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A duplex load, as I understand it, is two projectiles in the same cartridge case. I have no knowledge of mixing powders in a case-it sounds dangerous and I have read time and time again never to mix powders, as the resultant combination is not predictable. Seems to me that you're using an older, dirty burning powder in comparison with the so called latest and greatest. I suspect there are those who reload for the 45-70 who could give you some guidance on what burns clean for your particular application.
I suspect that while WC 852 is a fine powder for the 06 and possibly for the 308 (no reloading books in front of me, so not quoting gospel here), the reason you may be finding unburnt powder in the action and case is because the powder does not have sufficient pressure to burn correctly.
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