Well, tnx for replies,
My general way in charging a small enemy unit (RPG or sniper) is:
a stryker with 12.7 stops at 30 meters (the closer distance is dangerous because of enemy hand grenades through the windows) and begins shooting the main door. After that it pops a smoke to make the squad safe to disembark and charge.
A distance of 50m is dangerous because of possible flanking MG fire; then, the stryker cannot cover my entry team with smoke at this range.
Hmm, its under my skin, that the general army tactics in clearing the barricaded room (with no civies) begins with a throw of grenade why the covering team does not provide MG fire at front wall, and why the entry team does not throw a grenade..?
OK, thanx a lot, i'll try to clear this issue with different ways and post the results