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#3239499 - 03/25/20 08:12 PM Problem with new gun
Rookietjx2 Offline
Seasoned Member

Registered: 01/14/18
Posts: 133
Loc: IN
I have a problem with my new gun. DPMS gen 2 with a Dtech 6mm creedmoor barrel. Here's what the brass looks like...



Now before everyone starts saying over pressure, here's the exact same load with the gas shut off...



Anyone have any ideas?

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#3239500 - 03/25/20 08:16 PM Re: Problem with new gun [Re: Rookietjx2]
GLShooter Offline
PM Sponsor

Registered: 01/09/05
Posts: 5009
Loc: AZ
Bolt is probably opening to soon. When you shut it down you mimic a bolt gun. This is why I run adjustable blocks on 90% of what I shoot. I see this all the time as I tune.

Greg
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#3239501 - 03/25/20 08:18 PM Re: Problem with new gun [Re: Rookietjx2]
Rookietjx2 Offline
Seasoned Member

Registered: 01/14/18
Posts: 133
Loc: IN
I was running with the gas block turned on 1/2 turn from fully closed...

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#3239502 - 03/25/20 08:20 PM Re: Problem with new gun [Re: Rookietjx2]
GLShooter Offline
PM Sponsor

Registered: 01/09/05
Posts: 5009
Loc: AZ
That's a pretty small AO. You might cheat and add mass to the BCG if it were an AR15 but yours is already way heavy. A different burn rate powder may help.

Greg
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#3239504 - 03/25/20 08:24 PM Re: Problem with new gun [Re: Rookietjx2]
Rookietjx2 Offline
Seasoned Member

Registered: 01/14/18
Posts: 133
Loc: IN
I'm using cfe223. I have some h335 and varget. Would a heavier buffer help?

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#3239506 - 03/25/20 08:26 PM Re: Problem with new gun [Re: Rookietjx2]
Rookietjx2 Offline
Seasoned Member

Registered: 01/14/18
Posts: 133
Loc: IN
First pic with gas has a CCI 450 primer. Second pic without gas is CCI 41.

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#3239507 - 03/25/20 08:27 PM Re: Problem with new gun [Re: Rookietjx2]
GLShooter Offline
PM Sponsor

Registered: 01/09/05
Posts: 5009
Loc: AZ
It would be a good starting point after you explore same same primer loading.

Greg
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#3239509 - 03/25/20 08:34 PM Re: Problem with new gun [Re: Rookietjx2]
crapshoot Offline
Retired PM Staff

Registered: 03/22/02
Posts: 22129
Loc: Henderson,Nevada,USA
Different cup thicknesses could be your primer problem.

Edit:
Some interesting primer info i found on another site.


PRIMER CHART & REFERENCE GUIDE

Small Handgun Standard .017" cup thickness

CCI 500
Federal 100 - Has a soft cup - good to use if hammer strike is light.
Federal 100M - Match version of above
Magtech PR-SP
Magtech PR-SPC - Lead-free "Clean Range" primer for indoor ranges etc.
Remington 1 ½
RWS 4031
Winchester WSP
Wolf Small Pistol SP - brass cup

Small Handgun Magnum .017" cup thickness

CCI 550 See Note 1 at the bottom of page
Federal 200
Federal 200M - Match version of above
Magtech PR-SPM
Remington 5 ½
RWS 4047
Winchester WSPM
Wolf Small Pistol Magnum SPM - brass cup

Large Handgun Standard .020" cup thickness

CCI 300
Federal 150 - Has a thinner cup
Magtech PR-LP
Remington 2 ½
RWS 5337
Winchester WLP
Wolf Large Pistol LP - brass cup

