I have three Enfields, a No.1 Mk.III*, a No.4 Mk.I, and a No.5 Mk.I carbine.
Of the three, only the No.1 will load properly with the stripper clips with any reliability. The other two end up with the cartridges rims overlapping wrong about 90% of the time.
The stripper clips must be loaded with the rims staggered properly to work properly.
I have so much trouble trying to use the clips that I just stick the bullets in one at a time from the top. Sometimes I will remove the mag and load it.