lots of CAS want to use cheap .38 brass long loaded for .357 lever actions.
CAS - A shooting style I have never seen nor pursued, but when in Rome,,,
I might have found one version of a bullet like that,,,
Will definitely take more research than the info posted below, and it
appears to be (eventually/sometime soon?) commercially available.
Unfortunately, this particular bullet is a SWC, so 'reliable feeding' isn't a given.
But,,, it's 'a place to start',,,
I found an opinion on a particular bullet mould. Take it for what it's worth:
I have owned this mould before midway existed it is a classic. I have casted many bullets with it and the real beauty of the slug is that you can crimp it on the lower crimping groove in 38 special cases and shoot it in 357s
I found that opinion by researching the mould number associated with a interesting bullet I found at Montana Bullet Works.
https://www.montanabulletworks.com/product/357-lyman-358156-155gr-swc-gc-dc/
(I couldn't find 'a smoother feeding' version of this on the same site, but it does give hope!)