Flyers

stock bedding

improper scope mounting( over tightening ring screws)


trigger guard screws hitting the bolt locking lugs

scope mount screws too long and hitting the barrel threads.

bolt handle hitting the stock

mainly stock bedding though
 
Different brands of ammo often will vary results in accuracy.

Watch someone shooting a semi auto and you will sometimes see the empty cases ejected all over the place rather than a more predictable spot.

Same case same projectile same weapon. Usually powder charge is not the same.
 
I always thought the first cause was the shooter. If it is the first shot all the time, it is barrel temperature/bedding.
 
if the rifle constantly throws 1 out 3 shots outside a group then re-check your bedding...


are these handloads or factory.. always the same load or do different loads do this..??
 
Barrel harmonics.

If the bullets leaves the muzzle at slightly different times, which they all do, and you have a lot of vibration, the muzzle can actually be pointing in different directions. Say you have a very consistent load that typically only has a 10fps variation of MV, but every few rounds you get one that is running 25fps different. If you have a bad harmonic vibration, that round is probably going to be a flyer.

When you talk about "working up a load" for a rifle you are looking for a load that causes minimal harmonic vibration so it will be more tolerant of other deviations in the load. If you don't load your own, try several good quality off the shelf loads to try and find one that produces minimal vibration in your particular rifle.
 
How often does your flyer occur... 1 out of 5... 1 out of 20 ...?

Does it happen early or late in your shooting?

Is it consistently happening between the X and X shot?

What distance are you shooting?

What rifle/scope combo are you using?
 
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