mixing LME and Spraymalt

[leigh1919]

The recipe i am going to do tomorrow morning calls for 7lb (it's a calif commons, so american measures) of pale malt extract.
went out and bought two cans of brupaks PME - but this adds up to about 6.6lb (by my reckoning) - i have spraymalt in the house - can I add that to make up the diff? Would I simply mix it up as usual and add to the weight required? Or can i get away without adding it?

[prolix]

the difference will result in a 0.2 drop in alcohol against maths I refuse to do at this time of night so don't worry. just make 94.28% of the volume..... now look what you made me do! and your working in imperial measures and there are no decimals in imperial so is that 6lb 6oz?!!!!!! stop it metric is there for a reason.

chuck in 250g of spray malt or in imperial half a ferrets testicle worth plus two hedgehog droppings weight three days dried

[ADDLED]

chuck in 250g of spray malt or in imperial half a ferrets testicle worth plus two hedgehog droppings weight three days dried

If you're going to use the archaic zoological system of measurement then its imperative you make it clear as to whether you mean adult or juvenile testicles and droppings. The size differential can have serious adverse effects on gravity of the finished article, not to mention the off flavours caused by overuse of dried ferret sperm. Im surprised a senior brewer such as yourself would give such misleading advice.