You're seriously underestimating the BRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT. 

One bullet leaves the barrel with 150,000 Joules of energy. A 250-pound person tackling you at 20 mph has about 4,500 Joules. 

One does not simply ignore the BRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT.