You could have used 350-400 w/no issues.
For 10 sheets 500 will work but if dilution is a worry, add a little more. This won't strain the motor and you can always move the 'crow's foot' out of the way and do a mono directional agitation. The results are the same and I've tested it with the densitometer I sold here. I've just moved to Bangkok and don't know where all my tests are to supply a visual aid so take my word for it.
I've switched to using mono directional agitation for all my large format (3005/3010) to reduce motor strain.
At normal rotational speed, it doesn't seem like the amount of chemistry that drains from a chamber would be impacted by the presence or absence of film. By the way, thanks for that video, Greg!
Great, great info guys, thanks!
It just so happens I used up my last 1L packet of D-76 and recently got in a shipment of 10 5L Xtol kits ( have about 20 1 gallon D-76 packets for other films ).
I am moving to Xtol for my TMX anyway so this will be perfect...
I have increased my amount of chemistry lately and getting better negatives. With Xtol I use 50ml stock pr 4x5 sheet, that is double the minimum than Kodak suggests. If you go for the the absolute minimum you are not getting the best out of your negatives.
Had another thought about the minimum volumes required being different for colour and B&W. The concentration for the E6 and C41 kits is fixed, so perhaps the volume of the drum was designed around that, i.e. 330ml for 10 sheets is close to the minimum amount of chemistry for satisfactory development. With ID11 (my usual developer) the amount of straight developer required for 10 sheets of 4x5 is 250ml, which might be less than the volume required to properly cover the sheets during development. To get to 330ml the options would be to use 33% more straight developer than required or to dilute it. The first dilution factor with published times is 1:1, giving 500ml of chemistry. It might just be that enough of the usual B&W developers were the same so that it was easier to call 500ml the B&W minimum so that people could just use published times and dilutions. I'm sure there would be plenty of less experienced people who if told that 330ml was the right amount of chemistry would then tie themselves in knots trying to work out how to achieve that figure.