#1878066 - 12/18/07 08:23 AM
Loose primer pockets
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Cowboybart
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Registered: 02/13/05
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I have heard for benchrester's "staking in" primers in loose pockets. Can any body elaborate on this?? I am getting 1 to 2 reloads with Norma and Lapua brass before the primer pockets are too loose. I am using "starting loads" for SAMMI minimum spec chambers in 300 Wby and 6/284, with no signs of high pressure.
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#1878309 - 12/18/07 09:59 AM
Re: Loose primer pockets
[Re: Cowboybart]
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tightloop
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Registered: 11/15/06
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Have you chrono'ed the loads? Got to be something with your loads, IMO...don't think the brass is out of spec...just a thought.
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#1879373 - 12/18/07 04:54 PM
Re: Loose primer pockets
[Re: tightloop]
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Cowboybart
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Lent the chrono to a friend. May be 2-3 months yet before I get it back.
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#1879405 - 12/18/07 05:04 PM
Re: Loose primer pockets
[Re: Cowboybart]
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Spotshooter
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What kind of primers are you using?
Those types of brass normally don't see expansion like Federal brass does.
Spot
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#1880145 - 12/18/07 11:49 PM
Re: Loose primer pockets
[Re: whelennut]
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378Canuck
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Registered: 11/06/06
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Change your primers, probably a bad batch or QC not to snuff.
My guess.
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#1880248 - 12/19/07 04:23 AM
Re: Loose primer pockets
[Re: 378Canuck]
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tomk
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Yep, has worked for me--switch the primers...right after you chrono the load.
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#1882609 - 12/20/07 03:31 AM
Re: Loose primer pockets
[Re: whelennut]
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Cowboybart
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I'll try a different brand of primer. It may be a while 'til I get back to this as it has slipped on my priority list.
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#1896438 - 12/26/07 09:51 PM
Re: Loose primer pockets
[Re: Cowboybart]
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FC363
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Registered: 04/19/07
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Winchester primers tend to run smallish in OD so they might be a little loose. Bye the way, loose primer pockets ARE a sign of high pressure. If your chambers are cut to minimum spec with short throats the pressure will be higher than a normal hunting rifle. Especially the Weatherby!
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#1896461 - 12/26/07 10:09 PM
Re: Loose primer pockets
[Re: FC363]
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378Canuck
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I know Weatherby ammo is loaded to the balls but then on the other hand their Mark V action has been tested repeatedely to 200,000 cup without failure.
I don't know if other actions will hold together!!
Do you have a Weatherby FC363? I have 3 of them and I've been reloading for over 30years and I haven't had any problems.
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#1900638 - 12/28/07 11:45 PM
Re: Loose primer pockets
[Re: 378Canuck]
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FC363
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No I dont have a Weatherby. It was posted that his chambers were cut to a minimum spec, which by itself shouldnt raise pressures alot, but if the throat is short so that it doesnt have the typical factory freebore, factory rounds or loads duplicating them will be hot. Just as a comparison one of my rifles shoots one of its favorite bullets with .120 jump. If I seat that bullet to the lands with the same charge that brass will be junk. Didnt mean it as a slam on Weatherbys, just that loose primer pockets are a good indicator that your over max.
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#1942612 - 01/14/08 08:23 PM
Re: Loose primer pockets
[Re: Cowboybart]
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IndyCA35
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I have found that the plated (look silver colored) primers are actually a little wider than the brass ones and better for this condition. I can get more reloads out of .223 cases with them.
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#1945383 - 01/16/08 07:42 AM
Re: Loose primer pockets
[Re: IndyCA35]
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greydog
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As mentioned, loose primer pockets are a sign of excessive pressures. Mike the solid head of the cases before and after firing. If there is any significant expansion, the load is too hot. This is best done with once fired brass. There is always a certain amount of distortion on the first firing. Neck size only to do this.
Norma brass is typically a little soft but I've not noticed this with Lapua. At least not in the cartridges I am shooting it in (6BR, 6.5x55, 308, 30/06). I still believe, if you want to hot rod, you want to use Winchester brass.
As for primers; I have a bunch of Remington 9 1/2's which are about .001 smaller than everything else. The only brass I have that fits them is some old CIL 30/30 brass. At the rate at which I shoot this 30/30, my 800 primers will last several lifetimes! GD
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#2145052 - 04/12/08 02:54 AM
Re: Loose primer pockets
[Re: Cowboybart]
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LRF
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Registered: 01/16/05
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Cowboybart, what is a typical load for your 6.5/284?
I shoot 1000yd BR and use the 6.5/284. Primer pockets getting loose is a hassle. I have found Lapau brass to do better then Norma. 3 loads in Norma and the primers will fall out. I can get 4 or 5 in Lapau. When loose I throw the brass away. Last year I went thru ~650 Norma cases. This year I'm back with Lapau.
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#2146588 - 04/13/08 06:31 AM
Re: Loose primer pockets
[Re: LRF]
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rost495
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Registered: 01/05/05
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I recall a competitor that loaded stupidly...
Took an rcbs swage setup. Ball end milled the larger swage so it was concave, and would prime brass, and then run that up to press the edges of the pockets around the primer, much like a military crimp. He was using 223, so I'm not sure what you'd have to mill to make it work with LR...
That being said expanding pockets, if thats what you are actually doing, is either bad brass or a load a lot warmer than you think, IMHO.
Jeff
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#2148035 - 04/14/08 05:14 AM
Re: Loose primer pockets
[Re: Cowboybart]
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leftycarbon
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If your opening up pockets on Lapua brass you have LOTS of pressure or your min chamber is not min.
You can stake them though, F.E.Hart makes a tool that will tighten them up.
LC
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#2149553 - 04/14/08 08:40 PM
Re: Loose primer pockets
[Re: 378Canuck]
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Blaine
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I know Weatherby ammo is loaded to the balls but then on the other hand their Mark V action has been tested repeatedely to 200,000 cup without failure.
I don't know if other actions will hold together!!
Do you have a Weatherby FC363? I have 3 of them and I've been reloading for over 30years and I haven't had any problems.
While it is a fine action, the Wby action isn't the end all in strength. A Remmy 700 is stronger, and the Arisaka (forged) is stronger yet. I would expect there are custom actions stronger still. The Python I had was extremely stout.
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