Certainly ShootingTheBull thinks it is, at least for 3 in. barrels. I think his testing in ballistic gel with and without heavy denim is as reliable or better than anyone else is doing.
https://www.youtube.com/watch?v=-wFNX_61EyY&feature=em-subscription-upload
https://www.youtube.com/watch?v=-wFNX_61EyY&feature=em-subscription-upload