Pad under the barrel at the tip of the foreend - experimenting with different locations and different pad thickness (changing the amount of upward pressure and the location of it) can reduce the gap. But in this case, one option works rather well so if that does it for you why stuff with it?
Although it would be interesting to note the grouping with the cans off - and see what the difference is. It could well have some form of bedding dislike given that the heavier option improves things over lighter or the action screw tension or stock stability could be factors. There's lots that could contribute to this, how much ammo do you want to burn up and how many notebooks do you want to fill up experimenting which is really the only way to get a handle on whats going on.
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