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Author Topic: 243 Rechamber Suggestions??  (Read 1445 times)

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Offline krod47nw

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243 Rechamber Suggestions??
« on: April 27, 2008, 01:50:29 PM »
I have a 243 barrel that I've listed in the classifieds with no takers.  This is really not one of my favorite chamberings, so I thought maybe a rechamber.  Any suggestions on a rechamber that would work on a 243?  I don't think there is enough material for a 6mm rem, which would be my choice.  Anyone have any ideas?

Kevin
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Offline quickdtoo

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Re: 243 Rechamber Suggestions??
« Reply #1 on: April 27, 2008, 02:13:34 PM »
6mmAI is doable, in fact I'm doing two of them, the t-hole Ultra and a CVA Optima Elite, I need to shoot the OE to make sure it shoots good before I send it off to Wayne for the work.

Tim
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Offline krod47nw

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Re: 243 Rechamber Suggestions??
« Reply #2 on: April 27, 2008, 02:35:17 PM »
Tim,
I have never owned any of the AI family.  I understand they will also safely fire the unmodified parent round, is this correct?  What is the expected accuracy of the parent round from an imptoved chamber?   Does Wayne York already have the reamer?


Kevin
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Offline quickdtoo

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Re: 243 Rechamber Suggestions??
« Reply #3 on: April 27, 2008, 03:40:05 PM »
In theory you should be able to shoot 6mm ammo in the AI chamber as is intended with true Ackley chamberings, but that would have to be dependent on how the ammo fits the chamber as cut. The only caveat is that in a bolt gun, you have a bit more leverage in closing the bolt on a round that may be a bit tight, a Handi doesn't have that leverage and the action may not close completely which would make it a handloading affair only. I have the reamer, it's the custom reamer Mac had made for the Hornady hydraulic case forming die which I bought from him. My plan was to ask Wayne to ream the two barrels in exchange for the reamer, haven't talked with him about it yet, but I think Mac did before he changed his mind on the project.

Tim

http://www.gboreloaded.com/forums/index.php/topic,124004.msg1098432652.html#msg1098432652
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Offline krod47nw

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Re: 243 Rechamber Suggestions??
« Reply #4 on: April 27, 2008, 04:36:51 PM »
Tim,
Would it be possible to specify my intent to fire std 6mm rem cartridges as well as 6mm AI to wayne and get the chamber cut?
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Offline quickdtoo

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Re: 243 Rechamber Suggestions??
« Reply #5 on: April 27, 2008, 06:15:41 PM »
I'm sure he'd cut it to the best of his ability, but that wouldn't help with slight variations in ammo, just as handloads aren't all the same. Some ammo might load fine, but on the other hand, some might have a bit too much headspace or be too long to get the action to lock up good which would be the worst case scenario.  If you know that up front and are prepared to deal with it, it should work out fine for ya. For me I'll only be handloading for it.

Tim
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Offline kenbev

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Re: 243 Rechamber Suggestions??
« Reply #6 on: April 28, 2008, 12:19:40 AM »
I have a 243 Handi barrel that has been re-chambered to 6MM-AI. I use factory 6MM ammo with no problems. It shoots real good. I don't hand load, so this is the only ammo that I have to use.....
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Offline krod47nw

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Re: 243 Rechamber Suggestions??
« Reply #7 on: April 28, 2008, 05:01:26 AM »
Quote from: kenbev on April 28, 2008, 12:19:40 AM
I have a 243 Handi barrel that has been re-chambered to 6MM-AI. I use factory 6MM ammo with no problems. It shoots real good. I don't hand load, so this is the only ammo that I have to use.....

How is the accuracy with the factory ammo?  Who did your rechamber?   I have several hundred round of 6mm ammo that I want to at least use up.

Thanks,
Kevin
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Offline quickdtoo

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Re: 243 Rechamber Suggestions??
« Reply #8 on: April 28, 2008, 05:28:34 AM »
Kevin, I'd just send a round to Wayne with the barrel and have him cut the chamber to fit. ;)

Tim
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Offline krod47nw

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Re: 243 Rechamber Suggestions??
« Reply #9 on: April 28, 2008, 06:23:13 AM »
Tim,
Sounds like a plan. 

