In terms of accuracy I wonder if its that the post-ww2 5 groove barrels in mk2s and 1/2 - 1/3s were a better quality? and hence the mk2 / FTR'd were more accurate for this main reason. The trials rifles were mostly? converted to Ts? with pre-war 5 groove barrels? Ive seen comments that the 2 groove were not much worse than the 5 groove, but really if the 5 groove were dodgy by then as well. Ditto L42s? ie a better barrel?

regards