In fact HIMARs with GMLRS is barely matching in range the quite widespread Smerch used by both Russian and Ukrainian forces. The Russian Smerch is also guided, but surpasses HIMARs in firepower.
http://www.army-guide.com/eng/product1374.html
>”Smerch” salvo accuracy is no more than 0.21% of rockets flying range.
That’s 190 meters for the reported range of 90km.