I use Barnaul FMJs, 174gr flat base, 32cents each. I use them for target shooting to 600m on my no4 mk2s. A standard no4 mk2 should do 1 3/4MOA at 100yds, good accuriased ones get to 1 inch MOA. No4 mk1s about 2inch MOA, though the T's were better. I suspect its a quality control thing from war time production and how good a barrel you got/get ie the wartime ones were rush jobs and sometimes not very good. If you are getting worse there is something wrong, often bedding or bore wear.
Service rifle has classes so its say 10 x 303s shooting against each other and not 303s v AR15s. Of course at 500yds+ the .223 AR15 is no where, 100m and they are impossible to beat.
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