sighting rifle

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djmercer1

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so, i bore sighted a rifle with an optical and then followed up verifying with laser - all seemed good like others i have done... owner then went to shoot to fine tune and was off 10' and took 13 shots to get on - any ideas?

I have done more than a few rifles before - always on the paper at 100-150m and never needed 13 shots to fine tune , 10' out i have never experienced.... is something amiss with scope mounting, barrel etc or am i missing something?
 
djmercer1 said:
so, i bore sighted a rifle with an optical and then followed up verifying with laser - all seemed good like others i have done... owner then went to shoot to fine tune and was off 10' and took 13 shots to get on - any ideas?

I have done more than a few rifles before - always on the paper at 100-150m and never needed 13 shots to fine tune , 10' out i have never experienced.... is something amiss with scope mounting, barrel etc or am i missing something?
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Who cares? The guy sighting in the rifle doesn't know what he is doing?

Bore sighting is only meant to get the rifle close. If it isn't accurate, who cares? 🤷‍♂️
 
iron cat said:
Pretty hard to comment on what went wrong as we were not there to witness the sighting itself.
I have had people at the range go through a box of shells and give up , give me the rifle, and have had their rifles on within three shots.
Cat
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Same here. I would go over the entire procedure again and then go out and shoot it and see what it does!
 
". . .bore-sighted with 'optical' ? What's that mean ? Then '...verified with laser' ? Not clear what you're doing. I use a laser that sits in the bore muzzle ($60), to adjust scope at 25 (my back yard). That gets me on paper, often good out to 100. Then I can dial it in for MOA-ish accuracy - whatever I think the rifle can do. This has worked for my CZ-VMTR, Sav B22FV, Rem 308, Sav-12 .308, Ruger x39 and many others. I do the Laser in the evening, mainly so I can see the light on a target, but also so my neighbours are less likely to notice me (living in town) 😉 .
Maybe your scope is loose or damaged ?
 
The same thing happened to a buddy who I bore sighted a Bushnell Trophy II . I put 3 rounds 1MOA dead center@ 100M. He took it out and by the time he went from his house back to the same range (farm non commercial),it was out 11" high right. He burned up half a box of .30-06, still couldn't get it close so, he brought it back. When I put the bore sighter back on, the crosshairs were off a mile. Out of frustration,he'd cranked the knobs until there was no travel left. I reverse imaged the crosshairs with a mirror,remounted the scope to rifle and bore sighted,again. 3 rounds down range,again, same result. Now,to some this may seem like a real dirty trick,but,I sat him down at the bench,stood behind him,so,he couldn't see what I was doing,racked the bolt and handed him the empty rifle over his shoulder and said "Rifle is hot,Take a shot" which he did. The rifle went "click",but, he flinched so bad he almost got whiplash. He was pissed and embarrassed,but, when he saw nobody was laughing,he figured it out quickly. I gave him a set of ear protectors and problem solved after 5 more shots.
 
so, a couple more details:
1) 10' - yes. 10 feet
2) optical bore sighter, as in a bushnell type with arbors like their 'Professional Boresighter".... i had batteries for my laser that is a cartridge type from 'Ritesight' enroute
3) i didnt mount the scope, build the rifle etc - he just asked me to try and get him close to reduce ammo waste when shooting - its a 338wm, so each shot is costly...

i wasnt there when it was sighted by shooting - but 10' seems like alot especially considering my past luck with same procedure, have done this before and never 'off the paper'.....

appreciate the help...
 
Trimmer 905 said:
The same thing happened to a buddy who I bore sighted a Bushnell Trophy II . I put 3 rounds 1MOA dead center@ 100M. He took it out and by the time he went from his house back to the same range (farm non commercial),it was out 11" high right. He burned up half a box of .30-06, still couldn't get it close so, he brought it back. When I put the bore sighter back on, the crosshairs were off a mile. Out of frustration,he'd cranked the knobs until there was no travel left. I reverse imaged the crosshairs with a mirror,remounted the scope to rifle and bore sighted,again. 3 rounds down range,again, same result. Now,to some this may seem like a real dirty trick,but,I sat him down at the bench,stood behind him,so,he couldn't see what I was doing,racked the bolt and handed him the empty rifle over his shoulder and said "Rifle is hot,Take a shot" which he did. The rifle went "click",but, he flinched so bad he almost got whiplash. He was pissed and embarrassed,but, when he saw nobody was laughing,he figured it out quickly. I gave him a set of ear protectors and problem solved after 5 more shots.
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Not unusual at all.
Yesterday a couple off guys showed up at the range to do a quick sight in on a couple of rifles as I was getting ready to pack up the long range E targets.
I asked they wanted me to shut the range down so they could post targets, and they said " no, we'll just use the ones that are up- not too many holes in them".
When I got back from storing the Shotmarkers and getting my own stuff stowed in my truck , they were packing up . One if them said " we gotta come back later, those target are too small for sighting in"
They were the 12" shoot'nsee targets at 25 and 50 yards.
Before I could offer to help, they were in the truck and gone!
I did not see any bore sighting going on at the bench while I was packing up, just a lots of shots and turret twisting!
Cat
 
