Slug "stabilization" movement @ short distances
- Thread starter edosan
- Start date
In my belief that there are too many variables such as twist rates weights power it’s endless! I believe that every one is right in the their set up in that moment in time temperatures wind etc. more times than not maybe every one is right! I am not a judge or jury but I also believe that we are all victims of environmental conditions and our own abilities at the time . I do shoot a lot sometimes something as simple as a regulator setting or hs tension all has an effect. I am to the point let the gun show me what it likes. I am never done testing because that would bore me. Just a thought
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Such an effect is observed when shooting against the sun,
such a long slug shows such an effect
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I have been reading a bit about it and at short distances usually when the Yaw movements happen, groups are not a "perfect" circule hole, and probably the barrel is not a perfect match for the pellet/slug.
Now making a better group @100 y vs donno @30 y is hard to believe, but similar group might be if @ 30y the projectile is still in "Yaw" mode, since holes will be bigger and not circle as usual, so they may look similar ... (been actually 100 y wider but perfect round holes)
Now making a better group @100 y vs donno @30 y is hard to believe, but similar group might be if @ 30y the projectile is still in "Yaw" mode, since holes will be bigger and not circle as usual, so they may look similar ... (been actually 100 y wider but perfect round holes)
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Good point, and sounds logical. But it also assumes that, for this example, that the projectile is only yawing and not moving off bore axis as it yaws. That seems less likely to me but I suppose it is possible. Good conversation in any event.
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I posted this as a reply to a one year old thread and it didn't seem to come up in the "chronylogical order" so I will copy it here.
It depends on the definition of accuracy. Whether you are stating absolute group size as a measurement of width, or group size in measurement of angle. I can see that through epicyclic swerve, the group size measured in degrees could theoretically be larger at a very close range when measured in angle. But the width of the group will always be larger at longer ranges even if the group angle is less. Probably more apparent in long range centerfire rifles which offer a more stretched out comparison of 20:1. It's hard to get any meaningful measurement of group size in angle for an airgun at 5 yards in order to compare it to 100 yards. And environmental factors are a much bigger influence for an airgun slug at 0.1 bc verses a bullet at 0.5 bc
So airgunners are never going to observe this but a 1,000 yard rifle shooter might
.
https://youtu.be/KH9SCbCBHaY
.
The old thread is here
https://www.airgunnation.com/topic/slugs-distance-to-stabilize/
It depends on the definition of accuracy. Whether you are stating absolute group size as a measurement of width, or group size in measurement of angle. I can see that through epicyclic swerve, the group size measured in degrees could theoretically be larger at a very close range when measured in angle. But the width of the group will always be larger at longer ranges even if the group angle is less. Probably more apparent in long range centerfire rifles which offer a more stretched out comparison of 20:1. It's hard to get any meaningful measurement of group size in angle for an airgun at 5 yards in order to compare it to 100 yards. And environmental factors are a much bigger influence for an airgun slug at 0.1 bc verses a bullet at 0.5 bc
So airgunners are never going to observe this but a 1,000 yard rifle shooter might
.
https://youtu.be/KH9SCbCBHaY
.
The old thread is here
https://www.airgunnation.com/topic/slugs-distance-to-stabilize/
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Just speculating here.
For a top scoring short range centerfire BR shooter with a 6mmPPC to agg in the .1's of an inch for a whole match at 100Y, the projectiles they use, which are flat base bullets, would need to be nearly perfectly stable, lacking all the effects posted earlier to any discernible degree.
As well, match 22rf's which only go 1050 fps for standard velocity ammo with a 40 grain bullet can exceed 1/2" at 100Y in tests. In 50ft comps it's hole in hole, and only slightly more at 25Y. So 22rf's are figured out.
Taking these examples into consideration it's only a matter of time and experimentation before slugs don't fly like the projectiles used in that tank. I'm not saying all slugs do. It looks like some combo's are encroaching already on what a 22rf is capable of but not quite there yet. It's just getting everything working optimally I think.
For a top scoring short range centerfire BR shooter with a 6mmPPC to agg in the .1's of an inch for a whole match at 100Y, the projectiles they use, which are flat base bullets, would need to be nearly perfectly stable, lacking all the effects posted earlier to any discernible degree.
As well, match 22rf's which only go 1050 fps for standard velocity ammo with a 40 grain bullet can exceed 1/2" at 100Y in tests. In 50ft comps it's hole in hole, and only slightly more at 25Y. So 22rf's are figured out.
Taking these examples into consideration it's only a matter of time and experimentation before slugs don't fly like the projectiles used in that tank. I'm not saying all slugs do. It looks like some combo's are encroaching already on what a 22rf is capable of but not quite there yet. It's just getting everything working optimally I think.
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