Twin Ruger GP100s Range Report

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GunAdmirer

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Twin Ruger GP100s Range Report - Updated

Updated - See informal chronograph results further down in the thread!

I went to Red's Indoor Range North in Pflugerville (Austin), Texas tonight to shoot and compare a couple of used 4" and 6" full lug stainless Ruger GP100s I acquired over the last 18 months. Their story is kinda interesting - see below.

I shot the following ammunition:
29 - Sellior & Bellot 158 grain .357 Magnum soft point semi jacketed rounds
25 - Federal Classic 158 gr .357 semi wadcutter lead cast rounds
50 - Ultramax 158 gr .38 Special semi wadcutter cast rounds
8 - Winchester 180 gr. .357 Mangum partitioned hunting rounds

I started out shooting two of each type of rounds in each revolver's cylinder to compare the recoil between the rounds. Then I shot alternating rounds from each to see if I could discern any real differences between the two revolvers. After a few cylinders, I just shot the different rounds for accuracy and fun.

Results: The Revolvers
The 6" was slightly front muzzle heavy. The 4" was well balanced. Both were very accurate. I could not determine any real differences in handling recoil or accuracy. I shot both of them equally well, although the 4" felt better to handle. The 6" has a slightly better trigger pull. I thoroughly enjoyed shooting them both, although I think I would keep the 4" if I had to part with one. I plan to do some dry firing and install the Wolff reduced power springs to smooth and even the trigger pulls a little. The 6" could not be improved much in single action but has a heavy double action pull. The lighting wasn't very good at the indoor range, so the fiber optic sight wasn't very bright.

Results: The Ammo
The Ultramax "remanufactured" .38 Special rounds were REALLY dirty and smoky. The stainless revolvers were filthy from them, but they were accurate. The recoil was very mild in the heavy guns. All the .357 Magnum rounds were clean and potent! The recoil was stout but manageable. I could not discern any real difference in recoil between the 158 and 180 grain .357 Magnum rounds. I don't shoot consistently well, so it would be pointless to give you group sizes. However, I had several groups where several holes were all touching each other. All of the rounds were more accurate than the shooter could produce.

History of the "Twins":
About a year and a half ago I rescued the stainless 4" Ruger GP100 from a local pawn shop. It was pretty dirty but sound. I paid about $315.00 for it. I throughly cleaned it inside and out with lead removal cloths and Flitz and put a new Hogue grip and Marble's green fiber optic front sight on it. I was amazed at how well it cleaned up and shot. It became a favorite.

A week ago I found a stainless 6" GP100 at the same store in the same condition. I debated back and fourth for several days. After all, I already had a 4" just like it. I couldn't resist. This time I paid $300.00. I gave it the same TLC and it also turned out equally nice. Niether looked like it had been shot much.

When I checked the serial numbers at Ruger's website I was pleasantly surprised to learn that they were manufactured the same year (1989) and the serial numbers were less than 5,000 apart! Since I had seen several Ruger revolvers over the last couple of years, I asked the pawn shop manager if there was a local Ruger collector that was selling off his stuff. He said it was just a coincidence.

I really like them both. They are strong, accurate and inexpensive. I think they look sharp too. I also like the fact that I do not have to worry about the full magnum loads wearing them out. I will post pictures soon.
 
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I owned one of the stainless GP100 4 inch models back in the late 80's. A hell of great shooter - should have never traded it! :cuss: A guy at the local range offered to sell me his mint 6". If it were a 4 I would snatch it up. I have 6 " Smith at the moment.
 
Your choice of ammo is not mine, but my four-inch GP-100 is very smooth and accurate. I bought this one last year; previously had another.

I normally use Hornady 140 grain .357 JHP or Federal Hydra-Shok 158 grain JHP's. These shoot well, and have the ability to penetrate well on a heavy man or an alligator, my two most likely animate targets. They will, of course, suffice for wild dogs and would kill a black bear or cougar, too. And they don't lead the barrel like ytour Federal classic lead bullet!

The GP-100 is a good gun. I wear it in the same situations where I otherwise wear my S&W M66. I take comfort in knowing that the Ruger will endure more use of magnum ammo without shooting loose, too, and feed them accordingly.

Lone Star
 
Ammo Choice

The ammunition I used was only what I had available and cheap at the time. I would certainly use different ammo for personal defense and more serious testing and range use. The Winchester Partition Gold 180 grain bullet I shot seems to be the best .357 design out for hunting right now.
 
Chronograph Results

A friend and I took his chronograph to our private range and compared the results between the 6" and 4" revolvers. We didn't have much time to fire enough rounds to make a reliable conclusion, but it was fun and the results are interesting. It appears that the convention wisdom that the extra 2" of barrel produces an extra 60-100 fps is true.

Federal Classic .357 158 gr. swc: 6" 1246 avg fps, 4" 1171 avg fps (75 fps difference)
Sellior & Bellot .357 158 gr. sjfp: 6" 1170 avg fps, 4" 1140 avg fps (30 fps difference)
Corbon .357 125 gr. jhp: 6" 1562 fps!, 4" 1444 fps (118 fps difference, 1450 fps stated on box)
Winchester 38 sp +p 130 gr. SXT jhp: 4" 1026 fps

By the way, barrel leading has not been a problem in either gun.
 
Reloading

I just got the handloading bug. I am going to have to see what the twins can do.

By the way, Millett makes nice orange and white bar front sights for the Ruger GP100s. I think the white bar would be best for low light conditions. They are nicely made and better countoured for holstering and use than the factory sights. I really like the fact that I can change out sights quickly and easily and have several options.

Here's a picture of the 6 inch with Hogue grip and Millet front white bar sight.
 

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Shot my GP100 6" for the first time last weekend.

Best 5 shot group at 25 yards was 3.5" unsupported. I think the gun and I can do better than that so I"m going to try again Saturday. ;)

That's with Fiocchi 142gr FMJ ammo.

I currently own 3 GP100s. My first gun, a 4"; the 6" that's the topic of this post; and one of the LEO DAO models--probably an RCMP issue. I'll probably sell the DAO one of these days.

BTW, just before I read this thread, I had made the decision to put one of the Hogue Monogrips on the 6" and maybe on the others if it worked out well.
 
GunAdmireer, did you put some Wolff springs in those GPs yet? If so, how do you like them? I should find out for myself as soon as the ones I bought from you get to me.

Did you chrono the 180gr Winchester Supreme Partitions?
I was curious how fast they come out of the 6" GPs because I have heard numerous people say Rugers "shoot fast" compared to others.
 
I have not installed the springs or chrono'd the 180 grain Winchesters yet. I have read that the reduced springs REALLY improve the trigger pull on Rugers. I just haven't had the time. I plan to really test the Winchesters on a nice feral hog in a couple of weeks - if I don't develop my own load in time.
 
I just put in one of the orange Millet front sights on my 6" GP100. It is MUCH easier to see and get a good sight picture than with the black on black factory front sight. I've only dry-fire practiced so far, so no actual experience with it yet. They're fairly inexpensive and replacement takes less than a minute. We'll see how it goes.
 
Shot my 6" GP100 some more today. Same Fiocchi ammo as above, same 25 yard range, but I did 10 shot groups today.

The best one was 3.75"

The last group was a real heartbreaker--9 out of the 10 rounds went into 2.6"--the tenth shot more than doubled the group size to 5.5" :banghead:
 
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