ok heres a left field thought for you....go into $2 shop and buy bottle of nail varnish......use your 223 dial...and mark it with the varnish for your 400/500/600/700 marks......you shouldnt need to dial closer than that.... not sure how many 100 yards you will get in full turn of dial..... but not hell of a hard to do it without all the fluffing around with new dial.... but Im a cheap bugga.
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