I was measuring the max COAL on a few M&P's, using the plunk method, and was a bit surprised at the results of one of my barrels. I measured 5 different bullets in 4 barrels. I don't expect all to be identical but one barrel is not even close to the often published 1.169", with this or any bullet measured.
As I stated, I measured 5 different bullets but my examples below will be for the Zero Precision 125 Gr. JHP.
The longest measured COAL was from a Shield 9 with a max COAL of 1.173".
The shortest measured COAL was from a M&P9c with a max COAL of 1.097".
I understand these are not competition barrels or anything but .076" seems rather extreme to me. The next closest measured COAL was from another M&P9c with a max of 1.146".
I hope to make it to the range next weekend and will be testing various jump to see if it makes a difference in the longer COAL barrels. I'm hoping I can just load to the shortest barrel for everything and be good to go. I know in precision rifle .076" can make a huge difference so I'm curious to see if it does in pistol also, but hoping it does not. All are just for plinking, nothing over 7-10yds.
As I stated, I measured 5 different bullets but my examples below will be for the Zero Precision 125 Gr. JHP.
The longest measured COAL was from a Shield 9 with a max COAL of 1.173".
The shortest measured COAL was from a M&P9c with a max COAL of 1.097".
I understand these are not competition barrels or anything but .076" seems rather extreme to me. The next closest measured COAL was from another M&P9c with a max of 1.146".
I hope to make it to the range next weekend and will be testing various jump to see if it makes a difference in the longer COAL barrels. I'm hoping I can just load to the shortest barrel for everything and be good to go. I know in precision rifle .076" can make a huge difference so I'm curious to see if it does in pistol also, but hoping it does not. All are just for plinking, nothing over 7-10yds.