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Load info using W296 in my GP100.

This is a discussion on Load info using W296 in my GP100. within the Reloading forums, part of the Firearm Forum category; Hi, I was given a full tub of w296 powder and I want to use it for my ruger GP100 with 6 inch barrel. I ...


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Old May 5th, 2017, 02:39 PM   #1
 
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Load info using W296 in my GP100.

Hi, I was given a full tub of w296 powder and I want to use it for my ruger GP100 with 6 inch barrel. I already reload using ADI Australian powders with great results. I will be using various 158gr projectiles with magnum pistol primers. Can anyone tell me a good start and finish load that you may be using to load .357 in the same or similar revolver? Thnks in advance. Cheers gunna.




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Old May 5th, 2017, 03:11 PM   #2
 
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The GP-100 is a strong revolver and ww296 (AKA H110) is one of the very best powders for magnum loads in .357 mag.

ww296 / H110 doesn't respond well to downloading so most data for that powder is within a fairly tight range and generally close to max loads.

I don't shoot a lot of magnum loads but when I do (sounds like beer commercial) I use ww296. No other powder will match the performance in full magnum loads but 2400 comes close.

I'd have to go pull a manual for the exact data but suffice to say that ww296 is an excellent powder for full magnum loads.
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Old May 5th, 2017, 03:23 PM   #3
 
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A good manual will give you the START and MAX loads. Why trust some unknown person on the web when you can go, at the very least, to Hodgdon site for reloading data?
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Old May 5th, 2017, 03:35 PM   #4
 
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Depending on whether you are using a lead or a jacketed 158 gr bullet in a ,357 magnum load, the Winchester data shows:
14.5 grains of 296 for lead
16.6 grains of 296 for jacketed.
Both loads use a magnum primer.

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Old May 5th, 2017, 04:04 PM   #5
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I agree with Petrol and Powder .... W-296 is my powder of choice for full power 357 magnum loads. Not only does it produce higher velocities than most other powders, it also produces very tight max velocity spreads .... often in the 10 fps range. This gives W-296 a vey high potential for accuracy .... better than any other powder I've tried. There is always a "catch" and with W-296 there are four .... it produces a huge muzzle flash .... about 3 feet long and a foot in diameter. No big deal if you shoot in daylight but at night it is very dramatic! The next "catch" is the amount of powder needed for a normal charge .... about 16 grains in a 357 Mag .... in other words, fewer loads per pound of powder. That's because it is heavily doped with retardant to make it burn slower. W-296 requires a magnum primer because it is hard to ignite .... and even harder when temperatures drop below freezing. Last is the "catch" Petrol and Powder mentioned. This powder has a more narrow load range than most powders. If you reduce powder charges below the suggested minimum, it increases the risk of a squib .... so much so that most reloading manuals post a "DO NOR REDUCE" caution. Max charges are no different than any other powder .... anything above the max listed loads will result in chamber pressures above SAAMI max. If you can deal with these four issues, you will find W-296 or it's twin, H-110 will produce excellent full power results.

The Hornady 10th Ed reloading manual shows a range of 12.4 (1000 fps) to 16gr (1250 fps) for W-296 when using a 158gr Hornady XTP bullet. My benchmark 357 Mag load for many years has been 16gr of W-296. I have test fired this load in many different 357 Mag revolvers and found it to be very accurate in all of them. In fact I would say .... if a 16gr W-296 load with 158gr bullets is NOT accurate in a particular revolver .... there's something wrong with the revolver.

Prior to 1993, SAAMI's chamber pressure was 25% higher than it is now so the current max load is about the same as a starting load was back then. My old 1987 Speer #11 manual shows 15.8gr for a starting load and 17.8gr for a max load of W-296.
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Old May 5th, 2017, 05:19 PM   #6
 
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The Hodgdon web site will give you the information you are looking for. For full house magnum loads it is my go to powder.
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Old May 5th, 2017, 06:30 PM   #7
 
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OK guys, I have to jump in here and ask a question. Keep in mind that I've only been loading for about seven (7) months, and possess only a fraction of the knowledge that most of you have.

Among my very first loads while I was learning, were 357 magnums. At this point I have probably loaded and fired more than a thousand of them. I use Alliant BE-86, which calls for 7.8 grains with a 158 grain jacketed bullet to get 1,075 fps. I don't have a chronograph, so I have to take Alliant's word for it. But I have not had any problems with any of my loads.

