Interesting & good "score" however the mould is not a TC Maxiball like any I have seen and those are all sizes from.36 up to .54.
The rounded grease groove says smokeless powder. BP bullet moulds for grease groove bullets have square grease grooves. Looks
like a truncated cone .45 bullet for revolvers.
These are .36, 45 and .50 sizes of TC Maxiballs. In the past, I have owned the .36 and .50 sizes.