Bulk prime with DME question

[Nick667]

I was thinking of bulk priming with some DME I hve in the fridge. When I ran it through the priming calculater it came out almost double what I would normally use if using cane sugar.
EG. 24lts @ 2.2 vols, 18.5C, = 119gms cane sugar, 227gms DME70 AA, 212gms DME 75AA.
Are these volumes right and what is AA?
I use Aussie Home Brewing . com calculater.

 

[manticle]

AA in this instance is likely apparent attenuation.
You definitely need more. Double surprises me though.

I used to use beer recipator but the link is defunct. Brewers friend tells me around 185g for 2.2 vol, 18.5 deg, 24 L.

 

[Nick667]

Thanks mate, Why are these numbers so different between calculators?
When I started measuring out the DME it was a large pile even at half the total quantity so I put it back and went for the sugar. My brain cell could handle a number like 185gms.

 

[manticle]

Only reason for the difference I can fathom, is a different way of working out residual co2. Try 3-4 calculators and either go for the common figure or a median or mean.

 

[Lyrebird_Cycles]

Edit:

I just ran the numbers through my calculator and I think the sucrose calculation on Aussie Home Brewer is incorrect. Using your figures I get 142g sucrose and 220 g DME at 68% by weight fermentable extract.

 

[manticle]

Only you do that though.....