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Joined: Feb 2010
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Campfire Ranger
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Campfire Ranger
Joined: Feb 2010
Posts: 17,763 |
I have run across some WW Roberts brass that will not fit my shellholder. Upon examination I found the diameter of the extractor groove to be larger than the brass that fits. This is pre +P brass FYI, was the groove diameter larger on early brass and later standardized? Anyone else encounter this situation?
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Joined: Dec 2002
Posts: 810
Campfire Regular
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Campfire Regular
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Posts: 810 |
Nope. All mine has had the same case head as 7mm Mauser, 30-06, 45ACP, etc.
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Joined: Feb 2010
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Campfire Ranger
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Campfire Ranger
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You failed to understand the question, I'm not talking about the case head diameter which is the same. What I am talking about is the diameter at the bottom of the extractor groove. the cases that will not fit my shellholder have a larger diameter here.
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Joined: Jul 2009
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Campfire Regular
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Campfire Regular
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One of my reloading books had a note that some brass had different extractor groove. I think maybe an old Lyman. All new brass is the same I think.
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Joined: Feb 2010
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Campfire Ranger
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Campfire Ranger
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You are correct, new brass whether +P or not all extractor groove diameters are the same. I have been roloading .257 Roberts for nearly 40 yrs. and this is the first I had encountered this. Needless to say I scrapped those few pieces of brass.
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Joined: Nov 2010
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2010
Posts: 37,018 |
It would be pretty easy to relieve the inside lip of the shell holder just enough to accommodate brass with the shallow extractor groove.
DF
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Joined: Mar 2004
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Campfire Regular
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Campfire Regular
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I had the same issue, and it must have been common at one time. An RCBS #11 shell holder solved the problem. Found that info in an old Speer manual. All my current 257 and 7x57 brass fits in the #3.
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Joined: Dec 2002
Posts: 810
Campfire Regular
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Campfire Regular
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The groove in 7mm Mauser S&B brass is larger than any other 7mm brass I've bought or been given. Privi Part. brass is standard with modern brass.
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Joined: Dec 2004
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Campfire Tracker
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Campfire Tracker
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I had the same issue, and it must have been common at one time. An RCBS #11 shell holder solved the problem. Found that info in an old Speer manual. All my current 257 and 7x57 brass fits in the #3.
+1 If I remember right, some of the old shell holder charts gave two different numbers for the 257
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Joined: Oct 2011
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Campfire Regular
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Campfire Regular
Joined: Oct 2011
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I had the same issue, and it must have been common at one time. An RCBS #11 shell holder solved the problem. Found that info in an old Speer manual. All my current 257 and 7x57 brass fits in the #3.
+1 If I remember right, some of the old shell holder charts gave two different numbers for the 257 I've found this too. Just don't mix brands of brass in the same run. I necked some 6mm Remington up to 257 when I couldn't find 257 Roberts brass. It takes a #11. I only use it for 75 grain Sierras so it's always separate. I've also found instances where a Lee holder didn't work with some 7.62 Nato, but an RCBS did. Just different manufacturers dimensions stacking up.
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