6x45, custom bbl, sammi chamber, no carbon ring, savage action, 27.0 grns h335, 60*F, fiocchi brass, 65 Vmax jumped 0.015", measured 3211 fps, CCI SRP:
THAT was a close one...
- Thread starter chop house
- Start date
I’ve found H335 a bit touchy. Go over max and sometimes pressures go up quickly. That’s one reason I don’t use it...
jepp2
Gold $$ Contributor
You do realize the the CCI 400 is a thin primer and a less than suggested choice for a higher pressure cartridge?
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/Tula Small Rifle SR #KVB-223 - soft, sensitive copper cup, not recommended for AR15/military rifle use or high pressure rounds.
Yep, H414 also.
yup. i have solved many cratering instances on these 'savages' by using br-4's. just happened i had a small handful of fiocchi brass already primed and was running a quick velocity check knowing that brass was slightly smaller capacity than the fc scamp brass i normally use. so i wasn't oblivious, but it came on quick, as rifle woman noted.
25.5 2994
25.8 3025
26.1 3100
26.4 3122
...
27.0 3211
Time to call Ben (grimstod on here). Bush the bolt. Might not be over pressure.
Dusty Stevens
Shiner
A call to carlsbad is in order
Does anyone know where S&B SRP fit into this list? I had a similar issue in 223 with 62gr FBHP, AR-Comp, PMC 1x brass, using Nosler Load data. My primers had just a "hint" of cratering, some you see the slight ridge in the right sunlight, but not feel it with a fingernail. Others you could just barely catch a fingernail on the crater ridge. Primers were not flatten or distorted (still had rounded edges in the pockets). One range buddy stated pressure issues while another said all was good. LOL
That is the highest raised primer that I have ever seen
Somewhere in the last year Ive read that H335 was the powder ost often associated with apparent over pressure situations.In the 223/556 family of cartridges. It did NOT say the powder was the source of the problem, but left the reader to draw their own conclusions. Powder v. equipment v. operator error v. environmental factors.
Sphericals are my second choice over extruded.
Sphericals are my second choice over extruded.
AckleymanII
Gold $$ Contributor
NOT an over pressure load, thin cup primer and over size firing pin issue.
Spericals may give 2x the barrel life over extruded, perhaps more on dog towns.
Spericals may give 2x the barrel life over extruded, perhaps more on dog towns.
jepp2
Gold $$ Contributor
Agree 100%. Covered nicely in the video by Greg.
I'll share a picture of what the primers looked like coming out of my Rem 700 204 Ruger. Some would say "cratered". But in fact this rifle left the factory with a chamfer on the inside of the firing pin hole in the bolt face. This allowed a CCI BR4 to flow during firing to give the illusion of high pressure.
No, not close. . . as in the FP hole in the bolt face is not close(ly) fit to the firing pin.
If pressure was high, the corner radius would be squaring off.
I've run several thousand in .223, and they seem approximately equal to CCI in terms of pressure tolerance. They also seat much more consistently (force to seat) than either CCI or Win.
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I’ve got a 260 Improved that does that with most any powder and primer with small primer pockets, with large primer brass I many times see a slight thin burr where I get a bit of flow between the pin and bolt face hole, same exact load, just small vs. large primers. When I have my 22 Br barrel on the action I don’t get that???? Hmm?
Get your bolt bushed. No big deal.
D-4297
Gold $$ Contributor
Went through the exact same issue with my open rifle , and S&B , SRP's . Wasn't the load , or the primer , as others have said here . Sent the bolt to Grimstod , and he fixed me right up . Re-bushed it , and turned the F/P down at my request .
BTW ; If anybody has a bunch of those S&B SRP's layin around they want to get rid of for a reasonable price , send me a PM .
BTW ; If anybody has a bunch of those S&B SRP's layin around they want to get rid of for a reasonable price , send me a PM .
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