Interesting observation while shooting with a bi pod attached

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RichardSlinger

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I was shooting a Sako Finnlight chambered in the best cartridge ever invented last week.
I shot it with a very accurate load and observed the following:

1. Shooting with no bi pod attached, (off a sandbag)rifle shoots where I'd expect it to.
2. Shooting with a bi pod attached and deployed shot an inch higher than where it shot without a bi pod attached
3. Shooting with a bi pod attached and folded down (ie. not deployed and off a sandbag) also shot an inch higher than where it shot without a bi pod attached.

I'd expect there to be no difference between 1 & 3 given that the bi pod would not apply upward pressure on the barrel?

Has anyone ever experienced anything like that?
 
RichardSlinger said:
I was shooting a Sako Finnlight chambered in the best cartridge ever invented last week.
I shot it with a very accurate load and observed the following:

1. Shooting with no bi pod attached, (off a sandbag)rifle shoots where I'd expect it to.
2. Shooting with a bi pod attached and deployed shot an inch higher than where it shot without a bi pod attached
3. Shooting with a bi pod attached and folded down (ie. not deployed and off a sandbag) also shot an inch higher than where it shot without a bi pod attached.

I'd expect there to be no difference between 1 & 3 given that the bi pod would not apply upward pressure on the barrel?

Has anyone ever experienced anything like that?
Click to expand...

No, I don't use a bipod.

What was that cartridge, and were there many others invented last week?
 
The bi-pod probably isn't effecting the gun, what it is happening is your posture is changing behind the gun and on the stock comb from bench to bi-pod shooting. This changes your line of sight thru the scope and will magnify the effects of what is probably a very minutely small, otherwise undetectable bit of "scope parallax".
 
No POI shift on either of my precision rigs with or w/o a bipod. Problem may be in the floating / not-floating of the barrel and bedding / pillar block issues as mentioned.
 
I knew it was .270win........ I just knew it! I have a sako .270 win. Never put a bi-bod on it, no need for that.....a .270 is like a laser beam. On a serious note I have noticed changes on my A bolt medallion in .22-250 with the bipod on and off. Not enough to worry about though.
 
HOSSONE said:
I knew it was .270win........ I just knew it! I have a sako .270 win. Never put a bi-bod on it, no need for that.....a .270 is like a laser beam. On a serious note I have noticed changes on my A bolt medallion in .22-250 with the bipod on and off. Not enough to worry about though.
Click to expand...

Now there's a sensible chap :)
 
Ltbull01 said:
Pffft! Load the 7 Mauser to modern pressures in a modern action and try to say that!
Click to expand...

Been there done that!
The 7x57 is the cartridge that I used almost exclusively for 10 years, owned about 5 or 6 of them in that time.
I launched 140gr accubombs at lightning speed with it but......You get 7mm of extra case capacity in a 270.
 
When shooting off the bench or concrete my bipods are always padded (carpet) which is similar to shooting off ground or grass. Can't say under my circumstances that there was any change.
 
RichardSlinger said:
I was shooting a Sako Finnlight chambered in the best cartridge ever invented last week.
I shot it with a very accurate load and observed the following:

1. Shooting with no bi pod attached, (off a sandbag)rifle shoots where I'd expect it to.
2. Shooting with a bi pod attached and deployed shot an inch higher than where it shot without a bi pod attached
3. Shooting with a bi pod attached and folded down (ie. not deployed and off a sandbag) also shot an inch higher than where it shot without a bi pod attached.

I'd expect there to be no difference between 1 & 3 given that the bi pod would not apply upward pressure on the barrel?

Has anyone ever experienced anything like that?
Click to expand...

Would you guess that the sand bag adds very little friction to the stock as the gun recoils?

The bipod is adding to the mass of the rifle and thus affecting recoil. I would have thought that adding the bipod would have resulted in the shot hitting lower, not higher, but this could be more of a function of how the mass affects barrel harmonics more than the recoil.

With my T3 I had some loads where the presence of the bipod affected poi. Other loads with the same rifle and bipod had no effect, but that was with a more accurate load that was dialed in tighter to barrel harmonics.
 
non consistent preloading of the bipod also affects poi. using sandbags with bipod attached is the bipod touching the sand bags at any point during the shoot?
 
I could see this being harmonics, not exactly barrel harmonics, but adding ballast to the front, affecting the waveform of the barrel as it has more weight, the barrel still wants to do its "wiggle" it just has a heavier set of boots under it, if that makes any sense at all. Probably the silliest analogy I've ever come up with actually.
 
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