I'm really only learning about this stuff myself (just in the process of trying to acquire a Taylor's 56-50 carbine) but have noted (as you have, likely) that the Starline listing specifies "56-50 SPENCER (TAYLOR'S)", implying that it is not suitable for originals.
I seem to recall reading somewhere that there is a bit of a rim-thickness difference between what works best in the originals and in the repros ...
I pretty sure I saw (while browsing the 'Net just in the past day or two) at least one vendor offering pre-loaded ammo in four different versions, i.e. both smokeless and BP loads for both repros and originals (converted to centerfire, I presume) ... but now I can't remember where that was!
If we could track that info down, you could maybe contact them to ascertain what the difference is - and maybe get brass from them...? (If they won't sell unloaded brass, you could buy some loaded rounds - price didn't seem significantly more than unloaded brass, as I recall - then use the cases for reloading ...
On the other hand ... can anyone answer the original question ... i.e. whether Starline brass can be used in original Spencers?
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