Originally Posted by Scot E
Yes, ballistic style reticles can theoretically do the same in an FFP or SFP scope assuming you keep the SFP scope at its calibrated power. Things you must do though.
1. Measure the subtentions at the calibrated power to make sure they match up correctly. It is commonly believed that they come from the manf. calibrated correctly, many of them, including some high end ones don't.
2. If you are going to use a lower power, say for example half of the calibrated power, in order to double the subtention amounts, you must also calibrate at that power level to make sure that everything is matched up. This is almost never exactly accurate and you will have to find the correct power were your subtensions are correct and mark you own point so you can return to it consistently. Many people don't realize that scope rated 5-20 isn't exactly 5-20 power. It may be 4.5-19 or 5.3-19.7. So you don't start out exactly correct and the power numbers on the adjustment knob are seldom perfect. This is one of the reasons SFP scopes are not ideal for holding over, because power adjustment affects subtension measurements whereas with an FFP scope it has no influence. Again, it can be done but you just have to be careful and know what you are doing. I personally don't like the error that is introduced by the whole concept I described and is part of the reason I first tried FFP.
Not that you specifically asked this but there are some benefits for not having to shoot on high power all the time. If there is any mirage high power can get you in trouble. I personally don't like the narrow field of view and critical eyebox that max power gives me. I also don't like the reduced image quality that you will get as the power increases. And you have this issue on most scopes to some degree. I only ever use as much power as I need to make the shot, nothing more. But this is a luxury only FFP allows, unless you are dial wind and elevation shooter, which I am not.
Hi Scott, I wish to address the above quote with, how much error
? Now I am also a fan of removing all the error you can in a long range shot. We all know errors multiply with distance. But we are talking hold over with a calibrated reticle here or a BDC reticle. The FFP users have already stated many times that this type of hold over aiming is a "better choice" for the "quick Shots" some will take at fleeing game, or game that may soon move out of sight. Most likely at closer distances. Correct? So I feel that distance will surely be held to, , is 500 to 600 yards fair?
So a reticle that is in calibration on highest power, lets use a NXS on 22X and a reticle on a 1 moa grid (NP-R1 or MOAR). At 11x it is a 2 moa grid. So at 16.5 X it is a 1.5 moa grid. Now even if you have this scope on 10 or 12 X instead of 11, or it is slightly off in calibration 1 X or so as you gave in your example. The actual amount of error at 500 or 600 yards is not much. It is indeed less than 1/4 moa. That is less than 1 1/2 inches at 600 yards. Surely you can agree that 1 1/2" is not a huge factor, and that the shooter errors implied from a "quick shot" is most likely a lot greater?
As can be seen in this thread earlier on. The guys that use FFP and know them well like to whine about "Myths" for the FFP, being put forth by the SFP users. Which I feel is a "Myth" in it self. So Is it not fair to say the above example I gave not an example of the FFP users not putting forth the entire story, or putting forth a "Myth" about the SFP's?
Also, if this miscalculation of reticles is a valid one we need to check. And I agree we need check everything we can to be the best at what we do, then are we saying that this can not exist in a FFP as well? It seems to me that it surely could. Especially less expensive offerings as pointed out by a FFP user / expert early in this thread. The difference would be if the FFP is off , it will be off through the entire magnification range and would not be correct at any one point.
For the record I am not a BDC or Hold over fan any more. I used them years ago. They are widely used with success at the distances they are intended for. But you said yourself you want to remove room for error. I do as well, for me, and many will agree, the most accurate way is to dial and hold center crosshair where you want the bullet to go. It removes all the "Error" we are talking about here with either FFP or SFP alike. And that is the fact that makes me prefer to not use hold over unless I have to.