For those of you that own one. How do you find the accuracy and more so the repeatability (i.e) does it ever loose zero on you ??. I have one here and when zeroed it shoots as good a groups as my zeiss but getting it to hold zero longer than 12 hours isn't happening. Thats twice now ive zeroed it and twice ive gone out at night only to miss rabbits. When i re-checked the zero it was up to 4-8 inches off !!