iron cat said:
Not unusual at all.
Yesterday a couple off guys showed up at the range to do a quick sight in on a couple of rifles as I was getting ready to pack up the long range E targets.
I asked they wanted me to shut the range down so they could post targets, and they said " no, we'll just use the ones that are up- not too many holes in them".
When I got back from storing the Shotmarkers and getting my own stuff stowed in my truck , they were packing up . One if them said " we gotta come back later, those target are too small for sighting in"
They were the 12" shoot'nsee targets at 25 and 50 yards.
Before I could offer to help, they were in the truck and gone!
I did not see any bore sighting going on at the bench while I was packing up, just a lots of shots and turret twisting!
Cat
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LOL Sometimes,you really need to just shake your head,don't you?
 
Trimmer 905 said:
LOL Sometimes,you really need to just shake your head,don't you?
Click to expand...
There were more than a new experienced shooters there, our long range group had just finished a long range fun shoot with a small lunch at noon.
We actually set up four rifles that day, one with open sights and the other with aperture sights, and had no issues getting on with a few shots then zeroing at 200 and 300 meters.
I guess some guys do not want to feel embarrassed by asking for help.
Cat
 
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From what I understand... if a guy was off 10 feet at say 100 yards/meters... the scope would look fairly misaligned relative to the bore.

Considering a 20 minute rail has a noticeable to the naked eye slant to it...that is equivalent to 20 inches. If it were off 10 feet(120 inches) at 100 meters... the scope would very much look like it was on some sort of angle opposite of the bore.

Not to mention.... the majority of scopes to even have the adjustment range to dial 120" at 100 yards is pretty slim.... if we're talking off by 10 feet at 1000 yards... thats probably pretty normal if a guy doesnt have a clue, lol

Something is loose, damaged, or very not aligned.
 
A good point about Mirro-testing a scope. Last year there was a new member with a BP 'package rifle' that was 'set up' by the 'pros at BP'. Fellow cursed the first half of a box of 308 before I suggested I look at the rifle. The rings were loose on the rifle and the scope was loose in the rings. At BP prices the 'Pro' cost him at least $30 for half a box Plus the frustration and embarrassment factor. And if I wasn't there he prob would has shot the whole box and still not known what was going on. I went thru that scene once, luckily it was with a 22LR so only a couple bucks of ammo. The rifle mounts were not tight on the receiver and I didn't think to check them on a NIB rifle 'back then'.
 
He said it, 338 win mag!! The guy doesn’t know how to shoot and the rifle is too much gun for him. You need to get to the range and shoot it for him and see what you get if you can shoot a 338 win mag!
 
Tell him to sight in at 25 yards first with a large piece of cardboard backing his target of choice..... once he has a nice tight group at 25 yards he can move to 100.
 
the guy has experience shooting (Inuk, so sustance hunting), tho i think he has shot upto 7mm mag and has a 10ga - granted a 338 win mag is getting heavy on recoil, i havent shot 1 but have 300win mag and have shot shot 338 lapua, so i wanna shoot it myself when i get the chance and not afraid of it or me being unsteady....

i checked my ballistic table and against the box data when setting the scope - tho i dont have my chrono to verify the ammo is good... the rifle has only fired about 1 box of cartridges (its a ruger m77) and cant remember the scope model.... he just got it used recently and was his 1st time shooting it - is it possible the rifle is inherently not accurate and was dump 2nd hand(if what i am told is correct, the prior owner sold it with only a few rounds through it)?

i am puzzled on this - have mounted too many scopes with same process and never this far off....
 
First time using a used scope and it's way off.... if the rings are tight, and the shooter is reasonable a broken scope might account for it being 10 feet off target.
 
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