Is this brass 7x57mm Mauser????

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eagle7	Is this brass 7x57mm Mauser????	Lead	[-]
Posts: 3950 (06/11/09 11:31 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Tags : None I recently bought an assortment of unfired and once fired brass that was advertised as 7mm Mauser. As a precaution I inspected each case for defects and ran them through my 7mm Mauser case trimmer. Eleven of the cases wouldn't fit in the case holder although they appear to be dimensionally identical to the other cases. Upon closer inspection these cases appear to have a more narrow extraction groove than all the other 7mm cases. The headstamp on these cases is SUPER-X 7m/m. I can cycle these cases through my 1895 Chilean Mauser, the cases do slide up from the magazine well and under the exractor claw with no problem. I have a Lee Loader in 7x57 so I can load the cases without using a shell holder, but should I?? Any ideas on these cases, are they something other than 7mm Mauser, or is the difference in extractor grooves just a variation between manufacturers?
WVchuck		#1	[-]
Posts: 12099 (06/11/09 01:43 PM) Forum Site Moderator Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	I've got some European 6.5 Swede and 7.5 French that have a slightly larger than US specs base that don't want to fit in the RCBS assigned shell holders. IMO, compare them to unfired factory 7x57 brass and see if you can tell a difference visually, then check them against each other with calipers. What are the headstamps/manufacturers?
eli griggs		#2	[-]
Posts: 683 (06/11/09 01:51 PM) active member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Super-X marked brass should be Winchester. "Those who hammer their guns into plows will plow for those who do not." ~ Thomas Jefferson ~ "In the middle of difficulty lies opportunity". - Albert Einstein WANTED - Lee Loaders - 6.5 Swede Mauser, 7.5 Swiss, 7.62x39, 7.62x54r, .303 Brit WANTED- Turkey and Goose feathers for fletching arrows
Parashooter		#3	[-]
Posts: 1667 (06/11/09 03:40 PM) Veteran member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Yes, there have been variations in extractor groove dimensions in 7x57 ammo over the years. It's not a defect in the brass. Sometimes a different brand of shellholder will do the trick. Other times you have to go to the next larger shell holder - the one used for .30/30, 6.5x55, or 7.5 MAS or Swiss. If the inner beveled span of the shell holder is too tight for a shallow groove, a few seconds work with a fine cylindrical stone in a Dremel may be all that's needed. "Super-X" was a Western trademark. The Winchester brand used "Super-Speed". After 1931 they both belonged to Olin and there eventually wasn't much difference except the headstamp.
eli griggs		#4	[-]
Posts: 686 (06/11/09 03:50 PM) active member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Thanks for the clarification of the head-stamps, I don't think I've ever even see a Western loaded round. Is there anyway to ID the Western brass prior to 1931 without the original box? "Those who hammer their guns into plows will plow for those who do not." ~ Thomas Jefferson ~ "In the middle of difficulty lies opportunity". - Albert Einstein WANTED - Lee Loaders - 6.5 Swede Mauser, 7.5 Swiss, 7.62x39, 7.62x54r, .303 Brit WANTED- Turkey and Goose feathers for fletching arrows
Parashooter		#5	[-]
Posts: 1668 (06/11/09 06:32 PM) Veteran member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Western read "Super-X". Winchester was stamped "Super Speed". Finally somebody figured out they could save some money by stamping both "W-W SUPER" Military Western was WCC, Winchester WRA. Pre-war commercial I've seen was just "Western" or "W.R.A.Co.". I imagine there were other variations.
eli griggs		#6	[-]
Posts: 687 (06/12/09 08:00 PM) active member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Good stuff Parashooter, the pics are helpful too. I've seen the WWC head-stamps in some of my range pickup but to tell the truth, I thought it stood for Winchester Centerfire Cartridge or some such. Eli "Those who hammer their guns into plows will plow for those who do not." ~ Thomas Jefferson ~ "In the middle of difficulty lies opportunity". - Albert Einstein WANTED - Lee Loaders - 6.5 Swede Mauser, 7.5 Swiss, 7.62x39, 7.62x54r, .303 Brit WANTED- Turkey and Goose feathers for fletching arrows