Interesting. More inferred data should come when I test the DIY 33 Grains of No.7 Smokeless Powder using the RCBS 200 Sil boolits. This will allow a velocity comparison between my current 30 Grains of BLC-2 with that Boolit and the No.7. From there; would be able to postulate what other powders may have similar performance. A portion of a Powder Burn Rate Chart follows:
Attachment 322579
Click to enlarge.
I have Lever-Evolution, CFE223, IMR4895, BLC2, WC748, and W760 on hand which should give us some ability to pin the area down where the burn rate is for the No.7 with Air Drying. Do not believe it is going to drop down into the WC860/870/872 range; but can do that too if needed.
Of course; will still need to determine why the Cooked and 20 Mesh failed to perform as described in the 1944 manual, and even failed to fire on one round. My current thinking is that 20 Mesh screening is too fine for the powder to burn; but that validation will be put off for a few weeks/months as I work with the moderate success of the Air Dried. May re-wet the Cooked powder I still have left; and air dry it to see if the Chemical remains valid after cooking and it can be recovered by establishing a larger grain structure.
A warning to anyone that tries to replicate my results; when loading the No.7 powder, I have been individually weighing and pouring via a funnel into each case. This No.7 powder inevitably "Bridges" and the funnel/case has to be tapped to break the bridge in filling the case. The Air Dried was less in bridging; the Cooked and 20 Mesh Screened was much more prone to bridging and takes a more forceful tapping of the Funnel/Case to get it past the Neck of the case.