Location: Phoenix AZ
Greetings Optics Talk. New member here. I'm the one who used the SS 10x42M in the Precision Rifle class in this thread. I've had this SS for several years and thought I'd give a long term review with my thoughts and observations, plus ask a few questions on some things about it.
I bought the SS 10x42M back in June 2000 when they had the Tasco name. I bought it from SWFA for $325 plus shipping. Its entire life it's been mounted on a Remington 700 LTR in .308. The mounting base has been a 2-piece Leupold standard set, with Leupold high rings. The rings were lapped with a Sinclair ring lapping tool. After the recent Precision Rifle class, I decided I need more elevation because I ran out of clicks at around 1125 yards, so I'm in the process of switching to a 1-piece 20 MOA tapered base.
Executive summary: This is a truly great scope for the price (which is no surprise to anyone). Over the years it has served me well with great performance, reliability, and consistency. My observations:
Image is clear with no degradation of clarity on the edges. Admittedly I don't have any expensive scopes to compare it to, the only other stuff I have (or had) was a Trijicon TA11 and a TA31 which obviously are entirely different animals. But to my untrained eye, the SS optic has nothing to be ashamed of, especially at this price point. From 600 yards at the fixed 10 power, I can make head shots in the cranial occular cavity of a Front Sight target.
The click size is consistent across the entire range of adjustments, i.e. it's the same at the extremes as it is in the middle. Both elevation and windage.
It always returns exactly to zero no matter how far I wind the turrets. It passes the box test with flying colors.
The focus adjustment stays put, even though it has no locking mechanism. There's a fair amount of resistance in turning the eyepiece, so after getting the right setting, I just put a Butler Creek cover on it and it doesn't move.
The owner's manual has conflicting info. On one page it says the click adjustments are 1/4 MOA, while another page says they're 1/4 inch. So which is it? My personal feeling is that they're in MOA, not inches.
Likewise, the manual says the total amount of adjustment in both elevation and windage is 120 inches. I think it should say 120 MOA.
THE BIGGEST ISSUE: What is the true click size? I don't believe it's .25 MOA. Instead, I believe it's closer to .275 MOA. Here's why: A long time ago I did a box test at 100 yards where I gave it +/- 60 clicks in elev and wind, firing 3-shot groups at each point. After carefully measuring the group centers, I concluded that the click size for both elev & wind was .275 MOA.
Now let's assume there is 120 MOA total travel in both directions. That means there should be 480 clicks end-to-end, right? Not on my scope. For elevation end-to-end there are 438 clicks before you hit the hard stops. For windage there are 441 clicks end-to-end. If we believe there are truly 120 MOA total travel, then we get for elevation: 120 MOA / 438 clicks = .274 MOA/click. For windage we get: 120 MOA / 441 clicks = .272 MOA/click. This matches almost exactly my observed box-test results of .275 MOA/click.
Finally, in RONK's SS test, he noted that 80 clicks yielded around 22 inches of movement (not the expected 20 inches). 22 MOA / 80 clicks = you guessed it, .275 MOA/click!
Bottom line: Great scope but you have to learn to live with the oddball click size. I get my trajectory table from a free online ballistic calculator, then put the numbers into an Excel spreadsheet which calculates the correct number of clicks based on .275 MOA/click. If an SS 10x42M in mil/mil adjustments ever comes out, I may just have to buy it and retire this old one. But obviously I would hope the click adjustment tracks to exactly 0.1 mil!
Anyone else observe this anomaly with SS click size? Or am I completely off-base here? (nut behind the trigger)