The powders to look at are 2208 and 2209. 2209 is presently being considered the "in" powder for target work. Grains will depend on what projectile and also barrel resonance if its a No1, No4 or No5. A pattern 14 (No3) wont care too much.
If its a No4 say somewhere between 39gr and 41gr 2208 on a 174gr target projectile. I know some ppl are using 47gr of 2209 but I have not tried 2209 yet so cannot comment. Start light and work up as per normal.
An Enfield also wont like boat tails very much if its throat is worn which is usual.
A std No4 in good nick should do 2MOA at 100yds and a good highly tuned target one 1moa but they can be cranky f*ckers frankly.
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