I do not know the limits of these systems... and of course they would be exceedingly expensive for your average sport shooter.
AFAIU, Russia doesn't have any munitions comparable to these guided artillery shells or even the guided HIMARS rockets. Arguably these deployments in Ukraine may inch Russia a little closer to resorting to tactical nukes. Their military doctrine relies on tactical nukes as an answer to conventional weapons beyond their own capability, and that's part of the reason Russia has so many tactical nukes deployed (at least at sea).
The DOD straight up announced that a recent military aid package included 1000 M982 Excalibur rounds. Another thing the US has been providing is M1156 PGK. It's a kit used to make unguided rounds more precise by adding GPS guidance and it dramatically reduces long range CEP.
Anecdotally I have noticed a large increase the frequency single shot artillery strikes on Russian tanks appearing in Telegram videos. Previously it would take a few shots to adjust fire. Now it's often boom! tank gone with no previous impacts evident.
What, Russias nuclear doctrine is to use nukes against the threatening of their own sovereignty and borders, not against conventional weapons that are better than theres.
What kind of pathetic military has a nuclear doctrine to drop nukes because the other country has modern technology?.
It doesn't matter anyway because Russias nukes are just for sabre rattling, Russia knows full well the any use of nuclear weapons, tactical or not in Ukraine will bring an overwhelming response that will likely just straight up end the war in Ukraines favour.
I don't believe their doctrine makes a distinction, because the rest of the world would not make a huge distinction.
Im happy to be wrong thought if you could link a primary source.
They have been doing it since the start of the war and do it about every single large shipment of weapons to Ukraine.
I suspect its mostly for a internal audience but also to make the west scared to send weapons which clearly hasn't worked.
Putin should remember that US doctrine explicitly approves massive nuclear first strikes when a situation appears to be escalating to nuclear conflict. Plus the US actually has thousands of mission-ready nukes and only two cities to hit.
Strongly disagree about tactical nuclear weapons; I consider it extremely unlikely that these will be ever used by anyone- way to much escalation for very little gain.
But, 120 mm is a lot bigger than anything I'd be comfortable firing from a rifle.