I got the same info from Western when I inquired, Barnes knew of people playing with their 300 & 350 .411 bullets, no info. No reply from Hodgdon, I was thinking they may have had some info from Europe. I will be trying the 5744 with a 300gr LBT WFN-gc and a 400gr LBT LFN-gc with the 416 Gator checks once the moulds arrive, hopefully before Aug15. I got the Saeco 740 mould up to .412 with the Bleimeister shot blend, 406 to 407gr., so, maybe come the long weekend here I will try some trailboss with that. Another fella has run his with a 400LymanPB with 5744 and with blackpowder.
I shot some of the Hornady dgx loads in it so far, the ruger pad did about what I expected, 15 rds before the shoulder started saying I was a silly person. I have a limbsaver on it now. See if that improves it to a box qty before my shoulder starts talking to me again.