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Combating rifle tilt after firing?

I notice that sometimes after a few shots I will have to adjust the tilt of the front rest (Seb Mini with Bryan Blake Upgrades).

By tilt I mean the bubble level on the scope is off from center, it isn't much but it is enough to notice. My rear bag is a "PROTEKTOR DR. BAG WITH CORDURA EARS". I do make a note to lift up the butt stock and pound it down into the bag a few times and try to do the same with the front bag as well but I still get that little bit of movement. This is with a:
Manners T5A with a FOREND BENCHREST ADAPTOR from brownells but I had to take the sides off because it wouldn't fit that way and I drilled 2 holes it in to fasten it to the rifle reusing the bolts and holes for the atlas pic rail.

And a XLR with bag rider (https://xlrindustries.com/collections/accessories/products/tactical-bag-rider) and (https://xlrindustries.com/collections/accessories/products/bench-rest-guide-plate). I use the bag rider with the flat side down not the sloped part.

Any tips to reduce this? Do you think its a bag stiffness issue or a Seb Mini Issue or perhaps an inconsistent cheek pressure issue?
 
Front rest bags tend to bulge in the center so if your forend adapter is flat, it will rock on the bag.
Look for a forend adapter that has the dual skip format. The skids ride in the end corners of the bag and the recess of the adapter does not touch the center of the bag. Torque from the recoil will inherently cause the rifle to twist at some degree but with stabilizing the sides of the adapter, it will reduce to a degree or not cant at all. This is why a lot of F-open shooters inlet the bottom of their forends to stabilize the rifle a bit.
 
Are you using Bryan's 2 piece bottom bag? Bryan makes those as well to combat your problem.
 
Unless that forend adapter is bedded and very securely fastened to the stock as in aluminum or steel inserts bedded into the stock youre going to have movement there
 
Front rest bags tend to bulge in the center so if your forend adapter is flat, it will rock on the bag.
Look for a forend adapter that has the dual skip format. The skids ride in the end corners of the bag and the recess of the adapter does not touch the center of the bag. Torque from the recoil will inherently cause the rifle to twist at some degree but with stabilizing the sides of the adapter, it will reduce to a degree or not cant at all. This is why a lot of F-open shooters inlet the bottom of their forends to stabilize the rifle a bit.
Like this: http://forum.accurateshooter.com/threads/3-front-bag-rider-for-picatinny-rail-rpr-ar15-etc.3957175/

I will have to see if the pic rail for my stock is long enough to support that.

Edit: Looks like it would. The creator of that rider has the following in the description "Fits the 3"long 7 slot bipod picatinny rail typically found..." and the rail for my rifle is indeed 3" long with 7 slots.
 
I notice that sometimes after a few shots I will have to adjust the tilt of the front rest (Seb Mini with Bryan Blake Upgrades).

By tilt I mean the bubble level on the scope is off from center, it isn't much but it is enough to notice. My rear bag is a "PROTEKTOR DR. BAG WITH CORDURA EARS". I do make a note to lift up the butt stock and pound it down into the bag a few times and try to do the same with the front bag as well but I still get that little bit of movement. This is with a:
Manners T5A with a FOREND BENCHREST ADAPTOR from brownells but I had to take the sides off because it wouldn't fit that way and I drilled 2 holes it in to fasten it to the rifle reusing the bolts and holes for the atlas pic rail.

And a XLR with bag rider (https://xlrindustries.com/collections/accessories/products/tactical-bag-rider) and (https://xlrindustries.com/collections/accessories/products/bench-rest-guide-plate). I use the bag rider with the flat side down not the sloped part.

Any tips to reduce this? Do you think its a bag stiffness issue or a Seb Mini Issue or perhaps an inconsistent cheek pressure issue?
Canting of a rifle is more common than you think.
Cant can be caused by the shooter rather than a fault with their rig, ie rough operation of the bolt, grabbing the stock with your hand before or after you shot.
Hard bolt lift from hot loads will cause the rifle to twist in the bags causing cant.
 
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The rest might be settling into the ground. I have watched many shooters use a dead blow mallet whack the feet on their rest to get the feet settled into the ground. The feet may cause the rest to cant.
 
The rest might be settling into the ground. I have watched many shooters use a dead blow mallet whack the feet on their rest to get the feet settled into the ground. The feet may cause the rest to cant.
I practice on a wood bench and compete on concrete so I don't think that is an issue.
 
One thing that can contribute to a cumulative sand shift in the front bag is how the bolt is opened. Shooters who grab the bolt knob and lift it to open the bolt rock the rifle and that shifts sand in the bag. How do you open your bolt?
 
might try reducing the drag of the stock against the bags. teflon tape and/or waxing the stock/tape is something I do. might help, might noto_O
 
Thank you ,Vera Carters wind reading Videos are
Very informative,
J
 

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