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Posted: 9/16/2013 2:46:20 PM EDT
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Ok, So I picked up a Millet TRS 4-16x and mounted it on my Hogan H308 with a Burress QD Mount. I used M80 ball ammo for the sighting in as it was the best price I can find at the moment for the amount of rounds I wanted to shoot (7.62x51 brass). I went to the range and began sighting in the rifle at 100 yrds, I shot 3 rounds to get a grouping. One at 7 o'clock, 5, and 12 all about 4 inches from center. Shot a few more rounds all pretty much dancing around the target at 4 inches out.. eventually there was enough of a group that I was able to start making adjustments. I would get the scope almost to zero.. then upon reloading and going back to shooting, rifle was waaay off again, so I was thinking maybe cheek weld. Moved the target to 50 yrds to see if there was much of a difference. Once again, get close to zero / reload / way off upon return. Is it even remotely possible to have that much of a shot difference from cheek weld (4-8" @ 50yrds)?
I would also like to mention that I have held 3 state championship titles for prone shooting (iron sights) and this is not a case of improper trigger pull or shooter error. That is unless cheek weld with a scope is the real issue. But even still I was on a bench with a bipod and if my cheek was moving it was not that extreme. The zeroing on my Aimpoint went fine and holds zero upon remounting every time. (LaRue Mounts). So I know there isn't a defect in my rifle, plus its relatively new. Do you think this could be the Burress mount not living up to its use? It seemed to be very sturdy while mounted but I did notice sometimes that the front lever would not be completely engaged after a magazine was spent, but even still the mount was solid. Could the slight pressure of me pushing the lever mount back into place move the mount enough to cause the zero to fall off that bad? Is this an issue with the scope itself? Or is M80 ball just terrible ammo for what I was doing? I never heard of any ammo having such an impact zone at 50 yrds. I just was hoping some of you could help out as I do not have much experience with scopes. Brand loyalty aside do you think I should just get another LaRue mount or is the scope a dud? Rob |
| Ball ammunition isn't going to perform like match ammo. That said, I would look at the rings and mount to make sure everything is tight. FWIW- I had an accuracy issue with a rifle with scope. Shots all over the place from a rifle/ ammo combination that routinely groups under .2". Scope seemed solidly mounted, but when it came to take it off to check things out, the rear ring was loose on the rail. |
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Right, I knew the Ball ammo wouldn't be perfect for what I was doing but at the same time I don't think there would be a 4-6" difference in shots from 50yrds from just ammo alone. There were times the difference in shots could have been 8-10" We even lost the paper at one point. So the issue seems to be either the mount or the scope. I attached an image of the scope on the rifle and you can see the mount is one piece and the rings are on good and tight with 20in/lbs on the screws. I am kind of at a loss as to what could make such a big difference in the setup.
http://img28.imageshack.us/img28/8281/q03l.jpg |
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Yes Barrel is free floating. The rail is on tight.. checked that out too. Everything is torqued to specs. When I say the mount needed tightening I just want to clear up that the levers were not at 90 degrees maybe at 75-80 but tension was still on the rail. As I mentioned as well.. when I mounted to the Aimpoint on there it was back to its zero so I knew that the rifle wasn't the problem. As far as being as good as I say, I am currently in question with where I was hitting!!! haha
The rifle is a Hogan H308.. full specs can be viewed here: http://www.hoganguns.com/h-308/hr308SA-18.html |
| Yes, heard of people having issues. Didn't want something too expensive because I really don't need something crazy for this setup. Also read about people having issues but the scope seems very solid. Nothing seems broken or loose from what I can tell. I am hoping its not a return, although I always have that kind of luck. |
I've witnessed similar accuracy issues twice. Once the wire reticle came loose (cheap scope). The other time the base cam loose on a bolt gun.
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Ok so had a little time to go back to the range. Picked up some Hornady 168gr Match ammo to be certain I was getting accurate shots. Good news for me is that the scope is solid and turns out the Burris P.E.P.R QD Mount was the culprit. The image below and description shows exactly what was going on.
Small Center bulls were used for when I would tighten the levers on the mount to be sure the mount wasn't moving too much before moving on to next bull. -------------------------------------------- Blue Square 1 & 2: 15 rnd Magazine. Blue Sqr 1 Shots 1-3 were first shots upon remounting the scope, all seemed well. Shots 4-8 further sighting and generally happy with where I am. Shot 9 -- shooter error Blue Sqr 2 Shot 10 - right where I want it Shot 11 - 13 things are starting to move and I am figuring something is wrong again Shot 14-15 -- Exactly what I was experiencing.. for no apparent reason the sights are completely off and upon checking the mount I noticed that the levers have become lose (75-80 degree angle vs. the appropriate 90 degree) -------------------------------------------- Blue Square 3 & 4 -- Reload and retighten the levers, this time as tight as I can go without causing damage or concern. 15 rnd Magazine Blue Sqr 3 Shots 1-3 are noticeably back off zero after tightening Shots 4-5 after adjustments. Blue Sqr 4 Shots 6-10 all are right where I am happy I check the mount levers and push them in to be sure they are tight and they were a little lose, rechecked after tightening using small center bull seemed to be ok. --------------- Zeroed In --------------- Red Squares 1 shot each. 1-4 are solid - levers on the mount are starting to look loose but I want to see the result. 5 & 6 - obviously low and mounts are looking like they are close to 75-80 degrees The bottom 2 dots were actual shots and were completely off paper mounts were loose.. at this point I knew exactly what the problem was. Case Closed!! Ordering LaRue mounts today. Hope this description helps anyone else out that may have similar problems! http://img822.imageshack.us/img822/8072/fvwg.jpg |
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