Ok we are move right along. we got 9mm 124gr NATO is +p and we got you to agree that bullets do bounce off windshields. Now the last one.
FBI switched to .40 from 10mm for a lot of other reasons than that, as well...capacity being first and foremost (followed by a much less expensive platform (G23 vs S&W 1076). Windshield performance was well down the list of reasons.
First .40 and 10mm hold the same mag capacity, as a .40 cal is a shorter than a 10mm but fires the same size .40 and weight bullet 180gr. The FBI shoot out with the two bank robbers happen 2 block from my house in Pinecrest. Which started the bullet testing. At first they jump on to the 10mm, but found out that the women agents was having a hard time with recoil and following up on double tap. Glock tried to jump on the band wagon with G20 but doing work out. Years later with all test on the new 9mm projectiles. They switch back to 9mm and in all there test found the Speer 9mm G2 best for there needs. google it
So back to the subject my vote goes to the Seers G2 9mm