Gentlemen...with over 25 years + reloading experience I always have and still still fireform using "cream-of-wheat" in all calibres from 17 REM to 300 WIN Mag...7MMSTW...308 , 260, 243 Ackley,22-250Ackley...20PPC , 20BR
have never had a stitch of problem light bulb
Bob @ Sinclair International order line uses cream of wheat and is a huge fan of this process.
I fireform ALL new brass using cream of wheat.
I've never had a misfire or usafe occurance using 700X powder and poly fibre capping (NOT WAX - THATS A MESSY-WRONG TECHNIQUE )
All my fireformed loads are developed with crisp shoulders.
Hydro dies are surely okay - but they're a custom item that costs money and time to obtain and limited to one particular calibre/rifle.
Its just another choice with same end-result.
Different strokes for different folks