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February 11, 2010
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Can I get you guys to look in your books and tell me what the
C.O.L max. and min. for a 180grn HP 10mm is ?
Load is - 180 grain Golden Saber Bullet, 8.6 grains of Power Pistol powder,
Winchester primer, Star line brass.
I know the COL recommended is 1.25 but I need to know the max
and min range, mostly the min because I think the ones I have here
are too short.
This adds another question, "too short of a COL will cause pressure
spike" is that correct ?
Thanks for any info.
-Blacktop
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Range Officer
Range Officers
May 2, 2009
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I take it you didn't get my e-mail-- Speer #12 says COL is 1.250"
I've never seen a min/max for COL -- partly because to short OAL will cause a SIGNIFICANT increase in pressure... and I do mean SIGNIFICANT 
...
SHOOT
February 11, 2010
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Nope , no email 
who knows ?
Some manuals show a min and max, Vihta Vuori shows COL 1.26 to 1.24
with 1.25 recommended. Didn't know if any one else had any detailed
info on Power pistol.
I'll give Alliant a call and see what they say.
-Blacktop
Supporter
Range Officer
Range Officers
May 2, 2009
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An EXPERIENCED reloader may load them with a shorter or longer OAL--but you need to accommodate for the extra pressure that will be guaranteed with a short OAL.
Only reason to load shorter is to fit long heavy bullets, or for tweaking feeding problems in semi-autos. Both of these situations will require reduced loads.
SHOOT
February 11, 2010
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OK got off the horn with great guy at Alliant, Discussed load and he said
anything within 20 thousands should be fine. My COL is between
1.23 – 1.225.
Shot 20 rnds and not even the slightest sign of any pressure gremlins.
-Blacktop
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