(Feel free to move this is its in the wrong place)
Damage to steel from frangible? This is commercially built, not something from Uncle Elmer’s machine shop. We’ve have had it for several years.
Can’t recall having seen anything like this when we shot .40SW. We switched to 9mm in mid-2014. This type of damage has only appeared within the last few months.
Those who might shoot rifles with frangible rounds in there deny that they are doing it.
We just completed a yearly perishable skills training cycle where the plate rack was used weekly, shot by most every deputy in the Office. (Yes, I know, there are people mashing the crap out of their triggers … we’re working on that)
The ammunition is Speer Lawman’s frangible round, 100gr, which we chronographed at 1300fps. That is 50fps faster than our old .40SW frangible loads.
If it isn’t visible in the pictures, we are getting cuts, dents in the steel that match the shape & depth of the projectiles. There is an edge hit that is a complete penetration of the steel. The dents are deep enough that you can feel and see them on the backside of the steel. Distance has been as short as 7 yards but 10 yards is common.
Thoughts on what is causing this? MP-5s with frangible?