Reportedly new triplex 5.45mm rounds for anti-drone use.
From the highly credible source of some guy on Twitter:
High-Precision Complexes Holding has begun rolling out the first batches of its 'Многоточия' (Ellipse) triplex C-sUAS rounds. These are the СЦ 226 (STs 226) in 5.45x39, and the СЦ 228 (STs 228 in 7.62x39. Claims hit probability is improved by a factor of 2.5x at 300 m.
that just sounds like a worse shotgun with extra steps.
I'll take one in 12.7mm please, bullpup if you have one available.
There is validity to trying to make ammunition variants for weapons already being carried instead of introducing a whole different weapon.
The next step up would be something like an underbarrel anti-drone weapon. I'm honestly surprised not to have seen a scattering type load for a GP-25.
I've heard about a 40MM grenade loaded with buckshot that got fielded in Vietnam in some small number.
Yes, M576 buckshot (and some other similar ideas like flechette loadings) exist/existed. However I'm talking about GP-25 compatible rounds being developed and used for anti-drone. While NATO style 40mm has had a lot of experimentation in the past, the 40mm for GP launchers didn't have as much experimentation in the past.