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I would suggest all of you to NEVER use the "Downrange" copy of the 12S3 because the gas seal on bottom is not large like real Federal but smaller diameter like Winchester only with a heavy lip edge so it dont flair under presssure to seal like the winchester does --- Downrange 12S3 copy thus gets blowby around the wad and does not seal in any hull and doesnt work good for even just shot loads
If you still have some of the downrange versions you can use them in tapered hulls with decent results. That's what i did with them til i found someone willing to take them off my hands. The claybuster copy actually has a better fitting gas seal than the federal, but the overall fit isn't as good and of course as you mentioned they are only useful for shot loads.