Thread: What could cause this?

Originally Posted by Micky Duck

were your targets at an angle to you??? just that the holes look to be going in left to right..if it was indeed less than square your error sideways is LESS than ruler measures.....

Good spotting, I thought that too, but I did my best to get it perpendicular with the shooting line.
It was 10mm aqua line Gib…created a small puff of white when a shot hit which I was thankful for. Didn’t need to walk the 300y, not knowing if I’d hit anything. Especially without the chrono.

Could the twisting bullet hitting the GIB cause the bullet to travel. Like when you are hand drilling a piece of metal without a centre punch to start things off.

I doubt it, but GIB is pretty flex. And it was a large ish sheet. Also reason why I didn’t like walking extra.

Really appreciate the thoughts everyone, keep em coming if you like.

hmm that being able to see if hit thing sounds good.... good use for broken sheets of gib.

Sample size, both when zeroing and shooting

Originally Posted by gimp

Sample size, both when zeroing and shooting

Agreed

Greetings,
I suggest you repeat the test with a better aiming mark. A hollow square or circle that you can quarter with your cross hairs will work a lot better. Also consider zeroing at 200 metres.
Regards Grandpamac,

Originally Posted by grandpamac

Greetings,
I suggest you repeat the test with a better aiming mark. A hollow square or circle that you can quarter with your cross hairs will work a lot better. Also consider zeroing at 200 metres.
Regards Grandpamac,

A diamond also works well hold crossbars on points of diamond

Was your Zero bang on to start with ?

or put your cross at 45 degrees for same reasons as previous two suggestions.

Both variations in the ammo and the shooter.

Could it be parallex related?

Originally Posted by Oldbloke

Could it be parallex related?

Good call.
If parallax not right it can cause all sorts of issues.
Have a look at todd hodnetts videos regarding parallax and the significance of bubble levels.

Sent from my SM-A226B using Tapatalk

typically vertical dispersion is inconsistency in how you control the recoil ie holding tightness inconsistency grip/or butt pressure ect
horizontal dispersion is grip and not lining up directly behind the rifle

thats pretty good shooting regardless so it could just be adjusting between rifles

if you want to get really serious about it get someone to film you shooting then you can really pick apart what you are doing

Originally Posted by Bill999

typically vertical dispersion is inconsistency in how you control the recoil ie holding tightness inconsistency grip/or butt pressure ect
horizontal dispersion is grip and not lining up directly behind the rifle

thats pretty good shooting regardless so it could just be adjusting between rifles

if you want to get really serious about it get someone to film you shooting then you can really pick apart what you are doing

Was going to suggest this - it's real hard to critique someone's targets like this when there could be a LOT of different factors at play... In all honesty it's almost no point in looking at the targets and offering up ideas without seeing the shooting end of things. The 'group diagnosis' diagrams are good but assume that all factors at the firing point are correct and controlled, and most of the issues are human factor not at the target end!

Well within 1 minute of deer , get out and shoot something for the pot

At 300m you do start to see minor wind effect the groups. Have a look at 'Applied Ballistics' and deliberately dial in a 10m/sec crosswind.
You'll see a couple of clicks to account for. 0.2milrads at 100m is 2cm, so that is 6cm drift at 300m (plus or minus one for height depending on direction).

Anything minor adds up too but if it were me i would leave the scope as is but really make sure that crosshair doesn't move independently to the target when you support the rifle / hands off / no cheek weld etc and bob your head slightly when looking through the scope. I do this every time (when you know you can risk taking the time). Bad parallax will definitely amplify any changes coming from your body position (that the terrain might be causing). Especially if your elbows aren't level....