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Fiocchi Ammo .38 Special

This is a discussion on Fiocchi Ammo .38 Special within the Ammo Dump forums, part of the Firearm Forum category; Took my LCR and my SP101 to the range today and went thru a box of Fiocchi FMJ 158 grain. I was shooting consistently high ...


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Old January 24th, 2017, 03:25 PM   #1
 
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Fiocchi Ammo .38 Special

Took my LCR and my SP101 to the range today and went thru a box of Fiocchi FMJ 158 grain. I was shooting consistently high with this as compared to Winchester SJHP 130 grain...Has anyone else noticed this?



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Old January 24th, 2017, 03:33 PM   #2
 
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Bullet weight always has a significant role in a revolver's point of impact. As a rule,
lighter bullets strike low and heavier bullets strike higher.

It's a function of recoil and the time the bullet is in the barrel. The lighter bullet will exit the barrel before the barrel rises much in recoil. The slower, heavier bullet will remain in the barrel slightly longer and therefore exit the barrel later during the recoil. It's milliseconds but it matters.

Last edited by Petrol and Powder; January 24th, 2017 at 03:38 PM.
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Old January 24th, 2017, 03:38 PM   #3
 
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Quote:
Originally Posted by Petrol and Powder View Post
Bullet weight always has a significant role in a revolver's point of impact. As a rule,
lighter bullets strike low and heavier bullets strike higher.

It's a function of recoil and the time the bullet is in the barrel. The lighter bullet will exit the barrel before the barrel rises much in recoil. The slower, heavier bullet will remain in the barrel slightly longer and there fore exit the barrel later during the recoil. It's milliseconds but it matters.
That explains it. Last time out I was shooting the 130 grain +P's. When I started aiming 4" lower, I was back on target. Thanks for the help.
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Old January 24th, 2017, 03:59 PM   #4
 
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That explains it. Last time out I was shooting the 130 grain +P's. When I started aiming 4" lower, I was back on target. Thanks for the help.
If you have access to: "Textbook of Pistols and Revolvers -Their Ammunition, Ballistics and Use" by Major Julian S. Hatcher, copyright 1935; he explains it thoroughly in Chapter 8 on Interior Ballistics.
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Old January 24th, 2017, 04:08 PM   #5
 
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Quote:
Originally Posted by Petrol and Powder View Post
If you have access to: "Textbook of Pistols and Revolvers -Their Ammunition, Ballistics and Use" by Major Julian S. Hatcher, copyright 1935; he explains it thoroughly in Chapter 8 on Interior Ballistics.
I don't...but it sounds like an interesting read so I ordered it. It should be downloading as I type this.
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Old January 24th, 2017, 05:45 PM   #6
 
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At what distance? At defensive distances, 4" sounds like a lot to attribute to bullet weight.
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Old January 24th, 2017, 05:50 PM   #7
 
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At what distance? At defensive distances, 4" sounds like a lot to attribute to bullet weight.
15 feet.
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Old January 24th, 2017, 06:29 PM   #8
 
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I read and re-read the section on recoil... accordingly it affects a .38 special 158 grain by a factor of .20. So in 15' that equates to 3".. now we have to factor in LCR gun weight against the weight of of the revolver used as the benchmark. Yep...I'm going along with recoil.
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Old January 25th, 2017, 03:47 PM   #9
 
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I'm not saying you're wrong - you experienced what you experienced. That just sounds like an awful lot of difference at 5 yards. I've been shooting 125 and 130gr from my LCR357. I'm gonna have to try at least a cylinder of 158 next time just to see what happens.
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Old January 25th, 2017, 03:59 PM   #10
 
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mine always shot to point of aim compared to the same bullet weight from another manufacturer.
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Old January 25th, 2017, 04:46 PM   #11
 
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I'm not saying you're wrong - you experienced what you experienced. That just sounds like an awful lot of difference at 5 yards. I've been shooting 125 and 130gr from my LCR357. I'm gonna have to try at least a cylinder of 158 next time just to see what happens.
Most revolvers chambered in 38 Special and equipped with fixed sights have the sights regulated for 158 grain bullets.

The report from the OP is right in line with what revolver shooters have known for well over century. Bullet weight affects bullet impact.


I've been shooting 38 Special for longer than a lot of members of this forum have been alive and the OP's experience doesn't seem unusual to me in the slightest. Major Julian Hatcher documented the effect back in 1935. Major Hatcher knew more about handguns than I could ever hope to learn.

If you need convincing, by all means get some 158 grain bullets and try it for yourself.

Last edited by Petrol and Powder; January 25th, 2017 at 06:34 PM.
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