Thanks,
Kevin
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Offline Steve P

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Re: 243 Rechamber Suggestions??
« Reply #10 on: April 28, 2008, 09:29:16 AM »
I was salivating over that barrel in the classifieds.  Great price.  Graf has Hornady 243AI dies for about $50.  That is what I was going to do, re-chamber to AI so I would not get ammo mixed with 243 ammo I use in my Ruger.   Got to thinking it would be about middle of the road between my 243 Winchester and 243 WSSM so I talked myself out of it.

All of my Handi's so far are lone wolves.  I do not have another rifle in the same caliber.  I did pick up a .223 and 22 hornet which I have contender barrels to match but no rifles.  I will keep ammo separated so no problems there.

Enjoy that barrel and let me know how the AI mod works out.

Steve  :)
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Offline prairiedog555

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Re: 243 Rechamber Suggestions??
« Reply #11 on: April 28, 2008, 11:39:17 AM »
I would consider the .260.  I have read many good things.  A ballistic twin to the 6.5x55 Swede.  An article in Shotgun News says it is favored now by many long distance shooters because of the favorable ballistic coefficient.  Very accurate and easy to reload for.  And is based on .308 case like .243.
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Offline krod47nw

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Re: 243 Rechamber Suggestions??
« Reply #12 on: April 28, 2008, 01:28:46 PM »
Quote from: prairiedog555 on April 28, 2008, 11:39:17 AM
I would consider the .260.  I have read many good things.  A ballistic twin to the 6.5x55 Swede.  An article in Shotgun News says it is favored now by many long distance shooters because of the favorable ballistic coefficient.  Very accurate and easy to reload for.  And is based on .308 case like .243.

I am looking for just a rechamber.  I don't want to invest in a rebore.

Kevin
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Offline GregP42

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Re: 243 Rechamber Suggestions??
« Reply #13 on: April 28, 2008, 01:54:29 PM »
Quote from: krod47nw on April 28, 2008, 01:28:46 PM
Quote from: prairiedog555 on April 28, 2008, 11:39:17 AM
I would consider the .260.  I have read many good things.  A ballistic twin to the 6.5x55 Swede.  An article in Shotgun News says it is favored now by many long distance shooters because of the favorable ballistic coefficient.  Very accurate and easy to reload for.  And is based on .308 case like .243.

I am looking for just a rechamber.  I don't want to invest in a rebore.

Kevin

You could always do a 6mm-284  ;D  ;D  ;D
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Offline NFG

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Re: 243 Rechamber Suggestions??
« Reply #14 on: April 30, 2008, 06:45:21 AM »
By this time in my shooting career I don't see much reason to "wildcat" any cartridge...most of the reasons are/were smoke and mirrors after Chonos became prevalent.  Brass longevity is a function of pressure so keeping pressure below deformation zones will mean more than some fictitious "mechanical" function of a straighter walled case.   

The 243 case is almost perfect for efficiency sake at about 52 gr H2O...the 243 AI is about 57-58 and both depend on seating depth of the bullet or the throat lead.  I had a 26" 6mm-284 way back...65 gr H2O or so.  I could certainly get more velocity but it cost a bunch more powder for the minimal gain...maybe 100-150 f/s real world increase...NOT software calculations...real chrono data... More powder just to equal the 243 "normal" velocity and more again to get any real velocity gain.  You want real world information not smoke and mirrors...calculate drop and wind for 600M and beyond...hardly worth the effort and cost...EXCEPT for the "one off...", only one on the block value.

Take a look at some of the 1000 yd cartridges...they are actually getting smaller in capacity not larger...but you do get a gain in energy because of the extra velocity.

Everyone goes through the "bigger is better and I want HUMONGOUS" phase in this sport...nothing at all wrong with it...without it we would still be throwing rocks or running up trees to hide.

I would guess there is on the order of 50-75 different 6mm cal cases developed over the years...in to days world we have only a few to pick from...I like my 17's out to 250, the 22's out to 450-500, but when the wind starts up the 243 comes out, then the 6.5 and when I really want to reach out and touch something and you have to throw out the anchor to stay put...the 338 takes center stage...for a few rounds at least....amazing what a 300 gr, very high BC bullet at relatively low velocity will do when it does hit a whistlepig or potgut even at extended ranges.

'Njoy
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