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Old 02-04-2014, 11:53 PM   #1
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Default I have a .357 ammo question

I just bought my first revolver, a Ruger GP100 Match Champion. Today was the first time I fired it. I ran 50 rounds of 130 gr 38 Special through it and it shot fine. I then moved up to 158 gr .357 Magnum . This had much more punch, which I expected. They I went back to 158 gr 38 Special. This seemed to have recoil in between the two.
Why would 158 gr 38 Special be so much different then 158 gr .357 magnum?



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Old 02-04-2014, 11:56 PM   #2
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In a word- speed. That .357 is traveling a lot faster. Energy equals speed squared times mass.

38 Special, about 770 fps. 357 mag, about 1240 FPS. Double the energy



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Old 02-04-2014, 11:58 PM   #3
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Quote:
Originally Posted by Bluestar99 View Post
I just bought my first revolver, a Ruger GP100 Match Champion. Today was the first time I fired it. I ran 50 rounds of 130 gr 38 Special through it and it shot fine. I then moved up to 158 gr .357 Magnum . This had much more punch, which I expected. They I went back to 158 gr 38 Special. This seemed to have recoil in between the two.
Why would 158 gr 38 Special be so much different then 158 gr .357 magnum?
Less powder = less pressure = lower felt recoil (if same gun is used for the comparison). The 38 spl cartridge contains less powder than the 357 mag cartridge.
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Old 02-05-2014, 12:06 AM   #4
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Physics. For every action there is an equal and opposite reaction. It takes less force to move a 130 gr. object than a 158 gr. object, the added force necessary to initiate the movement of the heavier object results in added felt recoil.

Oops, I misread the question, but that's why there would be more recoil from a 158 gr. .38 spl. round than a 130 gr. .38 spl. round.

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Old 02-05-2014, 12:10 AM   #5
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Quote:
Originally Posted by Bluestar99 View Post
I just bought my first revolver, a Ruger GP100 Match Champion. Today was the first time I fired it. I ran 50 rounds of 130 gr 38 Special through it and it shot fine. I then moved up to 158 gr .357 Magnum . This had much more punch, which I expected. They I went back to 158 gr 38 Special. This seemed to have recoil in between the two.
Why would 158 gr 38 Special be so much different then 158 gr .357 magnum?
The 357 cartridge has more powder in it.
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Old 02-05-2014, 12:18 AM   #6
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I shot both 130 gr and 158gr in 38 Special. I could feel the difference between them. Then I shot 158 gr .357 magnum. There was a big difference between the 2 158gr recoils. Why do they not have the same recoil if they are both 158gr?

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Old 02-05-2014, 12:20 AM   #7
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He asked why the 158 gr .38s and the 158 gr .357 felt different. He wanted to know why two bullets of the same weight felt different, not why the magnum cartridge kicked harder than the .38. As some other stated, the .357 has a slightly longer case and more powder. It's like a .38 special on steroids. More powder means bigger boom to put it in lamens terms.

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Old 02-05-2014, 12:21 AM   #8
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Quote:
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The 357 cartridge has more powder in it.






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He asked why the 158 gr .38s and the 158 gr .357 felt different. He wanted to know why two bullets of the same weight felt different, not why the magnum cartridge kicked harder than the .38. As some other stated, the .357 has a slightly longer case and more powder. It's like a .38 special on steroids. More powder means bigger boom to put it in lamens terms.

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Old 02-05-2014, 12:21 AM   #9
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.357 magnum requires a "hotter" powder charge

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Old 02-05-2014, 12:22 AM   #10
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The 158 gr weight listed on the load only applies to the weight of the bullet (projectile) and does not include the weight of the powder charge.

So a 158gr .38 Special load may contain 5.0 gr of brand x powder, while the .357 mag 158gr load may contain 6.5 gr if the same powder, resulting in more overall energy. That energy results in higher velocity of the same weight of projectile. That energy difference is also going to be felt in the recoil and whatever the projectile strikes as well.



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