With 3 PTRS they will do 30 damage on deflection.
No panzershcek does not do 10 damage on deflection.
If you are still in doubt try it cheat mod...
serealia:
1xPTRS
Damage 14
Penetration near 100
Penetration mid 85
Penetration far 70
Deflection damage 3.5
1xSCHRECK
Damage 40
Penetration near 180
Penetration mid 170
Penetration far 160
Deflection damage 10