Throw it out.
Back when the shelves were bare I bought a 5 gallon bucket of fired 308 and 5.56 blanks. I opened up the crimps, knocked out the primers and fire formed the 5.56 into 6x45 and 25-45 Sharp's. The 308 blanks I fire formed to 30-06. If the neck split they became 8mm Mauser and if they split they became 308, 7mm08 or 260 Remington dependingon my need. It was a labor of love with much neck turning and hand fitting but I am still using them today. I would first expand the blank nose to .338 in steps. If they didn't split I then sized them through my 30-06 die to give a slight shoulder for head space. Then I would load with 10 grains of Red Dot and a 100 grain lead bullet that I happened to have plenty of. I could probably have saved more by annealing but since I needed the smaller calibers to I didn't mess with it the first time. When I reload these again I probably will. I probably converted between 600 and 800 blanks into usable ammunition. I even converted some into 458 socom and 45 acp but that was way to much work for so so results.
Could it be the 8mm-06? I heard that after ww1 or 2 that many soldiers brought back captured 8mm Mauser and wanted to hunt with them. But since they couldn't get 8mm ammo here they had them converted to take the 30-06 case. Which would not have been much of a conversion since the 8mm Mauser is the parent cartridge of the 7x57 mauser and the 30-06.Without measurements it’s impossible to say, there are a couple of 7.65 Mauser and 7.7 JAP cartridges around that length.
But it’s was made from a Twin Cities 30-06 case made in 1954.
7.65x53 Argentine from 30-06
I'm trying to find an accurate load for my 1944 Turkish Mauser. It is 8x57 and I put a scout scope on it. I've tried several powder and bullet combinations and so far have only found one combination that is MOA but it is a 200 grain Speer hot core only going 2100 fps. I'm not sure this is going fast enough to reliably expand on deer at 100 to 200 yards. I have a good number of 185 grain interlocks for it but so far 4 MOA is the best I've produced with it. GRT showes IMR 4895 to give 100% burn with good case fill and velocity is 2600 but accuracy is not there. Does anyone have a pet load for this caliber? The powder I have on hand is H 4350, H380, Superformance, BL-C (2), CFE223, IMR 4895, and Ramshot Tac. Also Accurate 2230, 2460 and 2520 as well as a little RL15 but I understand it is gard to get now. Any help would be appreciated, thanks.
Case is too short to be a 8mm-06 and likely the wrong bullet diameter.
The early 8x57 Mauser was a smaller bullet, .313 I think.
Prior to 1995 it was 7.92x57 irs which was .311 to .313 depending on the rifle. Tolerance wasn't as tight back then. Bullets for it were typically. 313. 1903 to 1995 Germany adopted the 7.92x 57 is which in English was miss represented as 7.92x57js. Today we just call it 8mm Mauser.
Prior to 1995 it was 7.92x57 irs which was .311 to .313 depending on the rifle. Tolerance wasn't as tight back then. Bullets for it were typically. 313. 1903 to 1995 Germany adopted the 7.92x 57 is which in English was miss represented as 7.92x57js. Today we just call it 8mm Mauser.
Back in the days of youth when those 8x57 Mauser rifles were selling for cheap {$30-40} the common conversion was to 8x30-06 as the gunsmiths just ran the 30-06 reamer in and that cleaned up the chamber as the 30-06 is 63 millimetres long. For about $30 then…
