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Magnum small pistol primers vs. standard
 Moderated by: Slingshot, OldStuffer, klallen
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 Posted: Wed Sep 29th, 2010 04:09 PM
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VS3421
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Joined: Tue Sep 28th, 2010
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I made a mistake when I bought some small pistol primers to load 9MM.  I picked up a box of magnum when I ment to get standard primers.  My question: I have been loading 145 gr. projectiles (because I have some and I'd like to use them up), using 4.0 gr. of Unique powder.  Do I need to reduce this powder load to use these magnum primers in a Walther P-38 or Walther P-99? Should I change to a different pistol powder?





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Bruce Jordan



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 Posted: Thu Sep 30th, 2010 02:41 AM
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fryboy
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umm u should buy a magnum pistol to go with'em !!!!!!! erm all kidding aside , i didnt look up ur load but every reloading manual i'd open would state that anytime u change a component ( or lot #'s ) that u should reduce ur load and work ur way safely back up , i'm real fond of the slower pistol powders with the heavier projectiles per caliber sometimes there magnums actually help and sometimes it can also hurt the accuracy , i kinda replied a bit on this in ur hello thread but basically if u follow that one lil caveat it will help keep u out of trouble ,when u state projectiles it could be either jacketed or cast/swaged , some manufacturers give different data for them and some dont (most do) ,if cast boolits i've found one usually needs less powder opposed to jacketed as the boolits dont create as much friction in the bore as the bullets do



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 Posted: Thu Sep 30th, 2010 03:46 PM
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TMan51
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Joined: Thu Feb 25th, 2010
Location: Hillsborough, New Jersey USA
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VS3421 wrote: I made a mistake when I bought some small pistol primers to load 9MM. 
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Bruce Jordan


Bruce, I've loaded for several 9mm's over the years and in that time I've come to feel that it's one of the more challenging cartridges to load for.  Several reasons for that.

Brass is highly variable in both weight and hardness.

Operating pressures are very high for a handgun round.

The case volume to powder volume ratio require very precision charge weights.

Bullet seating depth and COAL is absolutely critical. 

The real answer in my mind is that not one of the eleven loading manuals I own has even one 9mm load with a magnum primer.  My experience using them in a .357BH, a tank of a revolver, is that a straight swap from brand to brand can make a noticable difference, and from standard to magnum can make a huge difference.  My guess is that even starting loads might be a risk with some powders/brass/bullets.



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 Posted: Fri Oct 1st, 2010 02:30 AM
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Reloader06
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The above is GREAT advice. As far as your situation, do you know someone you trust that you could trade with? It's just not worth the risk of wearing parts of your pistol. YMMV

Matt



 Posted: Sun Aug 7th, 2011 02:04 AM
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jjb2
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i need to reload some .38 spls.     what have to use is magnum primers and either red dot or bullseye......    with are your thoughts on this??        thanks..     jjb

 

 PRAY FOR OBAMA...     PSALMS 109:8



 Posted: Sun Aug 7th, 2011 02:09 AM
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fryboy
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a waste of mag primers as both powders you listed have no need for them and i'd opt for the bullseye first , my fav 38 loads use 700x but many other powders works great in it , top listed loads should also be approached carefully as the mag primer tends to raise pressure levels



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 Posted: Sun Aug 7th, 2011 10:47 AM
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TMan51
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jjb2 wrote: i need to reload some .38 spls.     what have to use is magnum primers and either red dot or bullseye......    with are your thoughts on this??        thanks..    

What .38 are you loading for?  If you're shooting them in your .357 Mag for practice, load away.

If you have a legacy M36, or something like a Charter Arms, you are on your own, as nobody lists such a load, and both powders can be responsive to things like primer intensity based on my own experience with WLP's and Red Dot in my .44/SBH.



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 Posted: Tue Aug 9th, 2011 06:23 AM
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jjb2
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these would be reloads for my bro-in law but all i have is small pistol magnum primers....        i use almost all bullseye but i got a good buy on some red dot an couldn't pass it up...         looks like most of recipes are for a close fps and pressure from either powder.... loads will be 3.2 grs bullseye with a homecast 150gr. lead swc in .38 spl cases......   the revolver is a colt trooper mkIII and i shoot a s&w mod 27-2....     the smith likes that load real well so i hope the colt with the tapered rifleing likes em too..........................  still not settled on the red dot load load though...... 

 

  IMPEACH OBAMA.... STRIKE THAT..  ARREST OBAMA...............................................



 Posted: Tue Aug 9th, 2011 04:15 PM
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TMan51
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The Trooper and the 27-2 will eat pertty much any .38 load, with any primer you have in stock.

I'd be careful handing out ammo though, if you load at the high end of the charge wt range.



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 Posted: Tue Aug 9th, 2011 06:57 PM
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Ranch 13
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Cut your load 10% and start from there. Pretty good chance you won't notice any difference, but when in doubt it's always best to start low and work up.



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