Have a look at this guy shooting a Savage. It has a good angle from the front and you can see the rifle hop left with every shot. (It starts at 1:30 minutes into the vid.) In a lighter rifle this is more pronounced. The lighter the rifle the quicker the rifle accelerates under recoil and the more the barrel has moved to the left before the bullet exits the barrel. With a heavy long range target rifle you hardly notice this, but it is more of an issue with a lighter magnum rifle like a 300 WM in a Sendero. Other things affect it too, like the hard surface he is on, but the results are pretty much the same.
Theis' method of holding downward pressure on the front part of a rifle sling is a good method in the field. Just need to learn to be consistent with it.
This is also why groups usually tighten up if you move from a bipod to to sand bags or and adjustable padded front rest. The bags and rest tend to stop the left movement you see in the vid below.
[ame]https://youtu.be/fqWvv7j_M3o[/ame]
Theis' method of holding downward pressure on the front part of a rifle sling is a good method in the field. Just need to learn to be consistent with it.
This is also why groups usually tighten up if you move from a bipod to to sand bags or and adjustable padded front rest. The bags and rest tend to stop the left movement you see in the vid below.
[ame]https://youtu.be/fqWvv7j_M3o[/ame]