Id like for someone to do a cross review of all polys m and p and xd glock etc to compair them back to back shooting Id be very curious about the results. I like them all but Id like to see function and what they do on paper with the same ammo
You would think that shooting 4 different guns with the same ammo would be a good way to compare accuracy.
Does not work that way.
First each gun is unique. 4 identical guns with consecutive serial numbers can easily get the best accuracy with 4 different brands/bullet weights. As a gun owner, you have to try different loads to see what your gun prefers.
So, if you shot 4 different guns with the same ammo, you would only discover which gun liked that ammo the most. It would mean nothing about the gun you bought.
When testing, it takes a test of 10 identical guns before one can make a general statement like "The M&P does not do well with 147gn bullets". (I just made that up. I have not tested 10 identical M&P9s and have no idea if there is a general preference.)
If one was to test 4 different guns, each should be shot through a Ranson Rest with, say, 6 different brands/weights of bullets. Then you could see which gun, on average shot best. But even then, the results would have less validity about that model of gun in general. The test gun could be better or worse than most other examples of the same gun.
For example, I tested a single pistol with a variety of 9mm ammo (handholds). Same bullet and same primer and same powder. Only variable was powder charge.
It did well with 3.3 gr and terrible with 3.9 gr. You can see that if i only tested it with a single load, my opinion of the gun would be totally dependent on the luck of how much the gun liked that particular load.
Same thing happens with factory loads. A gun will do better with one and poorly with another.