ive never seen a 45 colt conversion on an 1860 that had more than 5 rounds because there typically just isnt enough space for it, which is one of the reasons colt used a heeled bullet on a smaller case, so they could fit six... if the cylinder sizes are the same and theyve stuffed six 45 colt chambers into it, id suspect the chambers to be very thin walled
cimarron makes 1860 revolvers in 44 colt, and they sell spare parts for them, cylinders included... i would need to add the recoil plate / firing pin / loading gate piece to it though, which the conversion cylinder manufacturers offer, and they look to be compatible
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