Sorry for messing up with details, but I've just found a big article on Soviet tank guns 1945-1965 in Tekhnika i Vooruzhenie 9/2008 - quite professional, with detailed information on early postwar guns and their ammunition, including cross-sections of rounds.
According to it, 122mm D-25 gun of IS-2/ 3/ 4/ ISU-122/ T-10(early), used no HEAT rounds at all. It used only BR-471 AP and BR-471B APBC rounds - both penetrating 164-165mm@100m. There was no other AP ammo developed after the war for them either. I haven't found info on HEAT rounds for this gun (nor its field ancestor A-19) also in other sources, including Russian Wikipedia, which describes other ammunition types in detail
http://ru.wikipedia.org/wiki/122-%D0...28%D0%90-19%29
The first 122mm HEAT tank round mentioned in the article was BK9 developed for M-62T2 gun (T-10 tank) in 1964 (200mm against inclined armour). There is no information if it could be used with D-25 gun, but M-62 had bigger cases and its basic AP round was BR-472, not 471. By that time, D-25-armed tanks would be obsolete anyway. In 1969 also BM11 "sabot" ammo was developed.
BTW: the article also gives regulation ammo loads - IS-2, IS-3: 17 HE/11 AP, T-10: 15 HE/15 AP, T-10M: 15 HE, 9 HEAT, 6 sabot (there are also similar data for T-34, 44, 54, 55, 62).
It also appears, that 85mm ZiS S-53 gun of T-34/85 tank possibly didn't use HEAT rounds. There are mentioned only BR-365 (APBC, 119mm@100m), BR-365K (AP, 126mm@100m), BR-367 (APCBC), APCR BR-365P (167mm@100m), APCR BR-367P (with ballistic cap). "367" family was post-war - probably 1949, with no specifications given there, but according to page on D-44 gun
http://vadimvswar.narod.ru/ALL_OUT/T...O/SuPTO034.htm penetration of BR-367P was 210@500m (a penetration of BR-365P is given there 180@100m, but a difference might come from a bit longer barrel in D-44 - L/55 vs L/51).
Only in the Web I've found, that D-44 gun also used HEAT rounds BK-367 and later spinless BK-2. "367" suggest postwar round, while, according to some forum, BK-2 was accepted in 1969. It's strange, that they are never mentioned in connection with T-34/85, including in a quoted article... It was however possible to use them (though I don't know, if it could be accomplished without eg. modification of sights?...)
So, I think, that we should in the future remove HEAT from tanks with 122 mm D-25 - and at least from early postwar T-34/85 in countries, which use Heat for them. In later T-34s we could keep it - though D-48 gun in #606 T-34/85 in Russian OOB is definitely too strong - D-48 used different and not exchangeable ammunition.
Regards
Michal
Early HEAT for Soviet tanks...
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