accuracy went south

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  • Last Post 19 October 2019
2frogs posted this 16 October 2019

Ok before I get to far into this my bullet was 240 gr

Hornady.. With a load of imr 4227..At 50 yards I was doing

real good..Like 3 inch gropus..Revolver Taurus 44  6.5 inch

barrel..Solid rest..Loaded 10 more this morning and accuracy was

all over..I wounder if my fastfire 3 sight went bad?

Any ideas why this was??

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M3 Mitch posted this 16 October 2019

Well, if you can see the iron sights well enough, pull the optic off and see how it shoots without it, if it shoots better, you know the optic is at fault.  Check the mounting screws on your optic, loose mounting screws are a very common cause of wild shooting.

You are shooting a Hornady 240 grain swaged lead or jacketed bullet?  If the former, it's possible they are undersized for your gat, and you have leading.

That's all I can think of right now.

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2frogs posted this 16 October 2019

Should have said the barrel was just cleaned and with the optic sight the iron sights are removed..And this is new brass

if it makes any difference...Think I am going to try a few loads with unique this time

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Ken Campbell Iowa posted this 16 October 2019

... this reminds  me of when i carefully mounted a $25 tasco red dot on a friends 3 inch 12 ga. deer slug gun ... 1 shot later,  $25 shot to heck ... heh ... ken

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mashburn posted this 17 October 2019

Amen to that post Ken.

Mashburn

David a. Cogburn

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2frogs posted this 17 October 2019

Notsure but  tIhink I had readjusted the crimp die which I think added a stronger crimp which from what I

have read will change the impact point..Does this make any sense?

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Bohica793 posted this 17 October 2019

The immediate question is:  What changed between the original load and these?

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BudHyett posted this 17 October 2019

Not sure but think I had readjusted the crimp die which I think added a stronger crimp which from what I have read will change the impact point..Does this make any sense?

Yes, it does make sense. Each firearm is a law unto itself and sometimes little changes mean a lot; sometimes little changes do not mean a lot. There are many variables. Not only can the impact point be changed, but the group enlarged with this change. 

Add o this the possibility of the aiming device going bad, the suggestion to use the iron sights for testing and confirmation is good. 

One other test is to test the shooter. Take another pistol, preferably low recoil, to shoot to assure you are shooting well on this day. When I am serious about testing loads for rifles, I take my BSA international to shoot first to assure I am having a good day. It is the one known rifle that I own which shoots well. As strange as this sounds, there are days when I am the discrepancy.  

Country boy from Illinois, living in the Magical Pacific Northwest

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RicinYakima posted this 18 October 2019

2frogs, If you were using a Lee Factory Crimp die, yes it can make a huge difference. The die works, but with cast bullets it can make such a case reduction as to loose any accuracy you had. For accuracy with a crimp, a little goes a long way. For the revolver you only need enough for the powder to start to burn and bullet not pull out of the case.

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DBW posted this 18 October 2019

2frogs, You can easily check yourself by dry firing the revolver. If you close your eyes or if the gun moves when you pull the trigger you need to practice dry firing until it doesn't happen any more then concentrate on maintaining the steadiness when actually firing. Most of the time when I find myself in your situation that is the solution, but the crimp is  a definite possibility............DBW

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mashburn posted this 19 October 2019

It seems that no one paid any attention to Ken's post about the recoil ruining the Tasco aim point in one shot. I don't know what kind of optics were being used but I would suspect that if the handgun was shooting well with open sights and went south after optics were added tends to point to bad mounts or optics. I probably have one of the biggest collections of cheap bases and rings of anybody in the country. I pulled these off of customers rifles that wouldn't shoot accurately and I have a big box of scopes that got recoiled to death. Why I keep them I don't know. Years ago when I was playing with contenders and had a lot of barrels  I needed a bunch of scopes. Guess what, I got a Midway flyer advertising Tasco pistol scopes for around 20 or so dollars. I ordered eight of them. Most of my barrels were large calibers and guess what, like Ken said ,they didn't last but a few shots. I had two left that had never been on a gun and had them stored in a air tight container. A couple of years ago I pulled them out and when I tried to turn the caps on the scope adjustments the whole thing came off on both of them. Very fine quality indeed.

I haven't heard anybody mention this but here is a suggestion: make sure the mounts and rings or whatever are properly installed and tight. Get some factory ammo and fire that. Factory ammo should diagnoss  the problem pretty fast. Then we won't have to " what If"  anymore, if ammo or optics are the problem.

Mashburn

David a. Cogburn

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