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> Rifles general discussion
> Phantom keyholing?
Phantom keyholing?
@ 04:28 pm (GMT) |
Scott StruifAt my range, the rules require that you staple paper targets to the OSB target boards, which the range maintains. I was testing some long-for-caliber bullets. The bullet manufacturer recommended a faster twist rate than that of my gun, so I was looking for evidence of instability. I wouldn’t have paid attention to the shape of the holes otherwise. I thought I detected a couple slightly out-of-round holes, but I’m not really sure. Paper tends to tear a little, so it’s hard to tell. Can a bullet tumble slightly when it strikes the wood backing behind a target? I have some transparency stock I can print on. Would that be better than paper for testing stability? Assuming there were a slight yaw in the bullet at 100 yards, would it get worse at 200 yards, or 300? Or do bullets stabilize the farther they fly? I could figure this out myself, but I’m running short on supplies, and the range is limited to 200 yards. |
Replies
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@ 09:21 am (GMT) |
Scott StruifRe: Phantom keyholing?I just bought a stack of disposable foam lunch plates. I can staples those to the backing boards, bottom-side facing me, to give the bullets some room to travel before striking wood. |
@ 10:00 am (GMT) |
Lane SalvatoRe: Phantom keyholing?Scott, if your bullets are yawing at 100 yards or are unstable in some other way that will increase with distance. That's just physics. Nothing moves toward greater stability unless there is the ability for onboard corrections. |
@ 10:35 am (GMT) |
Martin TaylorRe: Phantom keyholing?Yep lane is spot on!Even if stable @100 things change rapidly out further if its right on the edge of stability. Just went through this with a friends 6mm. Keyholes @100 with 4 different groups (almost one hole groups!) and struggling to hit the score rings @300! With your target board backing, staple a piece of cardboard on first then your paper. It will stop any taring of the paper. |
@ 11:56 am (GMT) |
David LenziRe: Phantom keyholing?I've had good luck with simply gluing paper targets to cardboard or other target backers as far as getting cleaner holes. I find that the more "free" the paper is, the worse the tearing generally.Of course, for most of the pointed ammo I shoot, if you push the paper petals back to center and scotch tape over the impact there isn't much of a "hole" there at all, but you can get a sense for whether the torn/sheared passage point is uniform. |
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@ 09:47 am (GMT) |
Scott StruifRe: Phantom keyholing?Thanks for the useful comments. At 200 yards any yaw or tumbling should be apparent. |
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