Reloading question

[Sunray]

"...crimping make the ammo significantly more accurate?..." Nope. A crimp is detrimental to accuracy. A crimp does not make anything more uniform either. A crimp is only necessary in heavy recoiling cartridges and those used in lever actions.
Milsurp stuff was crimped because it may have ended up in an MG.
"...My dies don't..." It'd be unusual if they do not. It kind of like neck sizing with FL dies. Doable, but it takes some trial and error fiddling. Certainly isn't something to worry about either way though.

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[Micheal Doyne]

" A crimp is detrimental to accuracy. A

This is an interesting statement, I have found with my own reloading that all my lee enfields (and other .303s) group tighter with rounds that have had a light to medium crimp applied. I use lee dies, neck-sizing only on brass dedicated to each rifle and a lee crimping die. This improvement may be only due to another limitation in my rounds however I think as a blanket statement there significant evidence to the contrary in a number of instances.

I have had good groupings in the past with rounds un crimped and with almost no neck tension, however this was only when the rounds where loaded singlely and great care was taken during storage and handling not to disrupt seating depth. In general I found this to be impractical, as typically one or two in the group would be disrupted. Over all the best consistency I have achieved is with a light crimp.