Biologist, you have me thinking about aperture sights.
I see you have the 6384 aperture sights. Knowing what you now know, if you were buying the sights today and of course if the price difference were not an issue, would you stick with the 6384 set or get the 7020 set? Which iris aperture would you recommend? Other than the sight line extension for benchrest, would you make any other recommendations?
Hi Grauhanen. I started writing and ended up with an overly long-winded response, so please excuse the verbosity of it all.
It is so long the software made me divide it into two parts.
PART 1:
Re: Question of rear aperture sight choice 6384 set vs 7020 set, if price was no object:
I bought my sights at Nordic Marksman (they have excellent service, one of my favourite stores), and they offer sights as a front and rear set, and separately. Knowing what I know now, I could select parts separately al la carte. But if in doubt, the sets are a good option, and I think they offer a discount for the set.
Also at the time I was focused on Anschutz brand, but of course there are several other excellent brands. I think the industry has standardized threads for accessories such as irises to fit each other's brands, but I am not totally certain about that.
Before I start, I must say that Anschutz number product codes for everything drive me crazy. I wish they had a more functional model name, or a comparison of features table in their catalogue or something. A major hurdle to buying anything Anschutz is just learning to keep all the number coded models and sets separated in your mind for the features. I had to write out detailed product codes and descriptions in my notes when I was making purchase decisions to keep track of what the heck they all mean! Examples below in my response.
REAR SIGHTS:
The 6384 set comes with the 6805 rear sight (already we see two different bloody codes for the same rear sight in a set vs separate purchase!). The 6805 has 10 clicks per revolution on the turrets, and at 50m that is 2.0mm on target. The 7020/20 set comes with the 7002/20 rear sight (that is not a typo: 2 more different product codes for the same sight!), with 20 clicks per revolution, which is 1mm per click at 50m, and this sight rotates for cant. For positional shooting I see videos and product photos of shooters setting up their buttstocks and sights with alot of cant to fit their unique preference. If one day I get into competitive positional shooting, I may have to go that route but for now I will have to manage without the rear sight cant feature. The 7020/10 set (with 7002/10 sight) comes with the 10 clicks per revolution and 2.0mm clicks at 50m.
With some experience, I now notice the coarseness of the 2mm clicks at 50m. Originally I thought that I would never notice the difference between 2mm vs 1mm clicks because (a) I am not that good, and (b) that dimension is well within the group size variability of the ammo, and (c) if there is wind its going to open up the groups anyway. However I was wrong in this logic for the precision of bench rest shooting.
Bench rest shooting with good ammo and a good rifle and solid support in the bags can be very precise on target. (e.g I was successful in the five 1/2 inch groups 50m challenge with apertures using SK Biathlon Sport ammo). Even though 2mm is just a wee bit tinier than 1mm, the error it induces is 1mm additive to the ammo's dispersion. There have been perfect no-wind conditions where I center the black bull in the white halo, then ever so slightly have to cheat (hold) one way to compensate about 1mm for the "gap" of the 2mm clicks that I am seeing printing on paper through my spotting scope. The ISSF 50m X-ring is very small, and the 10 ring is also not generous, and every mm matters for the 10-X scores. So in hindsight I do see the advantage to 20 clicks per revolution with 1mm increments at 50m for bench rest shooting.
Short answer to the original question: If money was no object, Yes, I would buy the 7002/20 rear sight in the 7020/20 set. The 1mm clicks at 50m is better for precision than 2mm clicks.
So I am learning to compensate with the ever so slight cheat (hold). I think you need to hold anyway for windage variation when watching the flags to make an instant correction at the trigger pull when the switching is too quick to make a mechanical click or two. Same as shooting with a scope - hold for the correction at the moment of trigger pull while watching the flags with your other eye. So in the long run the 1mm click advantage at 50m with the more expensive unit might be able to be compensated for with sighting skill and wind reading skill. Without wind reading skill you are done for anyway.
The elevation slight hold, if needed to fill that 1mm gap between 2mm clicks is sometimes needed, if the wind is not overpowering it. And sometimes I cannot tell if my clicks or anything worked to improve score because of the ammo dispersion that is a rimfire fact of life anyway, especially with mid grade ammo.
I have yet to try classic 3-positional shooting unsupported where my rifle will be shaking and group size will open way way up. I doubt that the extra money for the 1mm clicks at 50m will be of any benefit since my induced error will be much larger and more variable.
Rear Sight Iris addition:
The standard rear sight aperture that comes with these Anschutz units from the factory is a 1.1mm aperture. If that is all you have you will be fully functional, good to go. I wear eyeglasses and have a problem with getting close enough to the aperture to get the full sight image, and that is why I mentioned in previous posts that I need to press my eyeglass lens onto the aperture.
I bought the Anschutz 5-colour iris rear sight aperture 9560. I am glad I bought this for the adjustable aperture. The variable light conditions make a difference in the sight picture for my eyes. In my limited experience so far, I find it does amazingly control the crispness of the black and white rings in the sight picture.
So far, my typical adjustment range for the rear iris is between 1.2 and 1.7, with 1.4 being what I use most of the time at 50m (I have not yet tested this at 100m). I think the larger opening also offsets the disadvantage I have with my eyeglass lens increasing the aperture-to-eye distance.
So far I am not using the colour filters and simply use the clear view. I did try the yellow filter which improves contrast on dull days. The other colours significantly darkened the view and I did not like these. (Maybe for indoor fluorescent lights these various colours are useful?). So if I was going to purchase a rear iris today, I might save money and get the one without the colour filters since I am only shooting outdoors and need all the light I can get, and if it is super-bright, the iris can be turned down to darken the image.
Part 2, next post are my thoughts on the front sight.......