Tried out a few more loads with some refined success! Gave the lubed felt and cork wads a go. The few I tried showed immediate promise so I put together two different lots with two different loads of powder and wads to test. I wanted to begin with 75 grains of Swiss 1.5 but it took 78 grains to bring the powder level to just above the bottom of the neck when drop tubed. This allowed the vegetable wad to be compressed right to the bottom of the neck and the resulting powder compression to be .1250, so to keep it equal the 90 grain loads were compressed the same amount.

The felt wads are 1/16 inch hard density felt from Duro-Felt and soaked in Alox lube.
The FelPro brand cork gasket material measures .070


First lot, lubed felt wad.
Jamison fire formed unsized case
CCI BR2 primer.
Over primer wad, 40 cal size/.0015 onion skin paper dropped into case.
Swiss 1.5 compressed .1250 with a .060 vegetable wad
12 ea. 78 grains powder
12 ea. 90 grains powder,
1/16 inch Lubed felt wad
.070 cork wad.
500 grain swaged bullet patched with 9lb OS .0020 paper

Second lot, without lubed felt wad.
Jamison fire formed unsized case
CCI BR2 primer.
Over primer wad, 40 cal size/.0015 onion skin paper dropped into case.
Swiss 1.5 compressed .1250 with a .060 vegetable wad
12 ea. 78 grains powder
12 ea. 90 grains powder,
.070 cork wad.
500 grain swaged bullet patched with 9lb OS .0020 paper

The winner is the 78 grain load without the felt lube wad. The 90 grain load without the felt lube was just as accurate. The loads with the lubed felt wads produced groups about a third larger than those without the lubed wad. Also, I did not see that wiping was any easier with the lubed wad either. I can say that the Swiss powder fouling was much easier to wipe than the OE loads I had been trying.

12 shots 415 yards, sitting and cross sticks.
[Linked Image]

Believe the next step is to try neck tension, have ran some through the Meacham neck bushing die with the bullet seated in the case. Without sizing the neck the patched bullet slips into the case easily but will fall out if shaken. Running the loaded case into the die with the same size bushing as the fired neck provides good tension and the bullet can still be pulled out but takes some effort.

Anymore recommendations?