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OM Blackhawk hitting high

This is a discussion on OM Blackhawk hitting high within the Ruger Single Action forums, part of the Pistol & Revolver Forum category; I've got a 3-screw .357 Blackhawk with a 4-5/8" barrel. I typically load 158 gr. jacketed bullets for most of my .357s, and my usual ...


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Old February 1st, 2020, 05:35 PM   #1
 
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OM Blackhawk hitting high

I've got a 3-screw .357 Blackhawk with a 4-5/8" barrel. I typically load 158 gr. jacketed bullets for most of my .357s, and my usual load does right at 1100 fps. from this revolver. Unfortunately, it tends to throw them about 10" high at 25 yards, and that's with the rear sight bottomed out.

It's an Old Model, so the front sight is either soldered on, or otherwise permanently installed. Replacing the front sight wouldn't be as easy as with a New Model where I could just remove a screw and replace the sight.

So I'm thinking I should try a lighter bullet. Think a 125 gr. bullet will do any better with regard to a lower POI? Anyone else run into this before?



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Old February 1st, 2020, 05:45 PM   #2
 
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New model blackhawks also have a soldered on front sight. The exception would be a stainless steel new model which has a pin in blade. New model single sixes have a screw on front sight.

In addition to a lighter bullet, a faster load will also bring down the point of impact.
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Old February 1st, 2020, 05:59 PM   #3
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I think your grip has some effect. As I will often shoot to a different POI from someone else.

Generally, the longer a bullet stays in the barrel, the higher the impact. Speeding it up, with more powder or a lighter bullet, may help.
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Old February 1st, 2020, 06:10 PM   #4
 
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Can OP file down the rear sight blade or have someone do that?
Might end up with a rather shallow rear notch, but the notch can usually be deepened.
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Old February 1st, 2020, 06:50 PM   #5
 
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Call Ruger, they offer different heights of rear blades, you need a lower one.
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Old February 2nd, 2020, 06:19 PM   #6
 
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Quote:
Originally Posted by Gearhead Jim View Post
Can OP file down the rear sight blade or have someone do that?
Might end up with a rather shallow rear notch, but the notch can usually be deepened.
Quote:
Originally Posted by wkuban View Post
Call Ruger, they offer different heights of rear blades, you need a lower one.
Yeah, I thought about that, but itís fairly shallow already. Shortening the rear sight blade will make it almost not a sight at all.

I loaded some 125 gr. ammo last night. Need to get out and put it on paper.
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Old February 3rd, 2020, 08:26 AM   #7
 
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Have you tried any 140 gr. bullets?

WYT-P
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