Pictures are pretty, but I'm one of those old foggies who goes by what prints on the target. Have tried LP primers and over primer wads and all sorts of combinations these past 3 years. The CCI 200, no over-powder wad and the loads I've listed above are working well in my 38/56. The 40/65 I'm working with over the winter may be a different story, but I'll still go by what prints on paper. Am fortunate in living 15 minutes from my home club's 600yd range.

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SS, no argument that "what prints on the target" is key respective to the load, including the primer used, the quality of the powder and how it is compressed.  
But the brisance of the primer that starts the whole ignition chain to deflagurate the powder column is also a key.

Reading this issue of the SSRJ, a 2nd place score (193 out of 250) shooting 100yd offhand German ring target caught my eye:
Presume 1948:
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It was 'the black powder primer' that interested me ...
These primers were manufactured for with a very low brisance that was compatible to ignite BP properly.  Such primers are no longer made because the shooters of semi smokeless & smokeless complained that BP primers did not ignite these powders.  So with the the new nitro based powders and BP shooters converting to it - BP primers faded into history.  Now with the re-interest shooting BP in calibers created for this powder ... folks are searching for primers that don't 'whack' the grains and ignite the column for better avg fps and SD's. 
My LP primer of choice in addition to BR2's is Federal GM150M

PS: Very familiar with Cumberland Riflemen having lived 20 minutes from the gate.  Too and including working the 600yd risers in water up to my knees before the reconstruction.  I shot my 1st BP rifle rounds there one day ... A used H&R BC and was dumb as a door knob.  A Big Lube bullet with 52gr of Triple 7 - after 15 sighters at the 100yd - 5 rounds shot at 600 in 90+ heat & mirage resulting with 5 holes in the 7 ring.  5 3/4 x 1 1/2 with 3 holes that could be covered by a silver dollar.  Dan witnessed this target never to be duplicated again!

SS - would enjoy shooting LR again at Millville.  Between now and the matches would have to drive down and refresh some of my 600yd settings.  Haven't shoot 600yds in a long time.  Just skip from 200m-500m to 1000yds now and 100 to 300yds at Jackson.
When I lived in Marmora, I was at the range 2 -3 times a week for many years.  Even going back when every gun owner within 50 miles had a gate key - whether or not they were a member