Scope siting problem..need help


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Niel4
August 11, 2009, 08:32 PM
Ok so I get my scope sighted almost perfectly at 50 yds.....then move to 100 yds and I don't even hit the target!

Shooting a Marlin 60 22 LR with a Bushnell .22 Rimfire 3-9x32 Riflescope:http://www.amazon.com/Bushnell-Rimfire-3-9x32-Riflescope-Black/dp/B0000A0AHF/ref=sr_1_1?ie=UTF8&s=electronics&qid=1246455435&sr=8-1

So now I am doing the trial and error thing and almost have it down @ 100 yds....plan on going to the range wed to finish up....I have a couple questions though:

- will it be off at 50 yds after I get it right at 100?
- should I zero in at the bullseye @ 100 or do it 3 " up? (I read this somewhere?)

Man o man any help would be appreciated.

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Big_E
August 11, 2009, 09:17 PM
Well 100yrds with a .22lr isn't the best option unless you use subsonic ammo.

When using high velocity ammo, around 75yrds (I believe) the bullet goes from supersonic to subsonic, messing up its trajectory. Whereas sub sonic ammo continues to be subsonic from when leaving the barrel all the way to its target.
** Which is why "match" ammo is all subsonic, and it is loaded much more precisely than your run o the mill bulk ammo.

I had a problem when zeroing my .17hmr, at 25yrs i was dead on, then at 100 not even on the target. It was shooting high, so i lowered the zero and wola! sub MOA if I do my part.

Niel4
August 11, 2009, 09:22 PM
I just shoot the 22 lr value packs; remmington, federal and winchester...I have no idea if they are subsonic/supersonic.

Should I just scope in at 75 yds?

Any other comments welcome.

AKElroy
August 11, 2009, 09:40 PM
I sight my .22's to hit point of aim @ 50 yrds; I rarely have a critter shot longer than that & I can get head shot accurate w/ cheap ammo sighting dead on @ 50.

Big_E
August 11, 2009, 10:41 PM
I believe value packs are supersonic but not as much as CCI minimags or Rem thunderbolts.

I would say go 50yrds for the zero. Most shots w/ a .22 are within that distance.

rcmodel
August 12, 2009, 11:37 AM
A .22 has too high a trajectory to make a 100 yard zero practical.
Unless all you do is shoot at 100 yards.

See this about that:
http://www.gunsmoke.com/guns/1022/22ballistics.html

I would zero at 50 yards and then learn how much hold-over you have to use at longer ranges.

rc

krs
August 13, 2009, 10:50 AM
Yeah, bullet drop with 22 lr is about 3" at 50 yards and almost 13" at 100 yds typically and without consideration of all the sub or super sonic factors. That right there is enough to drop you off a target if you haven't worked out your holdover.

And then there are the effects of headwinds, tailwinds, crosswinds, and gusting winds on that little slow moving bullet over the entire distance that would plumb amaze you if you could see it happening.

You have lots of very puzzled new .22 shooters, and plenty of equally puzzled old .22 shooters as well.

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