@Rick H I'm still loving my AR250 too.
I do have my own 'ideas' of the best way to run it though. But we all do that don't we?
In standard form it shot well...absolutely no problems.
But I didn't like the thought of the 2 extending columns being set too high when adjusting for height.
So I prefer to set the columns low and set the three adjustable screw legs higher when setting the initial height. However I only shoot at a set 25 yard range so this presents no problem doing it 'my way'.
Then I had another think about it, and figured maybe a tad more weight might help now the whole rest sits higher it won't hurt to add some weight down lower.
So I had a local laser cutting guy make me a 1/4" thick steel plate to add the weight. It adds ~3lb extra and sits under the base.
I've shot the rest both with and without the weight. With the weight it just 'feels' more solid and 'planted' to me. There is the added bonus (maybe) that the flat washers and M12 nuts that hold the plate on are also firming up the extended screw legs (just my theory).
I now run the smaller (inner) height column fully down, and the larger outer mariner wheel column is only about 1/4 way extended.
Too early to say if the weight helps or hinders. The rifle sits well still, the rest doesn't move once set, when I do my bit 'right' the scores are still good. I just feel more comfortable with the added weight on the rest...although it does sort of look like its on stilts.
Chris (SEB) advises that he will be making a weight plate at a later date to keep other people like me happy.
