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sp101 .357 3" barrel loads

This is a discussion on sp101 .357 3" barrel loads within the Reloading forums, part of the Firearm Forum category; I have a wonderful sp101 .357 with a 3 inch barrel. As I have learned alot of the powder does not burn in snubbie .357 ...


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Old December 4th, 2010, 11:34 AM   #1
 
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sp101 .357 3" barrel loads

I have a wonderful sp101 .357 with a 3 inch barrel. As I have learned alot of the powder does not burn in snubbie .357 barrels. Correct me if I am wrong. Anyway does anyone have some good efficient loads for an my type of gun.

Thank you



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Old December 4th, 2010, 11:36 AM   #2
 
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Ooops my bad. I have learned that powder does not burn good in short snubbie barrels. I was wondering about the 3 inch barrel and what efficient loads someone may have developed for the sp101.

Thank you again
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Old December 4th, 2010, 03:11 PM   #3
 
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teched08 - I use the same loads for both my wife's SP101 and my GP100 with 125 gr. FMJ, JSP or JHP bullets, and they work fine in both guns. Here they are:

.38 Special - 4.5 gr. of Alliant Bullseye

.357 Magnum - 7.2 gr. of Hodgdon Titegroup or 10.5 gr. of Alliant Power Pistol
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Old December 4th, 2010, 04:59 PM   #4
 
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I am running 4.2 grains of Bullseye under a 158Gr LSWC,seems to work good in my SP101 and Taurus 627 Tracker
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Old December 5th, 2010, 04:40 AM   #5
 
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I have read in other forums that shooting 125gr rounds are fine in .38 but shouldn't be used in .357. I have both and does anyone have any ideas on the the use of 125gr in a .357?
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Old December 5th, 2010, 05:24 AM   #6
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I like Power Pistol for shorter BBL loads. It gives good energy, is clean burning and burns pretty completely in short BBL's. Give it a try.
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Old December 5th, 2010, 06:17 AM   #7
 
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Quote:
Originally Posted by jlynch34 View Post
I have read in other forums that shooting 125gr rounds are fine in .38 but shouldn't be used in .357. I have both and does anyone have any ideas on the the use of 125gr in a .357?
According to the Speer #14 reloading manual, using 125 gr. jacketed bullets for .357 Magnum is fine.
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Old December 5th, 2010, 02:29 PM   #8
 
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One of my "funnest" loads for my .357 is with a 125 gr JHP over around 9 gr. Unique...
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Old December 5th, 2010, 02:35 PM   #9
 
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Quote:
Originally Posted by reloader38 View Post
According to the Speer #14 reloading manual, using 125 gr. jacketed bullets for .357 Magnum is fine.
I think what the OP has heard is that hot 125 grain .357 loads erode the barrel throat on S&W K-frame revolvers, where the bottom of the barrel is milled flat. The barrel may crack there. The erosion from these hot loads and the unburned powder (that would burn with heavier bullets) erodes the barrel throat more. The problem is worst if the barrel throat isn't kept clean of lead residue, which increases pressures.

For best velocity eficiency and balance in a three-inch barrel, look at the `140-145 grain bullets. Expect about 1200 FPS, which is a pretty stiff load in these small guns. But they do provide that power in a compact package. And most needs can be met with .38 Special ammo in them. Still, if I was hiking in cougar country, I'd load .357 ammo.

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Last edited by Lone Star; December 5th, 2010 at 02:45 PM.
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Old December 5th, 2010, 05:43 PM   #10
 
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Short barrel calls for heavy bullet

As a rule of thumb, a short barrel calls for a heavy bullet. The time, the bullet is in the barrel augments with its weight. Thus you will get more energy with a heavy bullet at a given length of the barrel.

Question is, wether the bullet will travel fast enough - independent of the energy - to function properly at the target.

Me, I did opt for a 180grs Remington SJHP before 6.5grs of Longshot. Meters at 922fps in my 1 7/8" S&W J-Frame. Hence it is subsonic and quite fast.

As a means of comparison: A still usable load of 7.0grs metered at 979fps. Out of an average 6" gun this load of Longshot will yield about 1.030fps (this time not my metering). Evident, compared to my pet load for my 6" GP100, the very same 180grs Remington SJHP before 15grs of Lilgun, which meters at a little below 1.300fps, this is a net loss in performance.

Anyway looks good.

BTW, Titegroup, loaded within the limits of what Hodgdon publishes, will burn in the 1 7/8" barrel.

Fritz
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Old March 30th, 2011, 02:16 PM   #11
 
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I have some 125's loaded up with 22 grains of H110 sitting on CCI Small Pistol Magnum Primers...
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Old March 30th, 2011, 03:09 PM   #12
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I think the 125 grain bullets are fine, in fact, I think that was the mainstream bullet weight for that caliber for enforcement loads. I HAVE heard that hot 110 grain bullets would cause damage over time....
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Old March 30th, 2011, 03:24 PM   #13
 
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I run cast 125 grain boolets over 8.5 grains of Unique, .357 cases. Not a bad little round IMO.
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Old March 30th, 2011, 03:36 PM   #14
 
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I don't want to misquote Iowegan, but i believe i recall him talking about flamecutting in the SP101 with low grain bullets. If I remember correctly, he reccomends a minimum of 125 gr bullets to cut down on the flamecutting. Bigger is better. As for powder, i do not know. Please correct me if i am wrong here!
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Old March 30th, 2011, 03:45 PM   #15
 
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Quote:
Originally Posted by Lone Star View Post
I think what the OP has heard is that hot 125 grain .357 loads erode the barrel throat on S&W K-frame revolvers, where the bottom of the barrel is milled flat. The barrel may crack there. The erosion from these hot loads and the unburned powder (that would burn with heavier bullets) erodes the barrel throat more. The problem is worst if the barrel throat isn't kept clean of lead residue, which increases pressures.

For best velocity eficiency and balance in a three-inch barrel, look at the `140-145 grain bullets. Expect about 1200 FPS, which is a pretty stiff load in these small guns. But they do provide that power in a compact package. And most needs can be met with .38 Special ammo in them. Still, if I was hiking in cougar country, I'd load .357 ammo.

Lone Star
To my eye, the SP-101 has the bottom of its forcing cone milled a touch flat on the bottom as well. Not as much but it's there...
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