casspir,
there are still gunsmiths in the UK offering the Musgrave RSA action as an option, although I wouldn't like to say how many are actually built - not that many I'd imagine. The RPA Quadlock and Barnard Model P have largely replaced the Musgrave in 'Target Rifle' in the UK - a shame as it is a very good action for this discipline. There are many older Musgrave TR rifles still in use here, but usually relegated to beginners or long-standing impecunious owners. You can buy a complete rifle cheaply if you find one for sale.
Equally, I think it would make a reasonable basis for an F/TR rifle, but I can't think of anybody using one on the GB FCA national circuit. The pros are it's a proper single-shot action with a heavy gauge tube receiver and small port so good and stiff; short lock-time; good trigger, tried and tested improved Mauser design; well-made so everything usually true with the locking lugs bearing properly, and cheap. The sole minus I can think of is the twin lug bolt with the lugs at 6 and 12 o'clock when locked, which is known to be more affected by pressure variations in cartridges than 3-lug Delta form designs such as the Barnard and 4-lug models such as the RPA. However, people have done very well with the not too different and mass-produced Savage Model 12 single-shot Competition action based rifles in F-Class and other precision disciplines, and many American custom actions are 2-lug too, but I'm told that is because the longer bolt-throw needs less pressure to compress the mainspring and so allows faster, smoother operation for benchrest.
In the UK, the Savage 12F in 6.5-284 Norma has been the Factory Sporter class rifle to beat in 600 and 1,000yd BR. And ..... it's not as if they shoot way behind the custom 'Light Guns'. The best of the Savages are only just behind the rifles with custom actions. Team Savage members did really well in the F-Class World Championships at Bisley last summer in the F/TR division too, including being half of the winning 4-man team in the Team Shoots. So, if one gets these results with a Savage, I don't see why you won't with the RSA. Anyway, think of all the F/TR rifles around especially in the USA that are built around magazine feed Remington 700s complete with horrible big holes in the middle of the receiver, both top and bottom!
So, unless anybody else comes up with a strong argument against, I'd say go for it. Oh, I did own a Musgrave RSA - it was my last TR rifle before my eyes weakened to the point where I gave up on competition involving iron sights. It would far outshoot my abilities and I was very fond of it. 10 years on, its current owner says the same thing about it. despite still having the same barrel with goodness how many thousands of rounds through it - can't think of the barrelmaker's name, but Australian, button rifled and stainless, used to be very popular in TR here before Border, Krieger and now Bartlein took over.
If you want to get the views of some very technically gifted people and those with a lot of experience of building rifles with this action and dealing with any repairs or remedial work, I suggest registering with the Long-Range Target Shooting Forum which is on the US Palma team's website, if not already a member:
http://www.usrifleteams.com/lrforum/
and asking the same question there. However, watch out for sparks if you do! Every time a discussion about action design starts up, it ends up as a bar-fight that spans France, Australia, and the USA.
Laurie,
York, England