I've been very pleased with an Eliseo B1 (Barnard Model P action) in F-TR. The only downside of this pairing is weight. A heavy target contour 30" Broughton sees me right on the 8.25 kg limit with a very light custom-built bi-pod and Weaver T36. With Gary E's bag-riding attachments on, it is a brilliant F-Open or BR rifle. I've moved onto a McRees modular stocked Savage .223 for my main F-TR rifle and will likely use the tubegun with a heavier scope and BR attachments as a club-level F-Open rifle from now on. (With the cost of rebarrelling in the UK, the 6.5-284 and even more so 7mmWSM users can't afford to 'waste' barrel life in regular club competition shooting!) At a later stage, I'll likely rebarrel to .284 Win for F-Open. It is that good a platform.
Unfortunately, we can't get any more over here in the UK for various reasons. If we could, I'd have had an S1 Savage 12 version without a doubt. They are pretty rare animals here - I doubt if we have more than a handful of MAK or Eliseo stocked rifles in the country. On the other hand, there are more TUbb T2Ks (not tubeguns, but same layout) than you might imagine amongst our Service Rifle shooters despite the frightening cost of importing them.
Laurie,
York, England