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Posted: 1/19/2014 5:26:59 PM EDT
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I recently got some new hornady projectiles and am having some trouble with them.
I am loading 60g varmints and the projectile has to taper on the bottom and I am having trouble loading them with it not screwing the mouth of the case up any ideas. Also I could not find a tested coal in my book for a 60gr I am loading at 2.250 Also I got a box of 68gr match bullets and I loaded at 2.260 and I still heard the powder being compressed at that length. It's 23.5gr of 4064 will that cause any problem never had a issue like that |
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You should always chamfer the case mouth. There are special little tools for cleaning up the inside and outside of the mouth. That slight inward bevel (chamfer) helps the flat bottom bullets slide in.
link to midway usa, this is the same rcbs tool I have used for years. http://www.midwayusa.com/product/789334/le-wilson-chamfer-and-deburring-tool-17-to-45-caliber |
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With 4064 it's almost impossible to get a decent charge in the case without MAJOR compression of the charge. When I tried, the compressed powder slowly pushed the bullet back out, increasing the OAL beyond what was usable.
Basically, I'd go so far as to say 4064 is not practical for use 223. |
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Quoted: So are you saying that if the powder is compressed I should not use it. And to pull the bullet or get the oal to where it's not compressed A slow burning powder (IMR-4064 in 223) will normally fill the case fully and the loads will be compressed. Totally normal. 2.250 OAL is fine. Either bullet you mention. I suggest you get a slightly faster burning powder for use in 223, and the load will not be compressed. If a compressed load bothers you. Try some ball powder as it measures much better than the extruded IMR-4064. CFE 223, Tac, H-335, A-2230, W-748, ect. No compressed loads with the powders I listed. The tapered end of a bullet is called a boat tail. These normally seat easier than flat based bullets. You should chamfer and debur your case mouths after trimming cases to length. Welcome to the forum.
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Quoted:
So are you saying that if the powder is compressed I should not use it. And to pull the bullet or get the oal to where it's not compressed I am not saying either of those things. I am saying 4064 is not the powder to use for 223. I'd say find a different powder that's better suited to the case and bullet you want to use. 4064 functioned but delivered very low velocities with the charge I could get in the case. I ran into troubles with compressive stresses long before I got to reasonably high velocities. |
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Quoted:
Something kind of related--I understand why you need to chamfer the inside of the case mouth, but why is it done to the outside of the case mouth? If you leave a burr on the outside the case may not seat into the chamber correctly (greater diameter than normal) or it might apply additional pressure to the bullet and therefore increase pressure. At least that's what I think. I don't know any of this for a fact. |
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A burr could affect feeding/chambering but it could also break off and over time you might get some small pieces of brass in the action of your rifle - causing functioning issues if it works itself into the wrong spots.
You don't take a lot of brass off the outside - just enough to make sure its smooth. You don't take a bunch off the inside either, just a small amount to help the bullet base start into the case mouth. |
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Quoted:
I recently got some new hornady projectiles and am having some trouble with them. I am loading 60g varmints and the projectile has to taper on the bottom and I am having trouble loading them with it not screwing the mouth of the case up any ideas. Also I could not find a tested coal in my book for a 60gr I am loading at 2.250 Also I got a box of 68gr match bullets and I loaded at 2.260 and I still heard the powder being compressed at that length. It's 23.5gr of 4064 will that cause any problem never had a issue like that http://www.ar15.com/forums/t_6_42/415854_Seating_flat_base_bullets_in__223.html |
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