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Post by emptyhull on Oct 14, 2009 5:02:03 GMT -5
I have a Colt SAA replica (Gaucho) and I am now loading Unique with a 250 gr LRNFP bullet. I have 2 sources, one states max is 8.5 grs (Lyman) and another (Alliant) states 9.5 grs. I have just shot 8 grs and it did fine. Does anyone know what the max is and the pressure for a modern take on the Colt SAA replica? I believe max pressure is 14000. Thanks, Tim
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Post by taffin on Oct 14, 2009 7:16:01 GMT -5
WITH A 260 JACKETED:
8.0 15,782 PSI
9.0 19,589
9.5 21,669
10.0 23,871
PRESSURE SHOULD BE SLIGHTLY LESS WITH A CAST BULLET
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Post by Lee Martin on Oct 14, 2009 12:33:57 GMT -5
With powder being in shorter supply, I've been using 7.0 of Green Dot under 250 grain casts. It's mild, but accurate in my 45 Colts. May want to give it a try if your run across any Green Dot. -Lee www.singleactions.com |
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Aggie01
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Post by Aggie01 on Oct 14, 2009 13:13:09 GMT -5
I'm using a kooz cast 255 Keith in my New Vaquero. I went up to 9.5 grains of Herco and Unique but settled on 9.0 for either powder as it seemed to shoot more consistently. OAL is the absolute maximum for my New Vaquero cylinder. (noticably OVER the minimum OAL listed by Alliant for a 250 grain bullet using these powders) These loads are about .1 too long for my ROA 45 Colt R&D cylinder.
IIRC, I'm getting between 900-1K fps out of either load. the 9.5 grain loads were both 1K +. No high pressure signs in my gun, in fact I had sooty cases at 8.5 grains.
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Post by taffin on Oct 14, 2009 13:53:13 GMT -5
No pressure signs in my gun,
??"NO" PRESSURE SIGNS?? ONLY UN-FIRED ROUNDS SHOW NO PRESSURE SIGNS. SURELY YOU MEANT NO "HIGH" PRESSURE SIGNS.
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Post by kings6 on Oct 14, 2009 14:12:58 GMT -5
Touche' JT. You are a sixgunners treasure sir! ;D
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Aggie01
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Posts: 1,780
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Post by Aggie01 on Oct 14, 2009 16:09:46 GMT -5
Touche', indeed. I'll edit it, teacher. Thanks.
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Post by emptyhull on Oct 14, 2009 17:45:14 GMT -5
Judging from what a 260gr jacket bullets pressure is, then I can assume that a 250 gr bullet will be at around Max pressure with 8 grs of Unique. I did notice that with 5, 5.5 and 6 grs of Red Dot (Promo) that my casings were dirty and with the loadings of Unique the cases were substantially cleaner. With the increased pressure the casing forms better to the cylinder wall? Tim
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