07-08-2018, 03:11 AM
I purchased two ammo cans of the American Gunner the other day and shot it in my new 12.7 Faxon group buy pistol as part of the break in procedure and noticed some signs of over pressure. There is a pretty good indention in the base of the case from the ejector hole. I purchased a chronograph and tested it today with one shot and it showed 2922 FPS and it left another good size indention in the case.
I also decided to test the 123 SST and it showed 2571 fps with no signs of over pressure. This doesn't make much sense to me, these kind of numbers from the 12.7.
The pic is a case from the AG and one from the SST. Please take a look and let me know it is a concern or not.
SST COAL is 2.241 with 1.668 ogive
AG COAL is also 2.241 with a 1.69 ogive
Not sure exactly what is going on but wasn't expecting this kind of velocity out of the 12.7.
I have an Odin Works 18" I can test the AG in but I believe the chamber is shorter than the 12.7 and I am worried it will also show signs of over pressure.
All I have ever shot out of my grendels has been SST, Black and some wolf. I have also recently purchased 5 boxes of AA 123 Lapua Scenar (1.71 ogive) from a friend and now I am worried these two will also show signs of over pressure. I have a lot of money tied up in ammo that may not work in my grendels.
I guess I need to measure my chambers to see if they could be short.
I also decided to test the 123 SST and it showed 2571 fps with no signs of over pressure. This doesn't make much sense to me, these kind of numbers from the 12.7.
The pic is a case from the AG and one from the SST. Please take a look and let me know it is a concern or not.
SST COAL is 2.241 with 1.668 ogive
AG COAL is also 2.241 with a 1.69 ogive
Not sure exactly what is going on but wasn't expecting this kind of velocity out of the 12.7.
I have an Odin Works 18" I can test the AG in but I believe the chamber is shorter than the 12.7 and I am worried it will also show signs of over pressure.
All I have ever shot out of my grendels has been SST, Black and some wolf. I have also recently purchased 5 boxes of AA 123 Lapua Scenar (1.71 ogive) from a friend and now I am worried these two will also show signs of over pressure. I have a lot of money tied up in ammo that may not work in my grendels.
I guess I need to measure my chambers to see if they could be short.