@lizz – You dont need maths to use it – I’ve already done all the maths-y bit, you can just fill it in. It’s what I wrote when I discovered there wasnt a suitable pump biased logging set up – all the available ones are more intended for MDI, so being a bit of a geek, I wrote my own, which is available for anyone to download and use – have a look at http://www.shootuporputup.co.uk/groups/shoot-up/forum/topic/the-ultimate-logging-solution/ – Tim posted my excel sheet there.
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