I've 'tried' a couple, a 250gr SWGC and a 325gr SWGC in particular in my 444S. I haven't come to any definate conclusions on them, yet, as I've just started 'trying' them.
In the 444 lever actions as with the .45-70, the maximum C.O.L. is critical. Most of the loads I've tried or am trying are from my 3rd Edition Lyman Cast Bullet Handbook. The rest I've got from the Beartooth Bullets website.