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Originally Posted by mr10mm
6.5 mpc- $600 for a barrel and brass forming in a pain
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You are right about the high price of the barrel. SSK (J.D. Jones) charged premium dollars for his products. However, the brass forming is no more of a paint than forming brass for the 300-221 Fireball (300 Whisper). I think that all you do is size .223 brass, pushing the shoulder back a bit and trim to length. This is the way I make my 300-221 Fireball brass. Here is a link showing how I am currently making my brass.
http://www.quarterbore.net/forums/showthread.php?t=1763
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Originally Posted by mr10mm
.300 fireball. 7.62x39 ballistics from a case thats easily formed from .223 or .221 and feeds from .223 mags and uses a standard .223 bolt head uses .30 cal bullets from 110-240 grns.
Here is my deal. I am not looking for a sub sonic round. I am looking for an alternative to .223 for 0-250 yard shooting from an ar-15 rifle. I see load data for 125 grn bullets approaching 7.62x39 in a 16 inch barrel.
My questions are:
1. who makes a 20 inch .300 fireball barrel if any? I'm looking for increased velocity over the 16s with 125 grn bullets
2. do i have to modify magazines to work or is there a specific magazine or magazines available that work with both .223 and .300 fireball?
3. for super sonic loads will I need an adjustable gas block or tube? I'm looking to shoot 110-130 grn bullets not the super heavy stuff.
what say ye?
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1.) If you want a 20-inch barrel you are going to have to order one. I would suggest that you call Noveske Rifleworks. He made a 16-inch barrel for me and it is one of the most accurate barrels that I have ever shot.
Why do you think that you need a 20-inch barrel? I can get 2250 fps from my 16-inch barrels without pushing the pressure limits. If I push the pressure limit, I can get 2350 fps. With the rifle sighted in 3-inch high at 100 yards, you will have a direct hold out to about 220 to 230 yards.
2.) No. You should not have to modify the standard AR15 mag to make it work. I would suggest that you chance the green follower to magpul follows and add heavy duty mag springs. I did this and the reliability increased significantly. I also use the same upgraded mags in my 5.56mm AR15 as well.
3.) If you are going to just shoot super sonic loads you can probably get by without using an adjustable gas block or gas tube. The question is do you want the gas port in the carbine position or the pistol position.
The pistol gas port position gives you a bit more flexibility with being able to shoot both sub-sonic and super-sonic loads without having to go to an adjustable gas port. I have found a gas port diameter that works without any adjustments for both sub-sonic and super-sonic loads. Here is the post
http://www.quarterbore.net/forums/showthread.php?t=1784
The carbine gas port position gives will shoot super-sonic loader a bit better. But if you want to be able to shoot sub-sonic loads you have to open the port diameter quite a bit. Thus you will need an adjustable gas block or gas tube to close the gas volume down when you shoot super-sonic loads.
If you have any additional questions just ask.
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