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IOwnDoubles
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.222 rimmed martini
Dec 5th, 2015 at 12:38am
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Don't know if this should be here,or in reloading or gunsmithing...
Finally getting to my sportco martini I bought last January in Vegas. My Bertram cases don't fully close in the gun. Fully resized and measured the cases and they are under 1.7.   Don't know if the rim is too thick on these cases or it it is the gun.  Obviously the gun has been fire before I bought it.

Don't know if I should look at the barrel the bolt or blame the brass

Any suggestions on what to try next
  
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Cat_Whisperer
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Re: .222 rimmed martini
Reply #1 - Dec 5th, 2015 at 8:31am
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So the question is where the interference-fit is.

Since .222R and .38 spcl have the same diameter at the base, you could run the 38 into the 222 die and see if it chambers.  Compare the rim thicknesses.  If it chambers and the rims are the same, then the interference is in the length of sizing the 222r.

38's are plentiful and cheap - try thinning the rim to see if that helps.

Might be the 222r needs to go into the die further (if the base causes the interference - then there are things that can be done to fix that.)

Try something, eliminate one or more of the possibilities.
  
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Skalkaho
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Re: .222 rimmed martini
Reply #2 - Dec 5th, 2015 at 1:58pm
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Paint a case with black felt pin, then tap the case  in alittle farther than you usually do. Use a ramrod to push it out. Wheres it rubbing? at least you know more than before and correct or modify die, etc. May have to do a chamber cast.........
  
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IOwnDoubles
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Re: .222 rimmed martini
Reply #3 - Dec 5th, 2015 at 7:09pm
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Resized a .38 special case. Same result. I tried measuring the rim thickness and the 38 is more consistent than the Bertram brass. Going to drop the breechblock next

Funny thing is I assume this gun was working before I got it

Also. When I converted my last martini to 357 mag. I bushed the fired pin and did not have to do any thing else to the breechblock
  
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IOwnDoubles
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Re: .222 rimmed martini
Reply #4 - Dec 5th, 2015 at 11:58pm
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Put a 38 in the drill press and shaved down the rim. Went from .055 to .051 and the gun closes without a lot of effort

Finally dropped the action and can see the breechface is pitted. Think if I clean it and the barrel I'll gain the .004 needed
  Any thoughts about this?  I always appreciate the advice from this group
Jerry
  
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Cat_Whisperer
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Re: .222 rimmed martini
Reply #5 - Dec 6th, 2015 at 8:12am
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Now you're past my level of experience.  But cleaning is always good.

  
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stevelins
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Re: .222 rimmed martini
Reply #6 - Dec 10th, 2015 at 9:35pm
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I have some of the super brass you could try. PM sent.
  
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IOwnDoubles
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Re: .222 rimmed martini
Reply #7 - Dec 15th, 2015 at 12:22am
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After a lot of deliberation on whether to rent a reamer and check the rim depth or face the bolt.  I decided that the barrel was set back too far, the breach face was pitted so I faced the bolt.  Took off about .004.  The bolt face looks great, it is still a very tight closing.  Now, I can't wait to shot it to see if how it shoots.

It doesn't appear that the firing pin has been turned down... I thought DeHaus said your need to do this on high pressure cartridges?

Jerry
  
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