What I see as valuable in newsprint testing is to determine for yourself if the bullet performs as the manufacturer describes. There will always be those claiming the exception rather than pointing out the rule, but, if you test enough bullets from a variety of calibers at varying velocities you do get an idea if the bullet is performing in accordance with its design and marketing. And, of course, the medium has to be consistent. The best cup and core bullet is likely to disintegrate if the newsprint is too dry, but even then, if the medium is consistent, you can determine which penetrated more before shattering. I've drawn my own conclusions, of course, from my own testing but I'm hesitate to mention them due to the flammability of the electronic media.