sighting rifle

djmercer1 said:
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....
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Check the usual culprits (base to rifle, rings to base, rings tightened snug) and go from there. I'm sure many a rifle got fixed immediately simply by being handed to another shooter though. Kind of like how do you turn a 1 moa rifle into a 3-4 moa rifle? Hand it to my nephew.
 
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fiftycalforsquirrels said:
Something is loose, damaged, or very not aligned.
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Generally the problem is a loose nut behind the butt.


Buck1950 said:
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'.
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I had this exact same experience with a 50 BMG. Belonged to a friend and I couldn't get the thing to stay zero'd. Sent at least 10 rounds downrange before I discovered the scope was loose in the rings and the rings were loose on the rail. Tightened everything up and rough zero'd the thing but by that point I had had enough of the 50 BMG recoil and blast. :rolleyes:
 
i didnt check the overall build - 1st thing i noticed was scope was close to bolt and being no detachable mag and being a top load i didnt like that right off the start.... i offered a set of 'high rise' rings i had on hand and he didnt want - so only thing i was doing was rotating the scope (when i got it the reticle wasnt vertical and i had to rotate it), i did retorque the scope hold down bolts after rotating and pink loctite... because of access i ddnt check ring to rail or rail to rifle connections...

i am now wondering given that he zeroed at 150, and we assume the issue is scope-rifle alignment - if i shoot at 25m to start, shouldnt i be off even further to left that he was at 150 to right before he adjusted back? looks like i gonna be shooting the rifle - i just dont like the setup, and how this is going and not sure of his sight in... but i do want to trouble shoot and make sure rifle is on - but i think something else happening here and not the sight in process.

other than disassembly and starting from scratch anything else to check - perhaps i take my scope off my 300 to try 1st?

ths everyone...
 
Maybe a bad crown? Bad scope?
I would try a known scope, something you know is working! Check the crown? Make sure all screws are tight Ruger m77 need the front screw torqued to I think 60lbs or something like that, look it up. I mean they are not known for being crazy accurate rifle but at least moa, mine is!
 
Unless you have 'see-thru' rings for irons on close shots, I always get the scope as low as possible. My 'good' 22s are ca 1/16" at the bell. Heavier calibres want a bit more but Not a Lot ! Barrels don't 'whip' that much.
 
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Another thing to consider is, are the scope base mounting holes in the rifle off kilter in a serious way? Was just thinking in my head that if it's out by 10 feet at 100, it would literally be out by 12 inches at 10 meters...:poop:

I can't imagine a scope having that much built in adjustment to even compensate for that. Also, there's nothing wrong with rough dialing-in at 25 meters, whether it's a 22 or a 458. Might seem silly, but it seems silly to me to wail away at 100 meters and 30 rounds later still not know where you are.
 
fiftycalforsquirrels said:
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.
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Exactly, a vortex viper has 70 moa vertical and 35moa windage max adjustment. That’s ~6 feet vertical, +3feet horizontal at 100y. Also to see your shots 10’ aside the center of the target, you would need a FOV of 20’ and more. This is close to the minimum magnification of most scopes. At our range shooting 10 feet sideways, you would hear the second or third shooter beside you yelling that someone is on the wrong target.
 
I never did cotton to the Bushnell sighter you mentioned...found pulling the bolt and looking down the barrel at the target at 100 yards and then adjusting the scope to be more reliable for being on paper at 100 yards.

I have the Leupold magnetic bore sighters (no longer made that I know of; both the older one without a battery for a lighted scale, and the newer one with the battery and lighted scale) for many years, and they are usually within 4" at 100 yards, and sometimes I have been within an inch, depending on the ammunition used.
 
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