Fireforming 500 A-Square

[francois_458]

Good day all. I am in the process of fireforming new brass for my 500 A-Square. Its 460 brass from betram already necked up to .510
Im having some trouble getting the brass to form. I'm trying to avoid using standard loads form the process (trying to save my shoulder and wallet). I am currently using about 14.5gr of Somchem ms200, tissue paper packed tightly as a filler and candle wax as a plug. This though is only barely moving the brass and it is nowhere close to forming to the chamber
Anyone else have some recipes or ideas that might work
TIA

 

[francois_458]

Thanks
I just tried increasing the powder charge and that seems to be working. I guess i was a little apprehensive about using too much pistol powder. 28gr of somchem ms200 and the same tissue paper and wax plug seems to be forming nicely

 

[Mark A Ouellette]

@francois_458 I tried to post a link to an article on Accurate Shooter but this forum software deletes links to other shooting websites.

Here is a YouTube video on using Cream of Wheat as a filler for fire forming.