Anonymous
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Moderatorer: Leopold, Nitro, atte69
I purchased a Falcon T50 in 2018-05-09. I have mounted it on a Weihrauch HW97k (spring rifle 10J) with SPORT MATCH/BISLEY ADJUSTABLE 30MM. I dialed in the vertical and horizontal adjustments using the mount to keep the turrets at mechanical centre. The vertical is at 4 and 3.5 and horizontal is at 3 and 3.5. This is at 28m.
I have been very satisfied with the scope but now the group size have opened up vertically. The strange thing is that one day everything groups in a 3cm radius at 28 meters and another day is 7 cm below with the same adjustments. BUT when is about 5-7 cm below some of the diabols are dead-center so it varies. I use the vertical turret to center it but next time is 7 cm above, so it is very frustrating that I cannot rely on the next shot.
The thing is that it is always 5-7 cm below and NOT a string of hits. I other words it groups either at dead center or 5-7 cm below.
I have shot this setup very often probably each week since i got it.
The testing was with no wind spread out over several weeks.
I shoot with support when i tested this and I shot tens of diabols for testing so it is not one-off.
As I see it there can be 4 issues:
1. the shooter (most probably). I try to keep the same form (sitting with support).
2. the rifle. I have shot with this rifle about 5000 times so the spring can be the issue.
3. the diabols. I have used the same diabols all the time: JSB Exact RS.
4. the scope. Maybe the vertical turret has some issues.
I know it is difficult to answer some of my questions without looking at the scope but i have to ask them to maybe get some clarification where the problem is:
1. Have somebody else have had the same issue with the scope?
2. Is there a test that I can do to make sure that the scope is not the issue?
3. If the problem is with the scope shouldn't groups open also horizontally?
I hope I explained so that it is clear what i mean. If there are some question please do not hesitate to contact me.
Thanks so much for the email. Thanks for the information that you have provided, it really helps.
Just to confirm.
- When the rifle shoots low then the grouping is still the same? 3cm?
- If you do not adjust the elevation turret, then the rifle will continue to shoot 7cm low?
- The point of impact changes between shooting sessions? Or within the shooting session itself?
- What torque is applied to the ring and base screws?
In answer to your points:
1) Honestly no. Not like this.
2) Maybe, let us know the answers to our questions above and we can devise a test.
3) Yes. We would expect that.
Thank you for the quick response.
> When the rifle shoots low then the grouping is still the same? 3cm?
more or less. Here is the todays result: För att följa länken så måste du registera dig.
28 m no wind with support and I aimed at the rings. You can see on the side a ruler. The most common is the one on the right where you can see 2 groupings, one around the aimpoint and one below. I tried to keep the same position and forces on the rifle.
For 2 days ago with the same turret-adjustment i had several groups exactly around the aimpoint.
If you compare with a target that i shot on 2019-01-22 at exactly the same distance you can see the difference: För att följa länken så måste du registera dig.
- If you do not adjust the elevation turret, then the rifle will continue to shoot 7cm low?
Yes it does. This is how it usually works:
I adjust the turret so that it shoots ok one session. The next session it will shoot 5-7 cm above, I adjust the turret about half a turn and start shooting ok 5-6 times, then suddenly it starts shooting sometimes 7 cm low alternating with correct precision (= on the aimpoint)
- The point of impact changes between shooting sessions? Or within the shooting session itself?
If i change the elevation turret so that is is ok for one session then the point of impact will change to the next session. When I change the the turret within the next session then one or two groups are ok then it will shoot 5-7 cm lower or above alternating with ok shots.
- What torque is applied to the ring and base screws?
I don't have a torque wrench so I cannot see the Nm but I only used the smaller part of the allen key provided to apply force for the rings (only with two fingers) and the base screws I used the longer part with the whole hand.
I forgot to mention that I keep the scope at room-temperature but shoot outside. For example today it was 7 degrees C.
Thank you for the patience and quick response.
Sorry for the delay, this got missed.
If you are shooting a spring air rifle then I would certainly recommend that you invest in a torque wrench. Without that then it's impossible to torque the ring and base screws to the required levels. On something that recoils like a spring air rifle, then that is really important.
That would be the first factor that I'd try and eliminate.
If think the fact that the movement is fairly consistent in terms of size and from one session to the next. I suspect that you have some kind of play or movement somewhere within your setup. Exactly where its impossible to say, sorry.
It could be a trial and error process in order to isolate and rectify this issue.
How much should I tighten the fasteners on my Sportsmatch® scope mount?
Ring screws (4mm thread diameter) – 30 in-lbs. Dovetail clamp screws with 4mm thread diameter – 42 in-lbs. Dovetail clamp screws with 5mm thread diameter – 66 in-lbs. Rail clamp on Picatinny / Weaver scope mounts - 40 in-lbs. Due to many variables these figures can only be used as a guide. In extreme cases some particularly heavy recoiling rifles may require higher levels of torque to be applied to the dovetail clamp screws only. To avoid damaging the screws on your scope mount please only use the allen key supplied or a suitable torque wrench.
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