The mags are called for with H110 and Lil Gun, but some years back tests showed erratic results with 2400. The results were published in HANDLOADER IIRC. All .357 data in the Alliant handbook is with standard primers. Check out the data on Loaddata.com (you don’t need to sign up to see primers,OAL etc). I just took a peek and their data uses standards except for the two mentioned plus another, A-11 FS.
Do what you have to, but be aware and careful.
