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As I posted previously, I believe that the Meteor powder made in 1973 at the same location Curtis's and Harvey was made, Ardeer, Scotland is C&H formulation.  So I contacted wildthing, asking him to send me some of the Austin Powder Co powder.  Received the 200grs and did the testing in the previous thread for grain ratio and density.

Now, for the range test results:
Four 38-55 Austin rounds and 4 using Meteor FFg -
WW cases - Br2 primers - 0.004 Construction paper OPW -42gr powder - 0.235 compression - Ideal 375166, 320gr, 0.379 base (1:30) -  0.090 dry felt wad wad - 2.625 COL
Sorry, no targets because I forgot my range settings book
* Austin Powder chrono: Avg fps- 1121 with an SD of 17.9
* Meteor Powder chrono: Avg fps- 1129 with an SD of 17.6
I bore patched each round with a previously weighed patch that I later dried @150F to determine what the foul to original charge ratio is, plus be able to view the dried foul
* Austin powder foul ratio 4.46% to 42gr powder charge
* Meteor powder foul ratio 4.58% to 42gr powder charge
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The foul for both powders are the same (visual & ratios) - same very small micron size charcoal in the foul

Based on the comparative range test for the Austin(lot Dec 1955) & Meteor (lot  1973) … I am 99% convinced that Austin (‘markedCurtis and Harvey') & Nobel’s Meteor are both Curtis’s and Harvey powders with Meteor powder made in 1973 made from the same C&H formulation as the Aust

Found this on an auction site ... am now 100% convinced my Meteor powder is Curtis's and Harvey powder 
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Note wording:  Manufactured by Imperial Chemical Industries Limited (Nobel Industries) and MADE IN GREAT BRITAIN

Also on the same site was a can of my Meteor Powder with the sold by C-I-L, Plattsburgh, NY, the Canadian subsidary of Nobel Industries  
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