we would use that stuff except for two reasons:
We would have to wear goggles due to the safety risk, not to mention our insurance provider would freek if we didn't. only motorcycle, tankers, pilots, and a few other speciazed personel ever wore goggle in combat durring ww2 so it would not be authentic for us.
and 2, there is no better feeling than to pick up the real thing. to know that you are using something that has a history (ALL of our german and most of our american weapons were USED in ww2). plus you cant really get the same effect of reloads and such when you use pellets. not to mention the SMELL of burning cordite and powder *wonderous sigh*.
There are a few more reasons but I will leave you with the two most major reasons...
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"Victory at any Price!"
SS-Panzergrenadier