rhyrlik Posted October 8, 2013 Share Posted October 8, 2013 Hi: I built a 9mm 16" barrel AR a couple of weeks ago and been trying different loads. I noticed that with 4grs of Bullseye and 125 grain Zero JHP (#162) bullets it pierces primers. I found a vague reference that fast burning powders are a no no in long AR barrels. I don't understand the reason. My 4 gr load is nowhere near max. It has an OAL of 1.135". It uses WSP primers. It works in my pistols without any issues. Please explain this cuz the load shoots four times more accurate than factory WWB and I wanna keep using it. Thanks for any help. Link to comment Share on other sites More sharing options...
KellyTTE Posted October 8, 2013 Share Posted October 8, 2013 (edited) I use small rifle primers for my 9mm AR ammo. You could also have a bad/worn firing pin that's protruding too far. In order to diagnose this issue, this tool: http://www.brownells.com/gunsmith-tools-supplies/measuring-tools/firing-pin-protrusion-gauges/firing-pin-protrusion-gauge-prod26477.aspx is essential. (SLR AR armorer here) Galaxy Note II + Tapatalk 2 Edited October 8, 2013 by KellyTTE Link to comment Share on other sites More sharing options...
razorfish Posted October 8, 2013 Share Posted October 8, 2013 Powder Valley has Tula Small Rifle Primers with a harder cup especially designed for automatic rifles in stock. (TUL SMALL RIFLE PRIMERS (KVB223) (1000) @ $23.50 per Thousand) These should fix you right up. http://www.powdervalleyinc.com Link to comment Share on other sites More sharing options...
rstandley Posted October 9, 2013 Share Posted October 9, 2013 (edited) The rifle is designed to use ammo with small rifle primers. Small pistol primers can be used, but as you see, the pin hits it really hard. A shorter pin (-.010) or weaker hammer spring can be used, but then it would not fire rifle primers. I know you like Bullseye powder, however your rifle would work better on a slow pistol powder say Hodgon HS-6 at a max load or Power Pistol powder. The slow powder would love that long barrel. You could easly push a 125gr. JHP to 1600 fps. My 2 cents worth. Edited October 9, 2013 by rstandley Link to comment Share on other sites More sharing options...
rhyrlik Posted October 15, 2013 Author Share Posted October 15, 2013 I went out and shot it again today. I tried 231 powder with WSP primers and they pierced. I also tried FC-200 and CCI-500 primers with Bullseye and they did not pierce. I think the piercing issue is a combination of the heavy hammer blow and the pressure curve of the load. WSP does not pierce with slower burning powders like AA#7 or WSF, but these don't deliver the same accuracy as Bullseye or 231 in this rifle. Thanks for the feedback. Link to comment Share on other sites More sharing options...
Hunter413 Posted July 13, 2014 Share Posted July 13, 2014 Powder Valley has Tula Small Rifle Primers with a harder cup especially designed for automatic rifles in stock. (TUL SMALL RIFLE PRIMERS (KVB223) (1000) @ $23.50 per Thousand) These should fix you right up. http://www.powdervalleyinc.com I snagged 10k of these and have loved them Link to comment Share on other sites More sharing options...
rdinga Posted July 13, 2014 Share Posted July 13, 2014 Try some AA#7. Link to comment Share on other sites More sharing options...
thompsoncustom Posted July 14, 2014 Share Posted July 14, 2014 8.5gr of Power Pistol 1.169 OAL will give you about 1715fps with a 125gr bullet or atleast it does out of my 16in, there a little on the hot side tho so use at your own risk. Link to comment Share on other sites More sharing options...
truborshooter Posted July 14, 2014 Share Posted July 14, 2014 1715 X 125 is 214 pf 223 55gr x 3000 fps is 165 pf 62 x 3100 192 yeah the load is a little on the hot side Link to comment Share on other sites More sharing options...
thompsoncustom Posted July 14, 2014 Share Posted July 14, 2014 Ya I know But just incase you want to reach out and touch something with a 9mm. I'll go faster when I figure out how.... Link to comment Share on other sites More sharing options...
peterthefish Posted July 14, 2014 Share Posted July 14, 2014 1715 X 125 is 214 pf 223 55gr x 3000 fps is 165 pf 62 x 3100 192 yeah the load is a little on the hot side Apples & Oranges. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now