I would like to measure the relief cut between the C-Ring and the first thead in some 98 actions. What measuring device is available to do this and where can I get one? If I could borrow or rent one, that would be even better.
Thanks,
Matt

I just have to ask why it is important. Use a piece of clay or putty and then let it harden, remove it and measure that. That is how we measure pits in tank cannon barrels.

I would like to take an 09' to small ring. Many 98Kar actions proved week because this relief cut was to deep. The Polish got it right with their version, as the relief cuts are shallower. I have a Warsawa small ring action on hand to use as a reference. Thanks for the advice. I may try the putty idea. I would love to know what measuring device I could use to make it easier though.
Thanks,
Matt

Matt
Take the money that you'll spend on this bad idea and just find a G33/40. You'll be way ahead.
D

quote:

Originally posted by DArcy_Echols_Co:
Matt
Take the money that you'll spend on this bad idea and just find a G33/40. You'll be way ahead.
D

Can't really argue with the likes of you. I was inspired to try this by seeing Joel Dorleac's light weight rifles built on small rings made from 1909s. I then read every post that Tom Burgess made on A.r., and found the following thread regarding small ring large thread actions:

http://forums.accuratereloadin...?r=17510394#17510394

My plan would be a standard pressure 6.5x55 in the style of a light weight pre-war guild gun I just sold (It was an 8mm-06). Open sights only. The action would go to PAC-met, and no high pressure loads. I have a 1909 with a deeply gouge out crest. If the chip relief cut is not to deep, I would like to make it work. Here a link to Dorleac's light rifle:


http://www.dorleac-dorleac.com...line/legere/?lang=en

Just because Dorleac does it, doesn't make it safe. Burgess' stamp of approval may not either. I guess I'm dumb enough to be attracted to dumb idea's. That and I have a nice 1909 with a deeply gouged front ring laying around and serving no purpose.
Matt

My understanding of the problem with SR '98's was that the SR receivers threaded for LR barrels had too little metal in the ring. The partial remedy was to thread the SR '98 receiver for a SR barrel and retain the proper thickness for strength as in the Pol version. You could get a Turk M38 receiver and have the front ring turned down (by a cert. firearm mfg.) to SR diameter to reproduce the dimension. But it sounds like you are trying to make a hybrid receiver diameter between a SR and a LR out of 1909 LR. With a low pressure round like a 6.5x55 that might be OK.

You could also just buy a Brno 21 or 22 as a complete rifle and in great condition and still be money ahead.

And you'd be shooting it a lot sooner

Browning made a small ring Mauser with a large thread. I didn't like it either. If I'm going to have a small ring action, I'd prefer a 1" thread.
I have made small rings from a couple of turks but they have a small thread.
How much weight do you figure you will lose by taking a layer .032" thick off 3/4 of the circumference of a Mauser receiver ring? Regards, Bill.

quote:

How much weight do you figure you will lose by taking a layer .032" thick off 3/4 of the circumference of a Mauser receiver ring?

Sure not enough for me to fool with. Will be curious to hear/see what the outcome is.

Ok, I see what you want to do; I gave you the easiest way; you use a standard mic or caliper to measure the casting. You would need a bore mic to do it directly and the pads would need to be small enough to fit into the recess.
It's not the weight; it is the coolness factor of a small ring receiver. Of course, a small thread, small ring is better but I am not afraid of conversions for standard pressures.

quote:

it is the coolness factor of a small ring receiver

That I will buy in on.

Oh yeah! Nothing is more "sexy" than a SR receiver mated to a sexy barrel. The LR receiver looks like a layer of steel was just scabbed-on. Oh, it was wasn't it?

quote:

Originally posted by ramrod340:

quote:

it is the coolness factor of a small ring receiver

That I will buy in on.

I've measured several with a 0-1 Starrett micrometer with a changeable anvil. IIRC it is a model 220. I did have to make an anvil to reach inside but, it worked very well. I modified a 38 Turkish receiver to a G33-40 profile. The thread relief is deeper on the Turk than a G33-40 receiver I have so, I will use it for a lower pressure cartridge.
Mark Poley

quote:

Originally posted by Mark Poley:
I've measured several with a 0-1 Starrett micrometer with a changeable anvil. IIRC it is a model 220. I did have to make an anvil to reach inside but, it worked very well. I modified a 38 Turkish receiver to a G33-40 profile. The thread relief is deeper on the Turk than a G33-40 receiver I have so, I will use it for a lower pressure cartridge.
Mark Poley

P.M. Sent

Here is a crude mic you can make if you have a small Starrett dial indicator. This tool is within .002 if you are carefull with bending the arms. I made this tool back in 1964 when we had lots of shotgun chokes to recut. It can be used to make a quick dimension check on anything within its range. It may look stupid, but it was the best thing we had in the old days to check a shotgun chamber for a swell as you move it inside the chamber. It will work for you on the action measurements on the C-Ring. Place inside and dial the indicator to zero, next use a mic to check across the round ends until it reads the same when inside the action. The tool is easy to make and is well worth the time.

Thanks Les. Sounds similar to what Mark Poley uses. Thanks for the pic!
Matt

Hi Mark,

Was the 38 Turk that you measured and modified a M 1903 Turk or a K.Kale model?

thanks

It was a K.Kale model.
Mark

Maybe use a Swede action? This is my Swede G33/40 cut 7x57 that Jim Wisner metaled.