5 Day COLD BORE TEST.

BongoBob

BongoBob

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Somewhere in B.C.
After reading one of the recent "hunting accuracy" threads where people were debating which was more useful/important...range sessions with tiny groups or cold bore consistency etc, I thought it might be interesting to try shooting five - 3 shot groups at 100 yards with at least 24 hrs between groups to see if there would be much variation from day to day.

All 5 cold bore shots were shot at the same target, then did the same with the second and third follow up shots, so we're getting an idea of this rifle's shot to shot repeatability with the chosen load on any given day.

I colored in the bullet holes with a different color after every session (see pic) to keep track of the day to day results.

I'm quite sure I "pulled" the far left shot on target 2 and far right shot on target 3.

Gotta say I'm pretty satisfied with this rifle's performance, and looking forward to taking it out this season for deer.

The rifle is a Rem 700 .308 with a new Benchmark barrel, trued and bedded action and nice trigger. Guntech did the barrel install and truing.
The load is 44.5g Varget w/ 150g Accubonds - Rem brass & CCI 200 primers. 2780 fps.

image_zpsk2dm8uro.jpg

image_zps1k2gxjha.jpg
 
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Here is a target I shot two shots on, one year apart... to see how solid my scope and bedding were... my 338-06

The two shots are considerably less than an inch apart... in both cases the barrel had been fired previously and left fouled. No scope adjustments from one year to the next.

The distance was 350 yards

dennisstarget-0.jpg
 
guntech said:
Here is a target I shot two shots on, one year apart... to see how solid my scope and bedding were... my 338-06

The two shots are considerably less than an inch apart... in both cases the barrel had been fired previously and left fouled. No scope adjustments from one year to the next.

The distance was 350 yards

dennisstarget-0.jpg
Click to expand...

Very nice Guntech, but I'm not surprised, you built both these guns!
 
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Geez, I fiddle with my scopes every time I'm at the range... (generally because I shoot varying distance though )

It would kill me to not fiddle with something for a full year lol.
 
BongoBob said:
After reading one of the recent "hunting accuracy" threads where people were debating which was more useful/important...range sessions with tiny groups or cold bore consistency etc, I thought it might be interesting to try shooting five - 3 shot groups at 100 yards with at least 24 hrs between groups to see if there would be much variation from day to day.

All 5 cold bore shots were shot at the same target, then did the same with the second and third follow up shots, so we're getting an idea of this rifle's shot to shot repeatability with the chosen load on any given day.

I colored in the bullet holes with a different color after every session (see pic) to keep track of the day to day results.

I'm quite sure I "pulled" the far left shot on target 2 and far right shot on target 3.

Gotta say I'm pretty satisfied with this rifle's performance, and looking forward to taking it out this season for deer.

The rifle is a Rem 700 .308 with a new Benchmark barrel, trued and bedded action and nice trigger. Guntech did the barrel install and truing.
The load is 44.5g Varget w/ 150g Accubonds - Rem brass & CCI 200 primers. 2780 fps.

image_zpsk2dm8uro.jpg

image_zps1k2gxjha.jpg
Click to expand...

It's pretty clear there is a tendency for a flyer in your groups, and that makes it pretty clear that this gun is unacceptable for hunting, as there is no way to tell if the flyer will be your first cold bore shot. This type of accuracy is unacceptable in a hunting rifle, as a deer kill zone is only about 10" in diameter. I recommend you get rid of this rifle and buy a .375 Ruger immediately.
 
Gatehouse said:
It's pretty clear there is a tendency for a flyer in your groups, and that makes it pretty clear that this gun is unacceptable for hunting, as there is no way to tell if the flyer will be your first cold bore shot. This type of accuracy is unacceptable in a hunting rifle, as a deer kill zone is only about 10" in diameter. I recommend you get rid of this rifle and buy a .375 Ruger immediately.
Click to expand...

You're probably right Gate, I should get rid of it. As you well know, the only shot I'll take is the often forgotten but highly effective "pipe cleaner" in which you must place your bullet directly up the deer's left nostril. This gun won't cut it ;)
 
Interesting. Did you note environment differences during this test such as wind, temperature, etc? Might give some insight to those fliers if precision was a secondary concern of the test. Beautiful looking, and accurate, rifle.
 
hend238 said:
Interesting. Did you note environment differences during this test such as wind, temperature, etc? Might give some insight to those fliers if precision was a secondary concern of the test. Beautiful looking, and accurate, rifle.
Click to expand...

The environmental factors were fairly consistent as far as temp, humidity etc. There was one day that was pretty windy, so it's possible there was some effect, but I knew when I pulled the trigger that I'd pulled the shots that were "fliers". One of them was caused by the guy next to me with a muzzle break...he touched one off just before I did which caused me to jerk the trigger a bit as I wasn't expecting him to shoot. The other was just a less than perfect shot.
 
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Now that you have a better idea than most do where your cold bore shot is going how will you use the information? Will you adjust the zero for the first shot, keep it in mind when taking the cold bore shot, do nothing, or use it for pre-emptive spin drift? Just curious.
 
Dogleg said:
Now that you have a better idea than most do where your cold bore shot is going how will you use the information? Will you adjust the zero for the first shot, keep it in mind when taking the cold bore shot, do nothing, or use it for pre-emptive spin drift? Just curious.
Click to expand...

I'll adjust zero for the first shot. The follow up groups are close enough to the cold bore shots that I don't anticipate it being an issue if a follow up is actually needed...especially at the distances shots at deer usually happen at around here.
 
I sight my rifles for 50 yards when I'm hunting yer neck of the woods. LOL
Just kiddin ;)
But I have killed lots of those particular deer (you know where) at distances better measured in feet.

Nice rifle Greg, I'd hunt it with confidence for sure ;)
 
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