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  #31  
Old 01-20-2019, 04:07 PM
Wolfram Malukker Wolfram Malukker is offline
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So far, total cost of dies has been 30$, the brass is all range brass. I had a little bag of 100 Hornady 55gr FMJ-BT's which are the heaviest bullet that should be loaded in this case. I've got all the steel and such to build another Chicopee CF action, so all I'm looking for to finish up this project is a 1:12 twist .223 caliber barrel.

For the barrel, I've got my eye on a Winchester Model 70 barrel in .222 that's on Ebay right now. I'll buy it for 30 bucks, or I'll wait for the Remington 40X take off barrel that ends in a day or so. Both are under 40 bucks shipped right now, and if I don't win on, then I don't win and I'll just have to wait a little longer to either buy a blank from GM, or for another barrel to come along.
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  #32  
Old 01-21-2019, 12:34 AM
camel camel is offline
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Been watching this one from afar, only one question for you, why would you bother stuffing around with take off barrels if you are going to be wanting to test this out all the way ? Personally, a new blank would be the go, and I have used a couple of Green Mountain blanks, they might not be the biggest name, but they sure work well.
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  #33  
Old 01-21-2019, 01:29 AM
Wolfram Malukker Wolfram Malukker is offline
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Cost and a frozen shop. I'm doing this because I'm unemployed and bored.

30 bucks for a barrel that will need to be shortened slightly on the breech end, and touched up on the muzzle end, is a LOT less time and money than a 75$ 1.25" blank that will need to be turned, trimmed to length, lapped, and chambered in a 25* shop.

If I don't find a good take off in the next week or two I'll spring for the GM 1-12 twist barrel, but there are a LOT of new or nearly new 1-14 twist barrels out there for .222 chambered guns-I watched auctions for weeks before deciding it would be possible to get one.

As for 30$, that's my arbitrary weekly hobby spending limit while unemployed. If I can trade for it, or buy it for 30$ or less, it's OK. More than that is to be avoided, at least until I have a job again.
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  #34  
Old 01-22-2019, 10:31 AM
camel camel is offline
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Well that certainly answered my question, and I don't blame you, being unemployed sure stuffs things up as far as building new toys goes, am going through the same thing myself. Am having a temperature trouble here myself, only in the opposite direction, its been well over the 40c mark here for the last couple of weeks, and its not letting up at all, 47c predicted for thursday.
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  #35  
Old 03-05-2019, 04:39 AM
Wolfram Malukker Wolfram Malukker is offline
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Working on this still. Have been getting frustrated with some machining problems, the bar of steel I started with is so hard, I was unable to tap threads for the action screws. I'll have to put it into the heat treat oven and soften it up, finish the rough machining, then re-harden and have the bolt raceway EDM cut. The more work that gets done before the bolt raceway, well, the more warpage that will happen.
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  #36  
Old 03-06-2019, 03:53 AM
TAJ45 TAJ45 is offline
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Default Just a volume measuring suggestion

Your results seem to be consistent. So this idea may not be all that critical to your end game.
I wondered how close eyeballing the " fill to bottom of neck" could be accomplished.
My first thought would be to take a caliper measurement from mouth to neck shoulder junction and do the volume math and subtract from a full case reading thinking a more visible fill point would be more accurate.
This may not be as critical as a larger, long necked case.
Anyone?
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  #37  
Old 03-07-2019, 03:40 AM
Wolfram Malukker Wolfram Malukker is offline
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So working on this again-and I decided to go back and work out case volume again. I did something wrong measuring the first time-these case volumes are similarly consistent, but the actual volumes are not quite right.

I did the .256 Win Mag cases, and the volume was 17.2gr to the bottom of the case neck. Filled to the top of the case, they're 21.1gr of water.

I went ahead and formed up the .220 Meteorite cases, and as I measured before, 17.0gr to the base of the case neck, and 20.8gr to top of the case.

These are volumes as measured from 10 cases, averaged.

That's pretty darn close to .221FB capacity. The plan is to set this up with 45 to 55gr bullets, so I want to see a 1-12, or 1-8 twist barrel. I'm thinking 1-12 twist.
Armed with this data, I did some research on loadings. I limited myself to 53 and 55gr bullets for load data, 1-12 twists, and only when I knew what they were shooting out of.
I have settled on a starting trial load of 15.5gr IMR4198 (which I have on hand) under the 55gr Hornady bulk packed FMJ.

I'm basing this load on data given for 17.5gr of IMR4198 under a 53gr Hornady V-max, which yields velocities of 2940FPS from a 23", 1-12 twist barrel, as fired from a Thompson Contender. I found several different people shooting that load, all reporting very close data, from 20 to 23" barrel lengths, all with 53 to 55gr bullets.

I figure backing off down to 15.5gr of powder will lower the pressure enough to be safe for initial testing, and give room to work up. Is this the proper way to do the job?

The only reason to consider the 1-8 twist is that it's SO inexpensive to obtain-65$ for a chambered barrel blank, 24" long.

Last edited by Wolfram Malukker; 03-07-2019 at 03:53 AM.
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  #38  
Old 03-07-2019, 07:11 AM
Wolfram Malukker Wolfram Malukker is offline
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Totally forgot about the primer. I guess, but I do not know, that I should be using a Small Rifle primer when using .221 Fireball load data, and Small Pistol primers when using reloading data that calls for them. Is this correct?
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  #39  
Old 03-14-2019, 04:38 PM
Wolfram Malukker Wolfram Malukker is offline
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A proper 25" blank has been acquired for this, .224" groove diameter, 1-12 twist. It's only 0.970" in diameter at the shank area-the gunsmith goofed and it won't work for many actions now. It was priced accordingly!

Hopefully I'll get some more money to work on this soon-my former employer has been calling asking if I'd like to come back to work for them. I've told them it could be considered-that was a good job.
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  #40  
Old 03-30-2019, 05:31 AM
Wolfram Malukker Wolfram Malukker is offline
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Alright, load development has started-some Quickload data for perusal:

55gr Hornady #2267B


16.5Gr N-120 , 100% density, 44,597 psi, 2655 fps-16" barrel

17.5gr N-120 , 106.8% density, 53,439 psi, 2794 fps-16" barrel 2910 fps 20" barrel

15.5gr IMR4198, 96.3% density, 38,316 psi, 2514 fps 16" barrel

17.5gr IMR4198, 108.7% density, 54,299 psi, 2818 fps 16" barrel.


46gr Speer #1024


17.5gr IMR4198, 104% density, 43,803 psi, 2853 fps 16" barrel.

18.5gr IMR4198, 104% density, 51,801 psi, 3012 fps, 16" barrel.

19.9gr N120, 110.9% density, 54,950 psi, 3074 fps, 16" barrel.

It looks like H110/W296, LilGun, IMR4227, 2400, Alliant Reloader-7 will all be usable although not as good as IMR4198, AA1680, or N120.

N110 would allow me to get more powder into the case. but it's a faster powder. I'm not so sure I need a less bulky powder, it's 800g/L vs N120's 860g/L.
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