Feel I have to add to this even though it's an old thread.
I have a Simon Lawrence rifle in .243, though it's stainless rather than titanium. The action and bolt are all custom billet machined, not sure on barrel brand (I did know), but it's good.
The rifle was made to fire 70gr rounds. It sends 75gr nicely enough, but doesn't like 100s, 58s or 55s. I have a 70gr Nosler ballistic tip load using Stoball 6.5 that groups about 1/3". If I could get Varget it would give one ragged hole.. It did spread lightweight (under 60gr) rounds at least 2 inches - but it didn't claim not to.
The finish is exquisite, short lock time, lovely feel, gorgeous bolt movement, real 'breaking glass' trigger, and a lovely shotgun-style safety. It's bagged me plenty of golden jackals at good ranges and I wouldn't swap it for anything.
Just had to comment after reading this thread.