Your case will fireform when the big light comes in and ignites the powder. Check all cases that have been formed to see that they all offer some resistance when closing the bolt. You do not want to push the new shoulder back after all that work in the F&T die.
#1891 ARGENTINE MAUSER CASE SIZE FULL#
Chamfer the case and run them through your regular Full length sizing die after loosening the set screw and backing off the die from the shell holder. 310 reamer through the case neck as you are forming the shorted case from where the thicker brass is in the shoulder area. Make sure to clean the die after each case is trimmed. I use a small file to trim the cases while in the F&T die. Eventually you will reach a point where the bolt will close with some resistance. This will tale a little time so don't rush things. We're talking about maybe 1/4 turn at a time when screwing down the die. If the case still doesn't not allow screw the die down a little more. I use Imperial case lube a little dab will do. Now if the first case will not fit without closing the bolt, try the case again but screw down the F&T die a little more. The case sits right on the face of the bolt. This means there is actually no headspace. What you are looking for is a slight crush fit or slight resistance when you chamber a case. Lube a case first and make sure the F&T die is not screwed down on the shell holder. I have a RCBS form & trim die that I used to make cases out of some surplus 8mm Israeli cases. I have 75 rounds of Argentine made hunting ammo marked 7.65x54mm and they will not fit in any of my 1891's chambers. Do not even try going to 54mm as they most likely will not fit in your 1891 chamber. Like Seabee noted (above) 8x57mm can also be used to form 7.65 mm cases. I'd use something less than a full power load to do the fire forming. 308, although I do believe that it would work as they would fire form to fit the chamber. I'd revisit the '06 conversion before trying the. You can probably adjust the shoulder by carefully screwing the die in farther until you hit the right spot. This one of the simpler cartridge case conversions, and I don't see why your Lee die wouldn't work. Take the case out of the trim die and chamfer the neck with a chamfering tool inside and outside. I run the case into an RCBS Trim Die, rough cut off the excess neck with a hacksaw, then finish cutting them to the proper length using a mill file. My die is RCBS, but I really don't see why that should make a difference. Next lube them and run them into my 7.65mm full length sizing die. I do each individually, and when each is red I tip it over into the water using a short piece of welding rod (but anything else similar would work). My method is to stand them in a baking pan in water to just below their shoulders, then to hit them individually with a handheld propane torch until they're cherry red. The procedure you followed is a lot like the one I've used successfully for years, and I've converted many of these cases 06/7.65.įirst, it's important to anneal the cases. Hi, and welcome to the forum! I read your post about converting 30-06 to 7.65 mm with a great deal of interest.