Is this normal 22-250 / 243 ?

Originally Posted By: JPK"Nothing to do with calibers at those ranges...as someone said, one rifle has higher rings or bases than the other. If both had the exact same scope height they would have both shot as high at 100."

This would only be true if the two loads had bullets with identical BC and velocity. If either velocity or BC is different then one bullet will drop more at 100yds than the other since time of flight will be different.

If the OP is using a relatively heavy, slow bullet in the 243 and a light, higher velocity bullet in the 22-250 then he could generate the same results even if scope height on both rifles is identical.

My prediction is that when he goes back with the 22-250 zeroed 2" high at 100yds his rifle will print low at 25yds by about an inch.

JPK

JPK

Zero chance any bullet or the way they are loaded {and still be safe} could alone account for 6 inches of difference over 75 total yards in those calibers. And it for certain cannot be contributed to any ballistic coefficient...over 75 yards???? Come on dude, you could only get that much difference between a shotgun slug and a rifle at 75 yards, and it still wont be 8 inches.
 
Originally Posted By: msincOriginally Posted By: JPK"Nothing to do with calibers at those ranges...as someone said, one rifle has higher rings or bases than the other. If both had the exact same scope height they would have both shot as high at 100."

This would only be true if the two loads had bullets with identical BC and velocity. If either velocity or BC is different then one bullet will drop more at 100yds than the other since time of flight will be different.

If the OP is using a relatively heavy, slow bullet in the 243 and a light, higher velocity bullet in the 22-250 then he could generate the same results even if scope height on both rifles is identical.

My prediction is that when he goes back with the 22-250 zeroed 2" high at 100yds his rifle will print low at 25yds by about an inch.

JPK

JPK

Zero chance any bullet or the way they are loaded {and still be safe} could alone account for 6 inches of difference over 75 total yards in those calibers. And it for certain cannot be contributed to any ballistic coefficient...over 75 yards???? Come on dude, you could only get that much difference between a shotgun slug and a rifle at 75 yards, and it still wont be 8 inches.

msinc,

You wrote this, "Nothing to do with calibers at those ranges...as someone said, one rifle has higher rings or bases than the other. If both had the exact same scope height they would have both shot as high at 100."

What you wrote is inaccurate.

For example, take two rifles, chambered whatever cartridges, shooting bullets with identical scope set ups. They are shooting bullets with identical BC's. But one shoots at 250fps greater velocity. If both rifles are zeroed at 25yds one rifle will not shoot "as high at 100" as the other. Right?

Or another example, take two rifles, chambered for whatever cartridges, shooting bullets with identical velocities, but one of the bullets has a greater BC than the other. If both rifles are zeroed at 25yds one rifle will not shoot "as high as 100" as the other. Right?

The differing trajectories in example 1, and then in example 2, are the result of different flight times for the bullets. Right?

JPK
 
No. For all practical purposes, any pair of comparable centerfire calibers, there isn't going to be an 6" difference between them over that range. Minor variation, sure. 6" no. At 500 yards, probably a big difference using different BC/velocity but at 75 there's not enough time for the BC to really matter.
 
Originally Posted By: NdIndyNo. For all practical purposes, any pair of comparable centerfire calibers, there isn't going to be an 6" difference between them over that range. Minor variation, sure. 6" no. At 500 yards, probably a big difference using different BC/velocity but at 75 there's not enough time for the BC to really matter.

Bang!!!!!!Thank you!!!!

Let me put it another way...we all agree that a lug nut has about as bad a BC as anything. If you could accelerate a lug nut to 3700 fps, no one is ridiculous enough to believe that it would drop 6 inches over just 75 yards, much less a boat tail pointed bullet cooking along at that speed, no matter the diameter. A shotgun slug doing 1/3rd that velocity don't drop that much over 75 yards and you think a 243 will???? As I said, ZERO chance, period, end of story.
 
msinc,

Please explain how your quote, "Nothing to do with calibers at those ranges...as someone said, one rifle has higher rings or bases than the other. If both had the exact same scope height they would have both shot as high at 100" is accurate.

Please explain how it could possibly be accurate with bullets of different BC's or velocities.

Please explain where in your original post you qualified your quote writing or inferring that at least some of the differential in the OP's 100yd POI has to be explained by the differing velocities, BC's or both.

Better yet, please explain how what I wrote is in any way inaccurate.

BTW, using Federal's ballistics calculator and picking a couple of Federal loads, the difference attributable to velocity and/or BC is about .7" (Edit: at 100yds)

JPK
 
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Buddy if you still believe a 22-250 or a 243 will drop 6 inches at 75 yards...because of BC...I want you to stay just the way you are, O.K.
 
It could be barrel harmonics. I have a Rem 223 and if I zero it with nosler 50 grain bullets and zero it then use the some load but use Speer TNT's same weight bullet the gun will shoot about 5 inches high at 100 yards. If I go back to the Noslers the zero will be spot on.Barrel harmonics is the only thing I can think of.
 
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