Quoted: try this.
biggerhammer.net
its a place to start. just got together this weekend after a gun show with some local arfcommers and some of them were talking about the 50BMG uppers and 50TracerSpotter? or something like that. biggerhammer.net is the first place to go or maybe the fifty cal vendor links page fcsa.org
good luck.
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Hijack Warning:
FYI: There is a .50cal Spotter/tracer round. It is about half length of a full sized .50BMG round. It is most often used used (or was, it's been a while for me) on 106mm Recoiless Rifles and it was designed to duplicate the trajectory of the full sized 106mm RR round. A mag fed bolt (there may have even been a semi-auto version) action .50 cal tube (M8) was mounted on the main RR tube, a spotter round was fired and, if it were true to the target, the main gun was fired as fast as the gunner could react. An experienced gunner could tell while the tracer was still in the air and have the main round "on the way" before it hit. Range was about 2,500-3,000 yards.
Some shortcomings were that the spotter round announced to the target, the it was about to be tagged and, as with most all tracers, could be backtraced to the source. These setups could be found on the USMC M50 A1 weapons carrier (named Ontos) that had 6 106mm RR mounted, three per side. BTW, RR are not "recoiless" and the back blast was as fierce as being in front of the damn thing except there wasn't a HEAT round involved.
The Ontos units used in VietNam were used to destroy bunkers using HEAT and HE rounds. There was also a "Beehive" round that had hundreds of flechettes in it's projectile. It acted like a super shotgun and would clear a path over a football size with a single round. As with most of these type rounds, an area clearance (permission from further up the chain) was required to fire off a beehive round to make sure "friendlies" were not in hte area. It was a baaaadddd ass round.
My apologies if that is more than you wanted to know.