rim counterbore cutter

[thesandman]

after reaming my 22mag to k hornet I was to hasty in my final headspace fit.  Shot gun several times using used brass to get all bugs worked out before switching to new brass in a effort to end up with 100 good pieces.  I tried my good brass shooting a couple three shoot groups with both 35gr vmaxs and 52gr hpbt.  everything seemed good.  fast foward to next day.  sent ramer back and now headspace is insufficient.  need about 3 to 4 thou. with winchester brass. but mic shows no difference in rim between win and rem or .001 difference and no more.  What are my options?  Do they make a rim cutter or end mill that is available at local tool supplies.  or re rent original reamer?  Thanks   sandy

[quickdtoo]

Did ya clean the chamber well? Maybe there's something on the barrel face or standing breech face that's actually preventing the action from locking up. Will virgin brass chamber, or is the problem just with fireformed brass? Is the barrel tight with the action locked up and the forend off?

Tim

[thesandman]

barrel and action close and locks both with and without forearm.  I will try cleaning it again. but I left the headspace where it took added effort to close on cases, hoping to shoot in alittle.  but the effort needed to close now is excessive.  Seems to be no difference between unfired and fired cases.  Remington is perhaps abit eassier but not good.  I will clean it out good and get back.  thanks   sandy

[thesandman]

cleaned chamber and it helped alittle but still no good.  I took a used case and filed head down till it closed corectly.  seems to be .003 difference, to point of correctly closing.

[thesandman]

cleaned chamber again and tried it with forearm and without.  It seems it was my poor judgement in headspacing,  I can close a case in and when it is opened it has a scuff mark on btm third of rim face.  I,m thinking a end mill or something to cut .003 to .004 more out will be plenty.   

[45-70.gov]

mount a piece of brass  on a screw
now  mount this in a drill
now apply some lapping compound to the rim


be careful.....no  unlapping

[thesandman]

Thanks Govenor;  Have you used this method?  wondering what it will take in mild steel to take out .003  chamber cut very easy.  This might get me going.  Just kiddin on the govenor.  but thanks any ways brother.  45 70gov.       sandy

[Spanky]

mount a piece of brass  on a screw
now  mount this in a drill
now apply some lapping compound to the rim


be careful.....no  unlapping

 
+1 to this... it'll work just fine.
 
 
 
Spanky

[45-70.gov]

Thanks Govenor;  Have you used this method?  wondering what it will take in mild steel to take out .003  chamber cut very easy.  This might get me going.  Just kiddin on the govenor.  but thanks any ways brother.  45 70gov.       sandy

honest mistake


my last name is Government


the  . [dot]   was   added  when  i entered the computer age
http://en.wikipedia.org/wiki/.45-70   this should explain

[thesandman]

well I've got it back together and scope back on.  I will use a magnifing glass next time I have to do this.  It helped immensely. Looks like when I close action that the only thing hitting is the high spots on head of case.  Like around letters where the stamping caused hi spots.  No slide marks.  Going to sight it in if wind dies down in a bit.  Doesn't seem like very much to cause such a problem. If it shoots in alittle smothing out the high spots it will be perfect.  Thanks again.  Thought I messed up big enough to have to use the 223 till this was up and running.   sandy

[gcrank1]

It is normal with these to need to close them with a 'little authority' too. They are not finely hand built/fitted English sporting rifles that you just 'close' up. When fitted tight, they will loosen some over time (I know it could take a while with a 22H, but it did happen with my tight factory 22 Mag too).

[thesandman]

well I shot two three shot groups at 125yds. one with 35gr vmax and one with 53gr hpbt.  Horizontal spread was almost all within a two bullet width.  vertical is a different story both groups about 1 and 1/2inch top to bottom.  Gun needs more tuning. It started scoring a narrow line about the width of the firing pin.  cant see anything and firing pin seems to be retracted. but every case now has it.  If its not the firing pin I dont know what would cause it reciever face is smooth.  Its better than it was this morning, after lapping the rim couterbore.   thanks forum friends.   sandy       ps this was fire forming new brass  very promissing.   

[mechanic]

Sandman, with the case set back to far, the firing pin is likely binding after firing and sliding by as it opens.  You are in danger of breaking it.  Better lap some more!  Are  the primers perforated?
 
Ben

[keith44]

Sandman, with the case set back to far, the firing pin is likely binding after firing and sliding by as it opens.  You are in danger of breaking it.  Better lap some more!  Are  the primers perforated?
 
Ben

+1


also consider a different primer (harder metal cup)  I use pistol primers in my K-Hornet, but with what you describe you need a hard rifle primer, and perhaps .001 inch more lapping

[thesandman]

I will disassemble gun again.  I think there is something under or a burr on the ejector.  Gun fired and fit good thru a half dozen shots then developed this.  Any way you look at it there is definately a burr under something maybe my skin.   But gun is a blast to shoot.  and I like its thrifty nature.  Got to order bullets, 1680, dies that will get me rollin.  Thanks for your help friends.    sandy       ps  primers are good without any signs of pressure.  might as well do trigger when I'm in there and make a day of it. 

[gcrank1]

The Lee 22H Collet Neck Sizing Die (available separately, got mine from Midway) made my 22H reloading WAY simpler, but Im not sure if it would work with the K. Maybe give them a call and find out. No need for lubing and wiping off every LITTLE case each time.