Skip to main content
Help Center Community Shop

Is G98/40 bolthead exchangeable w/ Mann Schoenaue

Kenneth Stuart
I have a MS 1950 257 Roberts with 0.010 inches excessive headspace. I can reload for it with slightly modified cases but I was wondering if the bolt head could be replaced with one that is readingly available like the G98/40?

Thank You
0

Comments

4 comments

Date Votes
  • Ambrose
    I do not believe that a bolt head for any other rifle will interchange with a Mannlicher Schoenauer--but I haven't tried it so that is just my opinion. As a suggestion, do you think it would work to make a .010" washer out of shim stock and insert it between the bolt body and head? That used to be a common fix for .22 bolt guns and centerfire rifles like the Winchester 43. When I have a rifle with excessive headspace, I do as you indicated and modify the cartridge cases to fit.
    0
  • Kenneth Stuart
    Ambrose thank you for replying. Are you the same person with the CZ 527 in 7.62X39mm who wanted some loading data?

    I have seen what you suggest done with a thin washer on a Ruger 77/22 Hornet to tighten up the two piece bolt and remove the sloppiness of fit.

    A while back, my gunsmith looked at my MS 1950 bolt and said there was only about 0.005 inches he could remove with a thin washer where the bolt body and head join. His other suggestion was to TIG weld - I believe that is what he said - a thin washer to the face of the bolt head.

    I have also thought about having a new bolt head CNC machined.

    Kenneth
    0
  • Ambrose
    Yeah, I'm the guy with the wild shooting CZ 527! I've moved on from that project but I'll get back to it eventually.

    Your GS idea about attaching a spacer to the bolt face has possibilities. A friend had a British Enfield that he was fond of but cartridge heads kept ripping off his reloads. Our Gunsmith (that guy deserved to have a capital letter on his title!) soldered a shim to the bolt face and eased that problem. I'm sure he just used plain soft solder. Since separate bolt heads don't turn against the cartridge head, there is no torque to contend with--only compression and it's doutful that shim/washer/spacer would be disturbed anytime soon. Super glue might even work!?!?

    Again, if it were me, I'd just modify the cartridge cases and not lose any sleep over it. I have two old Model 70 Winchesters in .300 H&H that develop head separations by the second reload. I neck new cases up to .32 caliber and then slowly neck them back down until I get a mild crush fit in the chamber; then go ahead and load. I only have to do this the first firing. After that I just partial size or neck size and those cases last as long as any others. I started that method on my own but not long ago I read an article in one of my gun magazines on tests a fellow did with the .338 magnum and he used the same method. The ammunition manufacturers don't seem to use much precision on the belt or shoulder of belted cases. The 7 Rem. Mag. is really bad in this regard. Of course, I keep (and mark the boxes) cases separate for each rifle I have; if you are going to use the same ammunition in several rifles, then you will have to use the extraordinary measures you're contemplating.
    0
  • Kenneth Stuart
    Ambrose

    I still have the Mini 30 and the customized Ruger 77 II stainless in 7.62X39mm which I hunt with.

    I know a rancher who had the same problem with his 300 H&H and he reloaded for it too. Told him how to make a wire feeler gauge and check his cases for potential head separation. But your idea would remedy the problem from the start.

    Kenneth
    0

Please sign in to leave a comment.

Recent Activity

Didn’t find what you’re looking for?