tackb
Well-Known Member
To zero is to coincide your poi with poa , this gives you a datum point for all other corrections wether your a seat of the pants aim offer or a measure it and correct accordingly type ?
Fast and flat - really??.....
- Thread starter willyroe
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To zero is to coincide your poi with poa , this gives you a datum point for all other corrections wether your a seat of the pants aim offer or a measure it and correct accordingly type ?
+1
I can never understand why people have such a fascination with 'zeroing' a rifle x inches high at xx yards - but then, I suppose that might have something to do with having learned to shoot as a child, using iron sights!
As mentioned, a rifle is zeroed when the POI and the POA are both the same place.
deeangeo
Well-Known Member
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I think people describe their zero as "x inches high, at yy yards" is because One-Inch-at-One-Hundred is easy to remember and for the majority of stalking, with the majority of rifles, gives you a point and shoot setup.
As to it being a point of impact relative to 100yards/meters, this will be a consequence of the fact that the further you want to zero the harder it is to find a suitably long range/field to zero on.
Certainly I find it easier to remember an inch high a 100 meters, rather than zero'd at 157 meters.
Oh and it saves on the walking to check your targets if they are only 100m away
I think a rifle is 'zeroed' when the sights have been set to the notional 'zero'. You can actually do this on some 'scopes, but the vernier aperture sights as on target rifles seem to me to give the best demonstration: you adjust the sights so that the bullet falls where you want relative to the point of aim, and then you slacken off the screw on the the scale on the fixed part of the sight and set the zero on that scale to the zero on the moving part. That would be it zeroed.
Having done that, you can then describe your zero in terms of the relationship between POI and POA at whatever distance you like: the rifle is still zeroed, however far or near you choose to compare them.
tackb
Well-Known Member
204 Works for mewith my .25-06 ATB
The flattest 25-06 I can find is 1.28 0 6.47 so even at 300m using the 209 formula would only put you 2.5" away from aim point ? Still a kill I would say?
What are you using that's only 4" (100mm)low at 300m with a 200m zero?
deeangeo
Well-Known Member
The attached data provided by Mike at Calton Moor was done a while ago...the bullets I use are still the same, but the 110gn AB is now propelled by a different propellant giving approx. 3200fps MV.
I zero at 200yds....that puts my POI at 2" high @100yds & 4" low @ 300yds with my load...so 204 does it for me.
From my zero, 209 gives me 400yds according to the charts below... fully tested at Mikes range on 8" dia. 'gongs'.... great fun doing it too! ATB
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Being serious, that sounds quite impressive, but then i read it again. So if i translate, your rifle shoots plumb at 100 yrds then drops 100mm at 300 yards (4inch drop). What is it at 200 yrds?
Ok,so at present we seem to have a 25-06 leading the race? Drops 4 inches at 300m. I wonder if we could have a little flat round competition? Assume your rifle shoots on target, in the cross hair, zero (whatever you want to call it) at 100m. What does it drop at 200m then 300m?
.243 100g norma
100m = zero
200m = 3 inch drop
300m = ????
surely some vicious 22-250 combo round will poke its head up in this one?
.243 100g norma
100m = zero
200m = 3 inch drop
300m = ????
surely some vicious 22-250 combo round will poke its head up in this one?
How does the 25 Weatherby look on paper?
tackb
Well-Known Member
I read a 6" drop for your accubond at 300yds with a 200yd zero ?
are you sure your reading the chart correctly because the ony way i can see to get a 4" drop is to read down the column which is zero not range?
read along the 200yd zero line from left to right to get your drops at different ranges with a 200yd zero.
bewsher500
Well-Known Member
those look very similar to standard .270 factory data
1.2", 0.0, 6.3" (100, 200, 300)
John Gryphon
Well-Known Member
A shiite carter is what we call the old way of emptying the bog can before the sewer system was put on in the old days..the 'dunny man" would come and carry the bucket of shiite on his head..some of those cans were full as ticks...thus a flat hat
John Gryphon
Well-Known Member
tackb
Well-Known Member
not a massive difference between all the popular/common loads is there?
jthyttin
Well-Known Member
You're not "translating" correctly. If the rifle shoots 20mm high at 100y and you adjust the scope 20mm down, it would mean the POI at 300y moves 3*20mm = 60mm down.
A 25cal 75gr V-Max leaving the muzzle at 1100m/s would be 20mm high at 100y and 80mm low at 300y. At 100y the trajectory is still rising, the apex (sp?) would be at 155y/34mm high. 200y would be 24mm high.
Achieving this requires the scope to be 69mm over the bore, which is awfully high at least for me. I'm sure there are other combinations to the same effect, but there's no way around the high scope installation. Calculations by:
http://jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi
to be clear, rightly or wrongly I was trying to eliminate the shooting high bit quotes because they don't make sense to a simpleton like me. I am not assessing the ballistics trajectory. Also I have no idea what you are on about when adjusting scopes. Same scope, hit the bull at 100m, where's your round at 200m and 300m.
"Up a bit. Left a bit. That will do Bernie. FIRE!"
Job done.
K
Job done.
K
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