I haven't experienced this. I think it was only the 315M that folks were seeing affected, and only in the presence of a faulty ring with in excess of 25 in/lbs of force. This issue was created due to faulty rings (mostly) and rings with odd design features (in part) which in combination put strange pressures on the scope tubes. Essentially clamping the scope tube and bending it out of round in very specific places. These types of rings are an issue with nearly every scope made, though very few want to acknowledge it.
I even have a few of my 315M's mounted with 25 in/lbs in quality rings from before they put out the 15 in/lbs notice... and they still work fine. They certainly don't recommend it. Especially with faulty rings. (and there are more faulty rings out there than anyone wants to admit)
As per usual in these types of situations, I won't say which ones to avoid, but I'll say that I use Hawkins rings on everything these days, and in most applications I'll opt for the 6-screw "extreme" models. It's worth the extra couple ounces. Obviously those are unavailable for the 30mm tubes, and generally speaking I'll run the 5-25 or 7-35 for big game hunting on a magnum anyway. Yet, I've been running the hawkins lightweight alloy 30mm sets for a lot of years now and haven't had a 315M move yet when run at 15 in/lbs.
However it's important to note that I don't make a habit of carrying around 7lb 300 Ultra Mag rifles either. My hunting rifles weigh on average 11-14lbs. Were I in that situation, I'd buy a second set of rings and run a 3rd or 4th (if room) ring on there. From my experience, if the recoil is high enough, and the rifle light enough, there's not 4-screw top ring made that will hold a scope with just 2 of them. Not unless you legitimately epoxy the tube to the bottom ring half. So doubling up, is the best way to handle extreme situations. I recall nightforce making a set that has 8 screws, or basically 2 rings, joined up at the front. I think I recall badger doing one like that as well. So in the heaviest recoil situations, I'd be taking drastic measures. A guy that only shoots it 10 times a year could probably just run a normal setup... but if you expect the scope to stay put with repeated use with that kind of recoil, it MUST be mounted firmly.
Regarding the Tangent Theta scopes themselves, they are at the tip of the pyramid in every respect. There is nothing better out there at this time. We keep them in stock always.
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