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I know this has been discussed before, but what tends to cause double grouping.

My 6.5 PRC just started doing it . 2 groups about 3/4" apart.

Checked guard screws, bases are epoxied. Scope rings (Leupold QD) torqued 22 in. lb.

This rifle usually would put 5 in .40-.75"

Lety

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My Tikka in 6.5 Creed does the same thing with Accubonds, Three touching, and two touching about 1/2" apart. No idea, it does not do that with other loads.

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Ive seen loose scope mounts cause double groups......something to look at!

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What scope?


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On my Tikka a Meopta Meopro 4.5X14X44. Doesn't do this with other loads. Not really an issue, just over MOA. Plenty good for Minute of Deer.

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John,

It's a 3.5 X18 Swarovski



Lefty

Last edited by leftycarbon; 11/17/19.
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I have had rifles do that if the clearance holes for the action screws were not in line with the screws and they were touching.Might try drilling them out a tad


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I did everything you could in an attempt to get my Pre 64 model 70 to quit two-grouping. It was bedded 3x, full length, floated, etc. Re tighten every screw, new scope mounts, relieve magazine box, relieve action screws, bolt lug engagement checked. New scope. Tried every load known to mankind. Consulted several of the Campfire Illuminati. Nothing worked. My rifle still shot two half inch groups an inch and a half apart. It was more than accurate for “normal” shots on deer, say, 300 yards and in, but it drove me mad.

Finally my rifle revealed to me that she just plain hated Nosler bullets....despised them. I never suspected that and failed to ever consider that little point. That was it. Sierra Gamechangers? Berger VLD’s? Quarter inch groups.


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leftycarbon,

I haven't found ANY scope brand to be free of occasional problems--which is why when a rifle starts giving me problems that don't go away with easier fixes, one of the first things I try is another scope.


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Originally Posted by leftycarbon
I know this has been discussed before, but what tends to cause double grouping.

My 6.5 PRC just started doing it . 2 groups about 3/4" apart.

Checked guard screws, bases are epoxied. Scope rings (Leupold QD) torqued 22 in. lb.

This rifle usually would put 5 in .40-.75"


How many 5 shot groups did you shoot that followed the same pattern?

Last edited by brydan; 11/18/19.
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Originally Posted by brydan
Originally Posted by leftycarbon
I know this has been discussed before, but what tends to cause double grouping.

My 6.5 PRC just started doing it . 2 groups about 3/4" apart.

Checked guard screws, bases are epoxied. Scope rings (Leupold QD) torqued 22 in. lb.

This rifle usually would put 5 in .40-.75"


How many 5 shot groups did you shoot that followed the same pattern?


The last 5 or 6 groups. 2 different loads. Today two shots in a bug hole at 11 0 clock and three in a bug hole at three 0 clock. About a inch between them.

Pulling scope tonite and putting my40X Br scope on.

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Once I've eliminated scope problems for double grouping, I start looking for to a bedding problem. There might be two slightly different ways the rifle is sitting in the bedding. Haven't seen it happen with well bedded rifles but have seen it happen with un-bedded Tikkas that finally shoot the bedding a tad loose and have seen it with a Ruger a gunsmith bedded way too tight for me--was very hard to separate the action from the bedding and that gun would double group. When I rebedded it the issue went away.

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I ran into that when I mounted an allegedly AirGun compatible Weaver rimfire scope on my Air King. Moved it to a real .22 and it stopped. The Air King uses opposing pistons to make it "recoilless", but there's a lot of movement as the action slides around during the process.


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Well It's not the scope.

Double grouping and 2 &1 with my 40X BR scope.

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Originally Posted by leftycarbon
Well It's not the scpe.

Double grouping and 2 &1 with my 40X BR scope.

LC



Factory rifle or custom? If a custom, who’s barrel is it?

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SS custom #4 contour. Not saying mfg at this point.

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Originally Posted by leftycarbon
SS custom #4 contour. Not saying mfg at this point.

LC


From what I’m gathering from your post is that this is a new occurrence with 2 new loads? Loads before shot well?

Last edited by joshf303; 11/20/19.
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loads that shot well do not now


Lefty

Last edited by leftycarbon; 11/20/19.
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Gotcha....

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I think i read where deeper bullet seating may help prevent double grouping. May give it a try.

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