I'm not saying it is the best because I haven't tried any other bullets except the Lee#90481, a 500 grain Minie, but Lyman makes a bullet specifically designed for the Enfield. The last letters in its part number are PH, standing for Parker-Hale. The Lyman part number is #575213PH.
When I bought my last Parker-Hale, 100 bullets and the Lyman molds came with it and I must say, they shoot very well in all of my Enfield Repros.
These bullets are 566 grain with 3 grease grooves. The cavity is a shallow flat bottomed shape being only .225 deep and leaving a .060 thick skirt where the cavity meets the rear of the bullet.
The Lyman PH measures .576-.577 in diameter.
For comparison, the Lee 90481 has a cavity .465 deep with a .053 thick skirt.
The Lee bullet diameter measures .577.
When it comes to loading, the Lyman seem to go down the bore a little easier than the Lee
I suspect this is because they are slightly smaller.
The Lymans are notably more accurate in my P-H's and I suspect the shallow cavity and the thicker skirt may be less likely to "blow out" as the bullet leaves the muzzle.
No doubt about it. The Lyman molds cost more and you have to buy the Large handles to use them.
The Lee molds of course give you everything for around $25.