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Post by blackbahart on Oct 7, 2013 0:20:58 GMT -5
I was doing some mockup and research on the 338-223 strait/ here are some pics and my conclusion after my measurements.the case will hold 26.9 gr of water at 1.380 and with the 200 gr spritzer will hold 13.3 gr water . Will not hold the 19gr of 4227 that COTW shows for the load .The useable space was 11 gr mounded . This cartridge will be more in the class of the 35 wsl not the 351 from our calculations and should cycle the 1907 as I tried a 10 gr load of the 35 wsl ,just lazily and should have no problem to cycle a 1905 due to the lighter weight . I still plan to persue converting one to use this round . Any input from anyone out there who has done this?
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Post by blackbahart on Oct 13, 2013 16:03:44 GMT -5
we ran the #s through the quick load program and our speculation was correct on it will be in the class of the 32/35 wsl .The projected data looks like a 200 gr spire point at 1430-1480 fps with the power capicity at 35000 psi.
probably no real advantage other than being able to say "I have one" .Looks like regular 223 dies will work and to chamber it will just have to grind back a 223 reamer and some chamber polishing ,and a slight throat .Will throat after chambering as the bullet ogive is actually in the case and may just need a transition to engage the rifling .
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Post by blackbahart on Dec 5, 2013 22:20:06 GMT -5
finished making 338 barrel blank and will start on it next weekish .still waiting on the 223ackley reamer
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Post by blackbahart on Nov 28, 2014 12:51:18 GMT -5
have not progressed to much on the project .The barrel is chambered and contoured and threaded to the receiver .Made the lug and guide rod still have to attach to barrel and need extractor and feed ramp to do ,but I am still working on it.
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Post by blackbahart on Dec 3, 2014 10:17:11 GMT -5
yesterday we finished cutting feed ramp and extractor ,hand cycled the action to test feeding and extraction /ejecting and it seems to work as it should . Lou took the barrel to his place to his place as he is set up to silver solder the stainless lug on to the barrel.
The barrel is currently 27 inches long and we are going to do a test to see if there is a reason that the original length of barrel 22 and 20 were for a reason or just to make the rifle a handier length .
Will have barrel back on Friday and will put the 07 back together and start a cycling test with the 200 gr 338/11 gr imr 4227 loads before finish milling the sight doves to finally learn if the shorter barrel was really necessary for the rifle to function properly. I will update with some pics on the week end if all goes according to plan.
Cheers Peter
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Post by blackbahart on Dec 5, 2014 20:12:47 GMT -5
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Post by blackbahart on Dec 16, 2014 1:47:52 GMT -5
Did some load experiments on the week end ,my first test loads I made up were actually 11 gr of 4227 not 12 according to my notes.I made up some 12gr and the rifle did not fully eject and trapped the spent round /stove piped.The 13gr the rifle fired but did not even attempt to cycle ....strange same thing with the 14gr but was able to easily eject the spent cases easily with by thingying it .
Now went with 10gr rifle cycled perfect also 9gr also no problem same with 8gr and 7gr .Looks like it likes 10gr with the modified hornady bullet .The program estimates the MV at 1458 fps .
I took a few shots at some clay pigeons at 25 yards set on a snow bank and the sights were actually on and 5 for 5
I found it strange that the 12gr and up wouldn't cycle ,Don't think the longer barrel would cause this situation if any thing it should enhance the cycle .
The barrel is 318 SS and may be the SS properties are increasing the dwell time of the cartridge with the heavier loads and not leaving enough energy to complete the cycle as the cases are easy to remove manually or maybe the weight needs to have some material removed to lighten it ?
I am stumped currently as when I try the hotter load it doesn't cycle but when manually cycled the case is easily removed from the chamber.When I used a hotter load in my 351 I had to use a cleaning rod to coax out the fired case as it was stuck .
Any ideas as to why this is happening would be appreciated or option 2 would be to use it for subsonic loads
cheers Peter
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Post by Hardrada55 on Dec 16, 2014 8:45:22 GMT -5
The only thing I know about your problem with the heavier loads not ejecting is what John Henwood mentioned in his book. He said (and I paraphrase here) that loads with too much pressure would cause the cartridge cases to fail to eject as surely as cartridges which were loaded too "lightly" and that this failure to eject in "heavily" charged cartridges sometimes caused reloaders to attempt even "heavier" loads with disastrous results. Your 12 grain loads may have just a touch too much pressure to allow the curious beast called the delayed blowback action to operate as designed. I admire your skills. Are you doing this on an 07 or an 05? I don't think I remember which one.
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Post by blackbahart on Dec 16, 2014 11:11:58 GMT -5
I am using a 1907 made in '49 according to ser #
with the 12 gr load the program estimates pressure to aprox 33000 psi and the 11 gr to aprox 25000.
When we relined the other 1907 to 30 carbine I turned down a used chrome moly 30-06 to sleeve the barrel and I use factory 30 carbine ammo in it with no issue and they run aprox 48000 psi
The 1910 I got bore out and rifled to 44 amp again chrome moly and no issues .
I think the SS might be my issue as I couldn't find any delayed blow back rifles with SS barrels yet .I will put it away for now as it does work and when the weather warms up I will switch the breech block to a 1905 32 wsl and see if it makes a difference.
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Post by blackbahart on Jan 12, 2015 13:02:12 GMT -5
here is a pic of competed rifle in 338-223 short and the ammo that cycles /works
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Post by blackbahart on Feb 13, 2015 22:51:03 GMT -5
took the three misfits apart this week and sent them off to cerakoting in socom blue .Decided that there is no real collector value in these cobbles so might as well let them look pretty LOL .Will post up some pics when I get them back and assembled
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Post by blackbahart on Mar 14, 2015 21:16:43 GMT -5
338-223 We solved the issue of the rifle not cycling with the heavier loads !! It turns out that I didn't have enough throat ,Because the bullets were seated so deep I only put a .050 throat .Upon discussing with our other cohorts we decided to deepen the throat to .200 did some more load testing and now with a new rn bullet 180gr ,18 gr 4227 @1875 -1850-1895-1864 -1876 and no hicups ,so it wasn't the SS barrel after all and it runs along the spec of the 351 WSL Cheers
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