spat
.700 Nitro Express
If the criminals were really preparing to repel cops you would have a ton of dead swat teams.You are not thinking like a criminal. They know its the cops. They are thinking about it daily perhaps by the minute. Then when "police" and "search warrant" is shouted many times by many people there is no doubt. Usually the people comply and there is nobody hurt. Sometimes they shoot and their girlfriend standing beside them gets shot. So be it.
All the high speed tactical gear in the world won't do shit if someone builds an IED under the porch your standing on when you kick that door in.