at 200 yards. At 100 yards, I could do everything with a P53 musket three times faster than I could do with a volunteer rifle. I averaged one shot per minute with a volunteer and could shoot 3 times per minute with a P53 using prepared ammunition.
The styling of the volunteers was very attractive, but they were substantially heavier than P53's and could not be used in musket competition. Very nice rifles, but of limited competitive use for me.