Proofing Cordials

JonDistiller

I'm midway through proofing my first cordial.  The dissolved solids are high enough that I must use the distilling method.    My question is, the TTB videos for proofing cordials discuss a very small sample size.   I'm guessing it's assuming the presence of equipment  that can make use of smaller sizes.    I can't afford that yet, and am using the hydrometer method, and so I have to fit my sample into a container that my hydrometer will fit into.   My 0-100 prof hydrometer can fit into a 350 mL flask, but my fine accuracy hydrometer needs a wider container, so my sample size needs to be 1000 mL.   
When the TTB discusses adding distilled water to the sample prior to distilling, can I use the mL they discuss, or do I need to increase the amount proportionally to my sample size?

glisade

You can use any sample size you want...what matters is the sample size and the proofing sample are exactly the same volume (at the same temperature).
You can add as much water as you want to your sample but if you add too much your proofing sample may end up being larger than your sample size. The concept of adding the water to the sample is to use the water to make sure you rinsed out all the sample liqueur from the graduated cylinder, funnel, etc..so you collect all the alcohol that was in the sample. So you should just use the minimum amount of water it takes and you should be fine.