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Joined: Jun 2006
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,337 Likes: 18 |
Personally, I don't like the COW method. I formed some cases for my 6.5-06 AI with COW just for the convenience of being able to fire the rounds in my garage. Got some case separations, not at the head but at the shoulder of the .25-06 brass I was using (not the new shoulder), all the way around the case.
The virgin brass had the slight crush fit it's supposed to have in an AI chamber and I had a gunsmith double-check the headspace, it was perfect.
Never had any case separations shooting fire-forming loads.
A wise man is frequently humbled.
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Joined: Jul 2001
Posts: 60,256 Likes: 38
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,256 Likes: 38 |
I had the same thing happen with some new .338 Winchester Magnum brass, when it was fired in a standard .338 WM chamber. Turned out that batch of brass was badly annealed.
Have never had anything like it happen with the COW method.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jun 2006
Posts: 46,337 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,337 Likes: 18 |
That could've been part of the problem, but once I saw those cases separate I unloaded the rest of the COW rounds and had no separations with the normal FF rounds. Same brass.
A wise man is frequently humbled.
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Joined: Jul 2001
Posts: 60,256 Likes: 38
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,256 Likes: 38 |
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jul 2001
Posts: 60,256 Likes: 38
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,256 Likes: 38 |
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jun 2006
Posts: 46,337 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,337 Likes: 18 |
A wise man is frequently humbled.
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Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
I guess you can run into all sorts of odd problems. I've never AI'd a standard case but belts work good. 7mm Mashburn Super from 300 Win Mag using COW. No problem.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Aug 2002
Posts: 19,134 Likes: 6
Campfire Ranger
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Campfire Ranger
Joined: Aug 2002
Posts: 19,134 Likes: 6 |
I'd neck them up to 35 caliber first, then size them back down just enough to create a false shoulder to headspace on. This is what I did with the .280 RCBS when making brass out of .270 Brass. Up to .308 and back down to .284 to just a snug fit. Worked great. I used a Lee expander in my universal decapping die, as Lee pins have a good taper to them. miles
Look out for number 1, don't step in number 2.
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Joined: Jun 2006
Posts: 46,337 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,337 Likes: 18 |
I guess you can run into all sorts of odd problems. It stunk up the garage too.
A wise man is frequently humbled.
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Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
LOL worst part!
Ill bet it did! I tried it in the basement at first....NOT a good idea!
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Jun 2006
Posts: 46,337 Likes: 18
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,337 Likes: 18 |
On the other hand, they worked like a charm to chase away those pesky trick-or-treaters last year. The muzzle blast can be seen a half a block away at night....
A wise man is frequently humbled.
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Joined: Sep 2008
Posts: 5,764 Likes: 2
Campfire Tracker
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OP
Campfire Tracker
Joined: Sep 2008
Posts: 5,764 Likes: 2 |
An update on the 338-378Wby project,
I don't have the rifle in hand and I was running out of time so I gave up the dream of setting a false shoulder with a .358 expander to control where the case would expand with a COW load.
I had to resort to "load and shoot as is" and see if they would form nicely. The brass is new 30-378 necked up to .338 and they all formed perfectly. The shoulder pushed forward ~.023" to fit the chamber with no signs of stretching or separating internally.
He's fired factory Wby. ammo in this rifle so I didn't expect any anomalies or pressure spikes with my loads and sure enough, velocities with my loads were within 10fps of loads listed by Barnes, Hodgdon and Nosler. That velocities were so close to those listed was a surprise. I have another 40 new cases to form so I'll do some COW loads as first planned just because I'm curious and want to compare. So far it seems that with new cases, in this rifle, I can load and be done.
Thanks for the thoughts, advice, and reasoning you all offered, I do appreciate it!
"Camping places fix themselves in your mind as if you had spent long periods of your life in them. You will remember a curve of your wagon track in the grass of the plain like the features of a friend." Isak Dinesen
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Joined: Jul 2001
Posts: 60,256 Likes: 38
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,256 Likes: 38 |
Thanks for the follow-up report.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: May 2014
Posts: 10,525 Likes: 16
Campfire Outfitter
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Campfire Outfitter
Joined: May 2014
Posts: 10,525 Likes: 16 |
A long time ago I used Cream of Wheat -early 1980's - 7 TCU cases out of military 223 cases. I've not tried it since. I've improved 270 cases by making them 280 cases. I've also made 350 Rem Mag cases out if 'standard' mag cases. And 7mm-08 cases out of 243 cases. 338 Win Mag out of 7mm Rem Mag cases. I've tried to make 22-250 cases out of 30-06 cases - just because. Plus I've made 256 win mag out of 357 cases. There's other I suppose, only the 7 TCU were required to be reformed. The others lots of cheap brass that I wanted to use in other chamberings. With belted and rimmed cases it was a snap. Others I used cast bullet loads and double shoulders AND pushing the bullet hard into rifling. It worked ok.
I prefer classic. Semper Fi I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally
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