K98k Stock Fit

[cipherk98]

My grandfather sporterized his K98 Pattern Mauser long ago (actually a G29/40... I messed up the thread title). I got a Yugo captured K98k stock for it last year to fix this but have been constantly battling fitment issues to where I am ready to just try another stock.

The problem is the gun rocks back and forth on the recoil lug. So when I shim up the rear tang, it takes nearly 1mm of shims for it to stop, leaving the rear of the receiver raised up quite far.



It's hard to tell but the little "tip" on the end of the bolt release is almost totally out of the stock. Can I shoot like this? Are there adjustments I can make to the stock or recoil lug to lower the front of the receiver in the stock? Getting proper fit at the front band is tough as well though I think I have enough room to where the end isn't touching the bayonet lug or the band, we'll see of POI shifts like crazy this time when it gets hot.

I'd like to get some sort of decent baseline on accuracy so I can figure out where the gun is at; in the sporter stock it shot okay at 50 but opened at 100. In this stock, in my various tries, it shoots good at 50 but strings badly as it heats up and is a lost cause at 100 yards, hot or cold. I suspect it needs to be counter bored as the rifling is really worn at the muzzle but it's obvious this stock isn't fitting well so I need to square that away first.

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[WarPig1976]

Did you remove material from the recoil lug yet??

[mrclark303]

You will also no doubt find the recoil uncomfortable with the action riding high in the stock. My 1903A4 build had really unpleasant recoil characteristics until it correctly bedded.

Stick with it, its all part of the fun

[browningautorifle]

I'm not sure what exactly you're trying to do, you have a rifle that the bore is less than stellar, so it's hardly target grade. The bedding is poor so you need to overcome that...perhaps you can set it down in the wood with a bit of careful wood removal but it'll likely never be as accurate as something in better condition is right now... Sounds like the bore is poor so you have an issue that won't be fixed even with counterbore.

[cipherk98]

I've left the recoil lug alone, and haven't touched the wood there either. My goal is about 4MOA accuracy... keeps me in the black on the targets we use at our local milsurp shoots and adequate for plinking. As far as bore condition it is rough; the lands look okay but the grooves are pitted. Not the worst I've seen but not the best. Slugs to .323 as it should so nothing weird there, it's just the rifling on the first 1/2" or so of the crown is not terribly sharp and the crown itself looks worn. When I get home tomorrow I can do a bullet test as a rough guide against one of my good Mausers.

So where should I be shaving wood down to try and lower it on the front, and should I be touching the lug itself?

[browningautorifle]

Find where it's high. It could be anywhere but you should be able to see it easily. Remove what's offending, careful...

Yes, your crown could be at fault. Freshening it up is an option...

[WarPig1976]

This^^^^
You can use lip stick on the metal in place of the fancy stuff to show you where the contact points are. You'll never do it right without a visual guide.

[cipherk98]

I put some effort into it yesterday and while I've not hit the range, I've managed to get it fit a lot better than it was. The main point of contact was where the bottom of the action touched the wood in front of the recoil lug - this area was much too high, to where the lug and much of the front of the action was not even touching the wood. Through a lot of very careful work I now got the action to where it is only rocking very slightly, is sitting better in the stock, and with a .01" shim is not rocking at all and seems to be fitting in far better. Muzzle passes the "sheet of paper test" at the bayonet lug. We'll see I guess.

Muzzle is worn though, a bullet is going in a decent amount deeper than my FN Mauser... not swallowing it but worn. At this point I just want to see where I can get it with the stock.

[browningautorifle]

That's the idea. Don't stop until it's done though, no point doing part of it and quitting. The crown needs to be done correctly or it won't shoot a barndoor for you and you won't understand..."I did all that"...

[mrclark303]

Good stuff so far, as Jim said sort the crowning next, once you have the bedding and crown done you might be very pleasantly surprised at the range, sometimes what appear to be shot out bores can shoot really well.