145 gr Silvertip for 357


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Byron
January 1, 2008, 10:16 AM
I have a box of the 145 grain Silvertips.Will the aluminium jacket increase the pressure on the catridge when reloaded using data from the Speer manuals for their 145 grain bullet? I would like to load at or under factory specs. I have Olin 296,IMR 4227 and AA #7 for reloading. Thanks, Byron

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scrat
January 1, 2008, 12:10 PM
nope pressure should be the same. the powder does not know the difference.

steveno
January 1, 2008, 04:07 PM
the jacket material is silver plated copper(?) jacket material. I think the only aluminum Winchester used as jacket material was on the 45 acp

Steve C
January 1, 2008, 09:24 PM
I had some 110gr +P Silver tip HP's that where aluminum jacketed but that was factory ammo.

Like with any change in component you should use the start load or 10% reduction from the maximum load for the weight of bullet (though 145gr is a bit of an odd ball) and work up. Personally I'd split the difference between the 140gr and 158gr bullet data found in most of the load manuals like Speer, Hornady or Siera to work up a load.

Byron
January 2, 2008, 10:29 AM
I apprecite y'alls help.I'll start working the load up next week. Thanks, Byron

Mark whiz
January 2, 2008, 11:21 PM
Bryon,
I like those 145gr Silvertips for carry loads - they work very well.

I haven't had the greatest of luck (accuracy wise) with Win 296 with them, but in my 4" Security six, either 6.6gr of Win 231 or 8.8gr of AA#5 works really well.

ArchAngelCD
January 3, 2008, 10:23 PM
I'm a big fan of W296/H110 but with those Silvertip bullets I've found HS-6 to be the most accurate. IMR4227 is a bit more accurate with those bullets than W296 and since you already have that powder I would give that a try too.

MikeG
January 4, 2008, 12:28 AM
Lyman's manuals - 47, 48 and pistol and revolver 3rd edition have data for the Winchester 145 Silvertip. There's no need to extrapolate from Speer's data.

rodregier
January 4, 2008, 11:11 PM
I read years ago that the factory Silvertip loadings w/aluminum jackets has a special lube on the projectile (inside the case mouth). I think the .380 loadings also used the aluminum jackets.

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