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new 6" GP100.... ammo question

This is a discussion on new 6" GP100.... ammo question within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; I just bought a new 6" blued GP100 (first revolver) and am currently gathering up some ammo to go test it out Judging from some ...


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Old March 24th, 2013, 01:02 PM   #1
 
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new 6" GP100.... ammo question

I just bought a new 6" blued GP100 (first revolver) and am currently gathering up some ammo to go test it out

Judging from some research, it seems that the gun is sighted in for 158 grain 357 mag ammunition from the factory. How far "off" should I expect 130 grain 38 special loads be at, say, 15 yards? What about 125 grain 357 mag?

I plan on shooting 158 grain 38 special the most out of the gun once I start reloading my rounds.... so for long term, I don't want to mess with the factory sight-in. I'd just like to know about how far off my POI should be in elevation. Are we talking 1", of more like 3" or 4"? I'm not sure just HOW big of a difference grain makes at such small yardage




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Old March 24th, 2013, 01:37 PM   #2
 
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I have no problems with 125gr .357. Can shoot the whole cylinder into 1" on the bulls-eye at 15 yds. I also shoot 158 grain .38s with great accuracy as well.

Mine is a 4.2" GP100.
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Old March 24th, 2013, 01:57 PM   #3
 
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Do yourself a BIG favor, as I do, and NEVER use .38 Special cases in it. Instead, use .357 mag cases ONLY and use whatever loads you want, whether they are .38 spl or .357 mag. That way, you eliminate the possibility of the "dreaded" ring caused by firing .38's in your .357. The .357 is about .120" inch longer than a .38 spl., and using the shorter cases could theoretically cause that powder ring in your cylinder. If you use the .357 mag cases, you eliminate the ring because the cylinder was made to accomodate the longer .357 case. This all assumes one will do their own reloading, which is 'way cheaper and more controllable. Since there is no semi-auto ejection situation, reusing one's brass is super-simple.
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Old March 24th, 2013, 02:25 PM   #4
 
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you can easily remove the powder ring in your cylinders with a brass brush when you are done firing .38 spc. and then shoot all the .357 you want.people have been doing that for decades.the "ring" is only carbon deposits.
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Old March 24th, 2013, 09:15 PM   #5
 
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Quote:
Originally Posted by blackvoid View Post
Do yourself a BIG favor, as I do, and NEVER use .38 Special cases in it. Instead, use .357 mag cases ONLY and use whatever loads you want, whether they are .38 spl or .357 mag. That way, you eliminate the possibility of the "dreaded" ring caused by firing .38's in your .357. The .357 is about .120" inch longer than a .38 spl., and using the shorter cases could theoretically cause that powder ring in your cylinder. If you use the .357 mag cases, you eliminate the ring because the cylinder was made to accomodate the longer .357 case. This all assumes one will do their own reloading, which is 'way cheaper and more controllable. Since there is no semi-auto ejection situation, reusing one's brass is super-simple.

Or just use a belled out .357 mag case to get rid of that .38 spcl carbon ring. It's really not a big deal either way.
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Old March 24th, 2013, 09:26 PM   #6
 
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Spend some extra money and get the Hoppe's Viper Bore Snake and you'll never have to worry about carbon ring in your cylinder...as long as you clean your gun after every shooting session. I've ran 5000 rds of 38's in my SP 101 357 mag and my cylinders are spotless. Also, you might enjoy reloading 38's with 148 gr wadcutters...those make very nice holes in paper and are very easy to shoot accurately.
Hope this helps.
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Old March 25th, 2013, 12:44 AM   #7
 
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Congrats on the new GP! I've got a regular 3" GP100 .357 mag and a Wiley Clapp edition 3". I've been jonesing for a longer barrel. I probably won't go with 6" but try and find one of the few 5" models hiding out there. Oh, how I wish Ruger would make 5" GP's.
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Old March 25th, 2013, 03:46 AM   #8
 
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Brandi,

Ruger does make a 5", I've got one and I and everyone else that tries it loves it! It is a Davidson's exclusive, and you or you dealer can order it. Once i saw one at the range I had to have it! I picked one up a couple of months ago for $648. (Davidson's also gives a lifetime Gaurantee for any weapon purchased through them for repair or replacement - pretty cool!)

