I've used Golden Sabre defensive ammunition in some of the major defensive calibers over the years (9mm, .40 S&W, .45 ACP, .38 Spl +P & .357 Magnum). I've always received good performance from them, whether bought at my own expense or as issued ammunition.
I have noticed that they tend to send off "sparklers" (burning embers) in the muzzle blast at times, at least in a couple of the pistol calibers, which are most noticeable during low light shooting, and they seem to be as "dirty" as less expensive bulk-type loads. Neither condition really bothers me.
I haven't asked the Rem LE distributor about their new GS loads packaged as the "HD" line (since we don't use them, but have been buying the standard GS line in 3 pistol calibers for duty ammunition the last few years).
I was reading on one of the forums, though, where someone claimed they had contacted Rem to ask about it. They reported being told by Rem that it was a less expensive line because it didn't use their normal sealant on the bullets inside the case mouth or around the primer cup. Maybe they don't expect folks using it as "HD" ammunition will need the extra water proofing offered by their sealant. Dunno.
If the info is accurate, maybe they simply thought they'd save money by dropping a step during production. I could see potentially see the thought process that might result in less perceived need for "HD" ammunition to have the same resistance to water contamination that would be considered a benefit for duty & hunting ammunition (exposed to harsher, more variable climate conditions).
I obviously can't vouch for the accuracy of what was posted, nor did I contact Rem to confirm it.