Who has slugged their .303?

I used fishing weights and small wood dowl cut into 6 inch pieces, just keep adding them in the bore till it pops out . I put cloth on the end were it comes out so dosnt get marked on way out . I wrapped my slug in paper and subtracted papers thickness times two, as mine has a five groove barrel and seem to be tricky to get a good mesure it came out .311 and its old so just depends how much it was used i guess. Cheers
 
I'll chime in on this one.
Slugged my #4 Mk2 at .315, using an optical micrometer to measure the slug.

I hand load .308 bullets for my .303 and it shoots fantastic, just look at the pic.
(note: that's not a keyhole on the target, that's 3 rounds)
BTW, it shoots dead center and 1" high at 100yds, I assume the bullet is still stabilizing at 50 yds?
2013-11-14122826.jpg
 
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