Thanks for reply Zee and Chucky
The AT rifles I refer to were known as PTRD and PTRS (very long barelled).
I have an Osprey publication 'Kursk 1943' which describes the battle in stages very well. The rifles are mentioned as being responsible for destroying many 'German Panzers' but thats about as much really as is mentioned. I haven't read many German accounts that credit this weapon with great 'killing power'. Probably haven't read the right accounts yet!
The most attrition (apart from Ground forces!) came from the air strikes both sides inflicted with Sturmoviks and Henschel, Stuka and FW190s.
Thanks again for replies
ATB Mort