Probably not, they weigh 800+ grs and most consider 190 grs of powder a MAX charge.

I don't think they would want to chance loading it at say 220grs of any 50 BMG powder. Or a higher charge as theirs isn't known at this time.

You can weigh the case, should be close to 900 grs. The S/T's weigh 833grs +/- a couple grains.

Whatever the difference is will give you an idea about how much powder they're using in their ammo.

I will post this again as a warning, one of the guys that myself and MrBen shoot with had loaded up some ST's. He was shooting them and I noticed that the muzzle brake was ringing on his AR-50. That and the muzzle blast was way more than usual. I asked him what he was shooting (that's how I found out they were ST's) and he said spotters. My next ? was what the powder charge was he was using and he replied 220grs of 5010!!! Me and MrBen took a few extra steps back after telling him that the MAX charge should be 190grs.

I will say that seeing an 833gr bullet shoot flat coming out of an AR-50 is pretty damn cool! Would I do it in my AR-50? Fuck no! Just hearing the muzzle brake ringing was enough to know that the limits were being pushed. And NO, I wouldn't suggest anyone on the board to try it either. That's why I posted it for anyone else that's planning on loading some up. Be safe, not stupid! That's a grenade next to your face that can and will fuck you up if you don't respect it!

There is no reloading data for spotter tracers in a full size 50 BMG case. This is data that guys have worked out over the years to keep people from blowing themselves up.

You can probably get away with 200grs but I wouldn't go any higher than that. The ST's weigh in at 833grs and sit deep in the case. Be safe.