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Double Grouping #14288295 11/17/19
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leftycarbon Offline OP
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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

300 BP

Re: Double Grouping [Re: leftycarbon] #14288351 11/17/19
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smithrjd Offline
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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.

Re: Double Grouping [Re: leftycarbon] #14289149 11/17/19
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Ackleyfan Offline
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Ive seen loose scope mounts cause double groups......something to look at!

Re: Double Grouping [Re: leftycarbon] #14289240 11/17/19
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Mule Deer Offline
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What scope?


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
Re: Double Grouping [Re: leftycarbon] #14289430 11/17/19
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smithrjd Offline
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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.

Alpha

Re: Double Grouping [Re: Mule Deer] #14289468 11/17/19
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leftycarbon Offline OP
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John,

It's a 3.5 X18 Swarovski



Lefty

Last edited by leftycarbon; 11/17/19.
Re: Double Grouping [Re: leftycarbon] #14289490 11/17/19
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saddlesore Offline
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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


If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
Re: Double Grouping [Re: leftycarbon] #14289794 11/18/19
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Godogs57 Offline
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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.


You only live once, but...if you do it right, once is enough.
Re: Double Grouping [Re: leftycarbon] #14290141 11/18/19
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Mule Deer Offline
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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.


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
Re: Double Grouping [Re: leftycarbon] #14290352 11/18/19
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brydan Offline
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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.
Bravo

Re: Double Grouping [Re: brydan] #14291354 11/18/19
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leftycarbon Offline OP
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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.

Re: Double Grouping [Re: leftycarbon] #14292329 11/18/19
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TX35W Offline
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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.

Re: Double Grouping [Re: leftycarbon] #14292643 11/19/19
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Pappy348 Online Content
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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.


What fresh Hell is this?

Don't be a Provincial Nitwit.
Re: Double Grouping [Re: TX35W] #14296158 11/20/19
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leftycarbon Offline OP
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Well It's not the scope.

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

LC

Re: Double Grouping [Re: leftycarbon] #14296173 11/20/19
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joshf303 Online Content
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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?

Re: Double Grouping [Re: joshf303] #14296329 11/20/19
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leftycarbon Offline OP
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SS custom #4 contour. Not saying mfg at this point.

LC

Re: Double Grouping [Re: leftycarbon] #14296361 11/20/19
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joshf303 Online Content
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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.
Re: Double Grouping [Re: joshf303] #14296680 11/20/19
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leftycarbon Offline OP
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loads that shot well do not now


Lefty

Last edited by leftycarbon; 11/20/19.
Re: Double Grouping [Re: leftycarbon] #14296780 11/20/19
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joshf303 Online Content
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Gotcha....

Re: Double Grouping [Re: leftycarbon] #14296985 11/20/19
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howard1 Offline
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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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