Large Handgun Magnum .020" cup thickness

CCI 350
Federal 155
Wolf Large Pistol Magnum LPM - brass cup

Small Rifle Standard

CCI 400 -thin .020" cup, not recommended for AR15 use by CCI/Speer. Good for .22 Hornet, .30 Carbine. See Note 1 at the bottom of the page
CCI BR4 - match primer with a thicker .025" cup.
Federal 205 - Mil-Spec cup thickness according to Federal - okay for 5.56mm. .0225" cup thickness.
Federal 205M - same as the 205 but the match version.
Magtech PR-SR - .025" cup thickness (not much feedback yet on this new primer as to AR15 suitability but with the same cup thickness as the Rem 7 1/2 it looks good so far)
Remington 6 ½ - thin .020" cup, intended for older, lower pressure rounds Remington says do not use for the .223 Rem or other similar pressure rounds. Good for .22 Hornet, .30 Carbine.
Remington 7 ½ BR - A match or "bench rest" primer. Lyman & Nosler classify this primer as a Standard. Remington says the compound is the same as the 6 1/2 but with a thicker .025" cup.
RWS 4033
Winchester WSR - some piercing issues noted when changed from silver to brass cup. Cup thickness is a bit thinner at .021". Most say they are good to go for the AR15 despite that, probably because of the hardness of the cup. Some feel they are less resistant to higher pressures.
Wolf Small Rifle SR - soft, sensitive copper cup, not recommended for AR15/military rifle use or high pressure rounds.

Small Rifle Magnum

CCI 450 - same thicker .025" cup as the BR4 and #41.
CCI #41 - commercial version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. .025" thick cup. Same primer mix as CCI 450.
Remington 7 ½ BR - A match or "bench rest" primer. Hornady, Handloads.com, and Chuck Hawks classify this primer as a Magnum, differing from other sources that classify it as a Standard. .025" cup thickness.
Wolf Small Rifle Magnum SRM - hard, less sensitive brass cup intended for AR15/military rifle and high pressure rounds.
Wolf Small Rifle 223 SR223 - "This is the newest primer available in the Wolf line. It is ever so slightly hotter than the small rifle magnum primer and it comes with a brass colored thick cup. This primer can be used in place of the SRM primer or used when a different powder is used that is hard to ignite."

Large Rifle Standard

CCI 200 - mild in brisance. Hard enough for use in semi-automatics.
CCI BR2 - same as the 200 but the match version. Hard enough for use in semi-automatics.
Federal 210 - medium brisance between CCI/Remington & Winchester. Do not use in semi-automatics.
Federal 210M - match version of the above primer. Do not use in semi-automatics.
Magtech PR-LR
Remington 9 ½ - mild in brisance.
RWS 5341
Winchester WLR - the hottest standard primer. Hard enough for use in semi-automatics.
Wolf Large Rifle LR - all brass - Used by noted match shooter David Tubbs who says: "Be sure they are seated into the case - if not they can be hard to ignite. Russian primers use a different sinoxide compound (closer to the European type), which, in my testing, consistently delivers better extreme spreads over Federal..." Hard enough for use in semi-automatics.

Large Rifle Magnum

CCI 250
CCI #34 - commercial version of the fully-qualified DOD primer for use in U.S. military ammo.
Federal 215 - original magnum primer
Remington 9 ½ M - mildest magnum primer.
RWS 5333
Winchester WLRM
Wolf Large Rifle Magnum LRM - all brass

50 BMG

CCI #35 - commercial version of the fully-qualified DOD primer for use in U.S. military ammo.
Winchester 8312

Primers recommended for use in .223 Rem/5.56 semiautomatic rifle loads:

CCI #41, 450, BR4 (#41 & 450 good with ball powder)
Federal 205, 205M
Remington 7 1/2 BR (good with ball powder)
Winchester WSR (good with ball powder)
Wolf SRM (good with ball powder)
Wolf SR223 (hotter than SRM - great with ball powder)

Primers recommended for use in .308 Win/7.62x51/7.62x39 semiautomatic rifle loads:

CCI #34, 200, BR2, CCI 250
Winchester WLR, WLRM (good with ball powder)
Wolf LR

################################################## ################################

NOTE 1: According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably.


Edited by crapshoot (03/25/20 08:45 PM)
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I carry a gun because a cop is to heavy.

Average response time for a 911 call is 10 min.
Average response time for a .45acp is 900FPS.

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