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Post by jjsharpshooter on Nov 16, 2015 21:37:26 GMT -5
Need some possible answers and a solution. Have been loading my bisley 480 with 70/30 cast miha 395 gr HP. Using 13 gr of hs6 powder, using new starline cases which have been sized and inside/outside chamfered prior to loading. Just started pc'ing these bullets. Today when shooting I am getting rings of lead remaining in the chambers after firing, they seem to be in the end of the chamber at the case mouth and come out easily. Bullets were sized after PC and push thru the throats with a little resistance. What's going on? Anyone ever have this?  |
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Post by paul105 on Nov 16, 2015 21:45:54 GMT -5
Didn't know there was a "checked" version of the MIHA. Anyway, I encountered the same problem with the plain based version when crimping in the TOP crimp grove. The problem went away when using the bottom crimp grove.
If you are already crimping in the bottom cr grove, then I DON'T KNOW.
Paul
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Post by jjsharpshooter on Nov 16, 2015 22:14:53 GMT -5
Crimping in the top groove now, lots of lead in bbl and am cleaning it now.
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jsh
.327 Meteor
Posts: 884
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Post by jsh on Nov 16, 2015 22:32:14 GMT -5
Same here.
Plain base, powder coated, unsized.
I only had two cylinders do it.
Jeff
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Post by hoover on Nov 16, 2015 22:36:34 GMT -5
I get it too! I save them and throw them back in the pot! Told you I was cheap!
I will say it appears to happen less, the more you shoot your gun. Don't know why.
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Post by jjsharpshooter on Nov 16, 2015 22:44:14 GMT -5
Anyone know why?
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Post by hoover on Nov 16, 2015 23:18:53 GMT -5
 I'm gonna take a guess. The picture shows how I deep seated a PC bullet without using the crimp groove. When crimped, you make your own crimp groove with cast bullets. I then used an inertia hammer to dislodge the bullet to show the crimp I made. When doing this, a lead wire ring also appeared. My guess is that upon ignition, that split micro second before crimp is released, the PC bullet scrapes against the tight crimp, making the lead wire ring. The PC bonds to the lead, causing the slight lead wire ring. Never saw it with regular cast. As bullet exits cylinder mouth, the wire ring is left behind. That is my guess. Have no way to prove, but am open to any other explanation. |
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Odin
.327 Meteor
Posts: 971
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Post by Odin on Nov 16, 2015 23:27:22 GMT -5
Here's a SWAG - With PC the baking process softens the metal, with some suggesting the BHN dropping as low as 10, or even lower. With ignition and liftoff the bullet is slammed against the trailing edge of the crimp groove, which is supported by... another groove. That thin ridge between grooves is then ripped right off the bullet. The case crimp fully opens only when it encounters the first drive band. A possible cure is a lighter crimp. IMHO with good case tension on the bullet there isn't much need for a heavy crimp with light to medium loads. I'd probably try crimping just past the point of straightening the case and see if this cures it. -Rod |
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Odin
.327 Meteor
Posts: 971
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Post by Odin on Nov 16, 2015 23:29:08 GMT -5
Jeff, I think we're basically saying the same thing. Do you typically crimp heavy? Regardless of load?
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Post by jjsharpshooter on Nov 16, 2015 23:34:17 GMT -5
I think it might have been my crimp, I had crimped these harder than some I did before and I didnt see this happen on them, will try them at the range again tomorrow, thanks.
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Post by nolongcolt on Nov 16, 2015 23:47:17 GMT -5
That's what ya'all get for horsing around with this new fangled PC stuff! Just give me old fashioned barrel leading, I know how to get that out. LOL..
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Post by jjsharpshooter on Nov 16, 2015 23:49:33 GMT -5
Yep, just started pc bullets, with these new issues I might go back to greasing them up.
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Paden
.375 Atomic
Lower Goldstream Creek
Posts: 1,132
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Post by Paden on Nov 16, 2015 23:59:17 GMT -5
Never saw it with regular cast. I've seen it with plain cast in my .45 when I first began working up loads for the gun. Got some barrel leading along with it too. Could have been light loads pulling through my heavy crimp, or could have been oversized bullets shearing through the throat transition (guesses). Never determined the cause. It eventually resolved with proper sized bullets and different loads. I also fire lapped those throats a little bit before it was over, so who's to say what the cause was? The only constant was my crimp; I've always used the same brass and crimp. |
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Post by 2 Dogs on Nov 17, 2015 7:21:08 GMT -5
I suspect the bullet is too soft.
Now, I don't know, and I am not currently powder coating my bullets but I do have a suggestion...
Simply try a harder bullet. If you have a bullet hardness tester all the better.
If this malady continues with the harder bullet, you might have your cylinder looked at. The case mouth/throat edge may need to be softened or chamfered.
My 2 cents!
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Post by hoover on Nov 17, 2015 7:23:08 GMT -5
Odin, I crimp just enough to thwart bullet jump. No more, no less.
That little wire lead ring doesn't bother me in the least. Out of a box of 50 handloads I may get 5 or 6 rings of lead. Most guns and loads, none. As a former dedicated traditional cast bullet lube/sized shooter, I still say the advantages of PC far outweigh traditional cast in speed of processing, accuracy, leading, bullet performance, as in expansion, long term storage, and cost.
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