The Hornady loading manual calls for 16 grains of WIN296 to get 1,250 fps with same bullet.

My question is, why would I use twice as much powder (and double the cost) for such a minor gain in velocity?

Not trying to start an argument, just trying to get educated.

Thanks,

Pam
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Old May 5th, 2017, 07:22 PM   #8
 
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Thanks for the replies. And I should have mentioned I will be shooting berry's 158gr plated Bullets with a maxed recommend velocity of 1250 fps. And coated lead rnd nose 158gr.
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Old May 5th, 2017, 07:27 PM   #9
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Pampurrs, A couple reasons .... your BE-86 load generate more chamber pressure but less velocity than a magnum load with W-296. .... a lose - lose situation. Why? Most of the wear in a revolver is related to chamber pressure. It will increase endshake and will cause the gun to "shoot loose" with fewer rounds fired. BE-86 IS more cost effective though.

A lot depends on what performance level you want to achieve ..... a good mid-range BE-86 load may be just the ticket for your purposes. I used to hunt with my 357 Blackhawk so I wanted as much velocity as safely possible. I also believe a magnum cartridge should behave like a magnum .... no wimpy stuff, just a huge muzzle flash and a very fast bullet going downrange. The trajectory is much flatter at 1250 fps than at 1075 fps, which increases your effective range. I use momentum as a unit of measurement for power. A 1250 fps load with a 158gr bullet produces a momentum of 28.2 .... a 1075fps load with the same bullet produces a momentum of 24.2 ... about 15% less power. For a self defense load, either would get the job done, however for hunting, you stand a better chance of a one shot kill with a heavier load.

Most people do not "plink" with heavy magnum loads. Instead, they usually find a lighter mid-range load such as your BE-86 load .... way less recoil, equal accuracy but more punishing on the gun. When I shoot targets, chances are I will use light 38 Special loads. They still go bang and make a hole in the target .... plus they are cheap to reload and your gun will last forever. Then there are recoil junkies .... I know this because I used to be one. The bigger the bang, the bigger the smile on my face. Now I'm plum tickled with light 38 Special target loads. Talk about efficient, 3 gr of powder per load will get you over 2300 loads per pound and that even allows for some spillage. Lead wad cutters are about the cheapest bullets you can buy. So if you are into cost savings and still like to hear a bang with low recoil, try some lead wad cutter loads.
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Old May 5th, 2017, 08:15 PM   #10
 
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296 is what I use for full magnum loads with either 125 or 158 Hornady XTP. 125 gives the best show though.
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Old May 5th, 2017, 08:39 PM   #11
 
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Well, everything I've read here reinforces my preference for max load of 2400 behind an XTP bullet.
Not a hunter, but keep some self defense rounds on hand and like to plink once in a while with a big fireball.
As always, it depends on what you want to do with your ammo.
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Old May 6th, 2017, 04:05 AM   #12
 
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Quote:
Originally Posted by gunna1day View Post
Hi, I was given a full tub of w296 powder and I want to use it for my ruger GP100 with 6 inch barrel. I already reload using ADI Australian powders with great results. I will be using various 158gr projectiles with magnum pistol primers. Can anyone tell me a good start and finish load that you may be using to load .357 in the same or similar revolver? Thnks in advance. Cheers gunna.
The catch is the bullet. If you are trying to use lead with W296, the powder company data will not support that. You would have to rely on some internet lore about rules of extrapolation.
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Old May 6th, 2017, 04:16 AM   #13
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at liberty, I don't know where you came up with that stuff .....W-296 works equally well with lead bullets. I used to load Berry's hard cast lead (copper plated) 158gr bullets with 15gr of W-296. Very accurate and virtually no bore fouling.
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Old May 6th, 2017, 04:44 AM   #14
 
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I also use W296 over 158 gr cast Keith style boolet in my Blackhawk and my son's GP.
Go to your manuals, work up slowly
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Old May 6th, 2017, 06:27 AM   #15
 
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Quote:
Originally Posted by Iowegan View Post
at liberty, I don't know where you came up with that stuff .....W-296 works equally well with lead bullets. I used to load Berry's hard cast lead (copper plated) 158gr bullets with 15gr of W-296. Very accurate and virtually no bore fouling.
Does Western or Hodgdon provide load data for W296/H110 with lead bullets? Sure there is other data out there, but less formal mostly.
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