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Well if you use the A307 and a new set of bolts, you are still decreasing your moment arm, so yes the A307 will see more load.
Assuming you have a perfect couple for your two anchor bolt example, your applied moment which has the units of force*length will be equal to the unknown force in your anchor bolts multiplied by the distance between the anchor bolts. Therefore, when you have a smaller distance between anchor bolts, the load is higher. Move your anchor bolts out, and their loads will go down.
Assuming you have a perfect couple for your two anchor bolt example, your applied moment which has the units of force*length will be equal to the unknown force in your anchor bolts multiplied by the distance between the anchor bolts. Therefore, when you have a smaller distance between anchor bolts, the load is higher. Move your anchor bolts out, and their loads will go down.
The example with the 4 bolts is more complicated, but essentially the outer ones are further away from the neutral axis and therefore see a larger share of the load. Imagine if your bolts were right in the middle spaced very close, you could imagine that this would not be very helpful to keep something (column) from tipping. Its the bolts applied closer to the edges of the base plate that will resist the overturning (moment).
If you have a set of anchors and add more anchors towards the inside, the moment arm changes, and the loads change. Thats what I was getting at
If the moment is left to right on the picture you posted, with the extra holes, the NA moves a bit, I would design using the NA of the original holes, & the extra holes.
Going back to the original post, how do you know the A307 are not adequate for the load? Do you know the load?
You need to get a competent engineer involved, and based on your other post, that does not involve the company you are dealing with now. This is basic engineering, and if they cant get this right, the rest of the building is in question.