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Are you sure your original stuff was 26 gauge thebishman ?

According to steam engine at an inner diameter of 3 mm and using 26 gauge (depending on the leg length of the coil) you get
3 wraps to give you 0.44 ohms using 'A'
3 wraps to give you 0.46 ohms using 'A1'

Whereas using 24 gauge you get
5 wraps to give you 0.46 ohms using 'A'
5 wraps to give you 0.48 ohms using 'A1'

which seems a lot closer to your original figures, though the other thing to note is there is not that much difference in real terms to the resistance of the two materials.

Edited to add - the above figures were for full wraps and will be slightly higher if you add an extra half wrap depending on how the coil fits in the atty

. ..................- Also - the resistance per meter is listed in steam engine as 'A' - 27.22 ohms per meter and 'A1' - 28.39 ohms per meter