Strictly speaking the decimal point should be present when written, but we often drop it like we do in speech. Same thing happens with gun calibre, eg. 303, 350, 762, etc.
10.50 and 11.00 are so close as to be considered the same, eg. 10.50 x 20 and 11.00 x 20 were both CMP spec.
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One of the original Australian CMP hunters.
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