...Soviet artillery is almost all doctrinal anyway.
?
Mortar
Zis barrage
(both of which come out at T1 time for Ost)
Su76
Kats
(Come out at T2-T3)
and then you get to doctrinal arty (of which there is an amazing amount).
If anything soviets have plenty of on map non-doctrinal artillery. Even more than Wehr did.
I have never managed to keep one of these crewed long enough to have it engage a tank. Once I had one kill an SU85. Don't forget if IS2 or 152 fire even one shot at it sometimes it causes full squad wipe.