ZoSo- why worry about adjusting you sight? That's what it's for. Once you get it dialed in leave it alone, but until then have at it!

I'm shooting 158gr. SJSP in both .357 and .38, with the magnums dialed in for zero @ 25 yds. ( drop 1.4 at 50yds ). The +P .38 is pretty much dead on (maybe a touch lower), at 25 with a 2.75 drop at 50

I wouldn't worry about carbon rings shooting .38's just clean it when you get home and its good as new. People have been doing it forever, I've shot with guys mixing 38's in their guns for 30 years and their guns are fine. It was part of the reason I got mine, it's like getting 2 guns in one!
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Old March 25th, 2013, 06:50 AM   #9
 
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A 40 S&W boresnake works well on the cylinders, just don't try to pull it through the barrel!
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Old March 25th, 2013, 09:33 AM   #10
 
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Quote:
Originally Posted by Firenailer View Post
ZoSo- why worry about adjusting you sight? That's what it's for. Once you get it dialed in leave it alone, but until then have at it!

I'm shooting 158gr. SJSP in both .357 and .38, with the magnums dialed in for zero @ 25 yds. ( drop 1.4 at 50yds ). The +P .38 is pretty much dead on (maybe a touch lower), at 25 with a 2.75 drop at 50
I didn't want to adjust away from 158 grains because that's what I plan on shooting out of it long term... I just have this particular ammo now because it's all I could find on the shelves. I hate to go through the trouble of sighting in a box of 130 gr 38 and 125 gr 357 only for one box of each, then go right back to the original sight-in for 158.

Just curious how big of a POI change I would expect at like 15 yards... wouldnt imagine much, but I don't really know. Judging from the responses here, I shouldn't expect a heck of a lot.
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Old March 25th, 2013, 09:34 AM   #11
 
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And of course, pics will be necessary once my grips come in.... I hate those Hogues!
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Old March 25th, 2013, 10:50 AM   #12
 
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I'm kind of on the fence with the hogues myself, although I'm getting used to them. what are you changing to?
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Old March 25th, 2013, 01:29 PM   #13
 
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I'm getting rubber/wood-insert grips from Altamont, who made the original style grips for the GP100. The stock Hogues are waaayyy to thin for me. I have to fumble around for a minute to get a proper grip on them. They just don't work for my hands

The rubber grip will have "snakeskin" patterning, and I'm getting smooth silver/black wooden inserts. Ought to look pretty sharp on a blued model
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Old March 25th, 2013, 06:12 PM   #14
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Quote:
Originally Posted by bobmare View Post
you can easily remove the powder ring in your cylinders with a brass brush when you are done firing .38 spc. and then shoot all the .357 you want.people have been doing that for decades.the "ring" is only carbon deposits.
QFT. I have been shooting noting but +P in my 4 inch GP. And after each session I use various brushes to clean it. When I'm done it's clean as new. Sometimes you can't use .357 at a range. Does that mean you don't shoot that gun? I think not. If you have a good cleaning regimen after using any gun, this shouldn't be a problem. OTOH if you don't clean you get problems.
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Old March 26th, 2013, 11:41 AM   #15
 
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Choose the ammunition that works best ballistically/terminal performance-wise for the function that you're using your GP100 for. Then zero the sights-zeroing sets the gun's sights accommodating both you (your unique physique/index) and the cartridge's performance at the range desired, to achieve an identical Point of Aim/Point of Impact (POA/POI).

The factory setting my be a convenient place to start-but it's up to you to verify and finalize to your specifics. That's one of the advantages of having an adjustable-sight gun; with a fixed sight gun, its often a file/and or gunsmithing kinda day...

Most Rugers, in my experience, have factory settings for the GP100s set primarily for a six-o-clock POA for a center-of-target POI with 158gr .357 ammunition (or 158 gr .38 Special if the GP is chambered specifically for .38 Special); for defensive use, I much prefer a center-hold POA/POI-I think that it's much more instinctive. Target shooters may prefer the six-o-clock hold.

Best, Jon
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