I am thinking 1/2 inch high

[Johnny Dangerr]

What brand ammo is she shooting? I can run the ballistics chart and see where they fall with a 100 yard zero.

Cheep stuff she buys out of the trunk of a car off Telephone Rd.

Lapua 123gr HPBT

[bearintex]

Cheep stuff she buys out of the trunk of a car off Telephone Rd.

Lapua 123gr HPBT

Second column from the left is the one you are interested in. This assumes a scope height of 2.1" and a velocity of 2720 FPS. PM me your email address and I can send you the full chart out to whatever range you want.

[Johnny Dangerr]

Second column from the left is the one you are interested in. This assumes a scope height of 2.1" and a velocity of 2720 FPS. PM me your email address and I can send you the full chart out to whatever range you want.

Her scope broke and she got a 3x12x56mm with a 30mm tube that looks like a beer can. I will take measurements and pm you...........

[BuckRage]

that's not going to change much to make a big difference unless shooting lr. you're center scope height is probably ly 1.5 to 1.75

[bearintex]

Her scope broke and she got a 3x12x56mm with a 30mm tube that looks like a beer can. I will take measurements and pm you...........

Will do. Measure center of scope tube to center of bore. There should be a relief hole just forward of the loading port, that is typically on the centerline of the bore. No chance you've got actual chronograph data, is there?

[catslayer]

Ok so I'm a little confused... Your saying you don't have access to 100 yard range?

I just plugged in box numbers on the Hornady superformance to shooters calculator... Assumptions are 2735 muv vel, shooting 140 grain sst, sight hight is 1.5 inch above bore (pretty standard).

Zero at 60 yards and you will on at 100. And never more than .6 inch low or .1 inch high between 25-100...

Honestly with this cartridge that is kind of a waste... A much more USEABLE everywhere zero would be to zero at 28 yards. That will put you just under two inches high at 100 dead nuts at 200, and just under 8 inches low at 300. Anything under 100 your within an inch and a half of point of aim point of impact...


The scope measurements at this range arent gonna make a big enough change to fool with imho... We are talking close range here... Now if you want to stretch it's legs... Ehh worth a quick measurement, but I would care much more about real Chrono data

[kcmarullo]

Johnny she can come out to my place and shoot anytime.

[howabouttheiris]

Would a good zero be 1/2 inch high at 50 yards.

Not 'high' ..... you should setup to be 'low'.

A rifle with a 2" scope height zeroed for 70 yards (middle of your stated distance) will shoot about 0.3" LOW at 50 yards.

[Johnny Dangerr]

Johnny she can come out to my place and shoot anytime.

Thank Keith......

[Slick8]

Cheep stuff she buys out of the trunk of a car off Telephone Rd.

Lapua 123gr HPBT

That guy quit selling, he lost his supplier...

[Johnny Dangerr]

Not 'high' ..... you should setup to be 'low'.

A rifle with a 2" scope height zeroed for 70 yards (middle of your stated distance) will shoot about 0.3" LOW at 50 yards.

The scope is 1 3/4

I like this idea...........

[howabouttheiris]

The scope is 1 3/4

That change of scope height will make only a surprisingly small effect on the 50 yard impact at a 70 yard zero.

A rifle with a 1.75" scope height zeroed for 70 yards (middle of your stated distance) will shoot about 0.25" LOW at 50 yards.


As others had mentioned. Both a 50 or 100 yard zero should not effect the ability of a shooter to take a successful shot at those ranges (pie plate size target zone).

Until the bullet drop angle gets higher than the scope angle, the round would impact lower than expected. On an unrelated note, this crossover distance is usually very close to 100 yards. Many shooters use a 100 yard zero, as adjustment is ALWAYS 'hold over' and not the combination of 'hold over' and 'hold under' that you would get with a 50 or 200 yard zero.

[Johnny Dangerr]

OK got the plan set.

Thanks brain trust.......................