wwhitney
In the Trades
Be that as it may, it is a technical violation of the UPC to use the 1056 (RC or not) above grade. It is listed to ASTM C1173, which is for underground use, and UPC 705.10 limits them to underground use.The rep basically said that would be a much stronger connection.
Chapter 7: Sanitary Drainage, 2020 Minnesota Plumbing Code | UpCodes
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The usual ASTM C1460 fittings for above ground use are like the Proflex, 1" long sockets on each end, with a stop. You might be able to find an ASTM C1461 fitting that is listed for both above ground and underground use; I've never seem them, but maybe they are available longer like the 1056 coupling.
If you want to be a perfectionist and square up the end of your cut, then like Fitter30 suggested, use a band clamp (hose clamp) around the outside to define a cut line transverse to the central axis, and use an angle grinder or saw to pare back the cast iron to the band clamp around the full perimeter.
Cheers, Wayne