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Old 09-20-2012, 21:05   #21
nickE10mm
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Quote:
Originally Posted by Cwlongshot View Post
I am also working up a loading with Longshot and a 200XTP. I loaded to 9g with zero pressure signs...

6"KKM barrel and a G20...

CW
Same load I use regularly for hunting with 6" fully supported barrels and new brass. STOUT, over max, but very very nice.

**TO ALL SEEING THIS: Please do your own workups!!!**
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Why do I carry a 10mm?
“Because a 9mm only kills your body… the 10mm kills your soul.”

Last edited by nickE10mm; 09-21-2012 at 11:23..
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Old 09-21-2012, 04:06   #22
Cwlongshot
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Quote:
Originally Posted by alank2 View Post
Hi CW,

What oal are you loading to?

My chrono results:

Winchester 10mm Brass (1F), Hornady XTP 200gr (.400), Hodgdon Longshot 7.5gr, CCI Large Pistol (#300), 1.250 oal

Avg 1060, sd 13, es 39, temp 85 F, n=10 G20 with SL barrel

Thanks,

Alan
Max that will feed thru my mag. 1260 IIRC...

CW
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Old 09-22-2012, 11:47   #23
gofastman
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I personally think that AA7 and AA9 flatten primers more than other powders because they are such small, fine, sand-like particles that get down in the primer pocket and flatten them. Try using case expansion instead of primer flattening to guesstimate pressure next round. Just an idea.
I have heard this before, maybe it was from you, or someone echoing what you had said, I don't remember.
it does sound reasonable though, that stuff (AA#9 in my case) is super fine.

To the op:
I have not found anything that meters too much better than Longshot in my LEE powder thrower, and its great for velocity.

AA9 clogs up my Lee thrower because it is so fine, YMMV.

Go with Blue Dot if you want fireworks, that stuff is just too fun!
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Old 09-22-2012, 12:06   #24
Cwlongshot
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Just a note on pressures and watching for them...

Measuring case heads IS a accurate way if all things are equil. BUT at pressures under 40K it's simply not gonna happen. Meaning most handgun loadings cannot be accurately estimated by measuring the case head expansion. By the time you see measurable expansion your already past the SAMMI spec for this caliber. The 10mm is right on the cusp of this 40K pressure limits so it's possible some measurable expansion will be found.

Primers alone are a POOR choice for looking at pressures. YES hi pressures will likley have flattened primers. BUT you need to know what your looking at and this comes with experience.

Noise, excessive recoil as well as flattens primers and as you get to the top pressures case head expansion.

As mentioned, be careful and watch all signs of excessive pressure if your gonna push the limits and find your own maximum. Once you reach the limits, your best served to back off and set your guns limit for BEFORE pressure signs appear.

CW
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Old 09-23-2012, 17:36   #25
nickE10mm
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Quote:
Originally Posted by gofastman View Post
I have heard this before, maybe it was from you, or someone echoing what you had said, I don't remember..
I've said it before but I think I originally got the original post in this forum was by Yondering... can't recall
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10 Ring #1033 - Longslide #1045 - 10mm Loader #1066

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Why do I carry a 10mm?
“Because a 9mm only kills your body… the 10mm kills your soul.”

Last edited by nickE10mm; 09-25-2012 at 10:25..
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