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 Post subject: I think I know the answer but......
PostPosted: Fri Aug 30, 2019 11:03 am 

Joined: Thu Oct 15, 2009 11:46 am
Posts: 458
Location: Central Missouri
Last week I bought a new Tikka T3x in 270 Win. I outfitted it with a scope and along with two handloads headed to the range to sight it in. I had loaded 130 gr SST's and BT's over the same charge of RL-16.

After getting the scope adjusted, I proceeded to shoot groups at 100 yards. These were 3 shot groups and I cooled the barrel between groups using a Chamber Chiller device (wonderful item, BTW).

With each group, regardless of bullet used, I had two holes touching or nearly so and one 3/4 of an inch away or so. The location of the flyer varied slightly but the distance was virtually identical.

My theory is that the flyer was the first shot fired from the "cold" barrel and the other two were from the "warm" barrel. Being the ballistic genius I am, it never occurred to me at the time to slow down and check each shot through the spotting scope to verify this.

So, do you guys think I'm correct or is the potential cause something else?

Ron

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 Post subject: Re: I think I know the answer but......
PostPosted: Fri Aug 30, 2019 12:02 pm 
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Joined: Sat Oct 30, 2004 6:45 pm
Posts: 22099
Location: Cheyenne, WY
try 4 shots. I always make four. Three for group, one for verifier if needed.

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 Post subject: Re: I think I know the answer but......
PostPosted: Fri Aug 30, 2019 12:42 pm 

Joined: Wed Nov 08, 2006 2:49 pm
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Location: Northern British Columbia
FOTIS wrote:
try 4 shots. I always make four. Three for group, one for verifier if needed.


This.

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 Post subject: Re: I think I know the answer but......
PostPosted: Fri Aug 30, 2019 3:28 pm 
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Joined: Thu Nov 04, 2004 12:08 pm
Posts: 19961
Location: Rockford, MI
Or use the chamber chiller between shots.

JD338

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 Post subject: Re: I think I know the answer but......
PostPosted: Sun Sep 15, 2019 4:50 am 

Joined: Tue Sep 28, 2010 4:43 am
Posts: 58
One or two 3 shot groups is not a statistical credible sampling. Perhaps the three shot groups are the true precision for this load.
What type of wind flags are you using?
If you prefer 3 shot groups, shoot five groups with each load and take the average. An average of ten groups would be a better sampling.
Go back on a different day and reshoot the loads. Never make final sight adjustments or load decisions based on one shooting session.


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 Post subject: Re: I think I know the answer but......
PostPosted: Sun Sep 15, 2019 4:51 am 

Joined: Tue Sep 28, 2010 4:43 am
Posts: 58
One or two 3 shot groups is not a statistical credible sampling. Perhaps the three shot groups are the true precision for this load.
What type of wind flags are you using?
If you prefer 3 shot groups, shoot five groups with each load and take the average. An average of ten groups would be a better sampling.
Go back on a different day and reshoot the loads. Never make final sight adjustments or load decisions based on one shooting session.


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 Post subject: Re: I think I know the answer but......
PostPosted: Sun Sep 15, 2019 4:54 am 

Joined: Tue Sep 28, 2010 4:43 am
Posts: 58
Sorry for the duplicate. Tried to delete one but couldn't find the button?????


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 Post subject: Re: I think I know the answer but......
PostPosted: Sat Sep 21, 2019 6:51 am 

Joined: Sun Dec 24, 2006 12:20 pm
Posts: 29362
Location: Northern Virginia
Ron, if it repeats like that over a few 3 shot groups usually shortening the COAL a few thousands will pull it in. I don’t really let my barrel cool between shots since I wanna see where 3 rounds land in a warm barrel. Since the 3rd is only about 3/4’s out I think you could minimize it with seating a little deeper. Still, sounds like a typical Tikka and is just laying them in there.

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