Author Topic: Is it possible?  (Read 452 times)

Offline Flygrimm

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Is it possible?
« on: January 12, 2019, 03:36:04 PM »
Let me first state that I have not assembled my rifle yet but looking ahead.   As stated in another thread my barrel has what appears to be about average jump to the lands.  If loaded to 2.26” the jump for the 90 SMK is .058” and .096” for the 88 ELD-M.

If I can’t get it to shoot well is it possible to have the barrel re-chambered?  I suspect that would entail removing the barrel extension, threading the barrel so the extension can go precisely one more turn, recut the chamber and reinstall the extension. I expect the difficult part would be getting the extension threaded on exactly another 360 degrees.  The other issue would be what reamer to use.  There’s been a lot of talk about bad reamers, I wouldn’t want to reuse one of those.

You’re thoughts.

Stuart

Offline CCW

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Re: Is it possible?
« Reply #1 on: January 19, 2019, 08:19:33 PM »
Those figures compare to what  I have.  I measured the COAL to be 2.345 with the 1X HDY case stuffed with a 90 gr SMK, for the ogive to touch my rifle lands. [ 2.345 - 2.260 = .085".]  Of course the dimensions have tolerances because of case head irregularities after firing and the irregular Meplat on most OTMs.  Some reloader folks have run the COAL out to 2.310 with no jams out of a 6.8 magazine in an AR lower.  There is now a new design Valkyrie 10 rd mag with the front bulkhead cut out entirely to better handle the over sized COALS.  Where I have looked those are out of stock [ Modified FXO PRI 6.8mm magazine, steel waffle design ]

Offline KRC

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Modified "Window" Magazines
« Reply #2 on: January 21, 2019, 01:28:53 PM »
I have not done this to any 6.8SPC mags yet, but to regular metal .223 mags.

The front of the mags can be cut away to permit OAL's of 2.32X". I have altered a couple of 20-round .223 mags this way. I've seen commercially modified mags for $50 each, but this modification can easily be done with lower cost standard metal mags. I’ll try to post an image below.



Not the slickest looking, but fully functional. I've had no misfeeds from either regular (2.255") or long (up to 2.320") OAL .223 rounds. One of my .223 Wyldes likes the longer OAL's, one doesn't.

Offline binazone

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Re: Is it possible?
« Reply #3 on: January 21, 2019, 02:00:13 PM »
I did the same thing with an AR Stoner 15 round 6.8 mag that I bought from Midway. It was not well made and wouldn't let me load anything 224V longer than 2.270". After making the window, I found out it will let me load my 75 or 88 ELDMS, if needed, out to 2.348" in a Stag Arms lower that I have. I've used it many times, loaded with up to 12 rounds and not FTFs or any other malfunction. The other lower that I use for 224V, an Anderson, will give me a max COAL of 2.325".

Dremels are wonderful things.

Offline CCW

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Re: Is it possible?
« Reply #4 on: January 24, 2019, 04:24:23 PM »
I love it!   The 224V saga is turning us into wildcatters.

Need shorter jump to lands for accuracy = longer COAL; yes, but shorter jump means lower velocity; yes, but extra case volume means more powder payload space for higher velocity; yes, but longer COAL means won't fit AR magazine; yes, but modified mag case with front side cut out will feed OK, anyway. Beautiful! 8)