During my CAS "career", I've used an odd pound or two of Goex cartridge,sveral cases of Elephant (2f & 3f), one case of Schuetzen (2f &3f), and now working on a case of Kik.
So far, I have no complaints on any...it all goes "Boom" & makes the target go "clang" rather than "pop" - "ding".
I've found either 2f or 3f to work satisactorily, but not optimumily, in all chamberings from .38 S&W to 45-70 and 12 GA.
Some powder measures / flasks may not work as well with 2f as 3f.
Local availability and cost are likely your limiting factors. As a beginner you may not be ready to commit to ordering a case (25 pounds) as many of the true-faith purchase.
Best wishes and
Enjoy the ride!Slim
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