Yes, it's definietly a 1905 model, and that can be a Good Thing in many ways. For one, you don't have anything in the way or worries regarding proper bolt assembly. A 1905 bolt CAN be assembled incorrectly (and believe me, it takes some doing!) but then, IF it will fit into the rifle (and that's a big IF), it won't even move back and forth. From the photos, however, your bolt is just fine.

Take her out and shoot her after you have given her a good scrub. Don't worry much about the thing being weak: Ross tried one at 100,000 psi and it held together. That was before he designed the Mark III, which was REALLY strong. "First round from the hip, with the rifle facing to my right" is my rule for testing these. I've been doing it now for just about 50 years and I still have both hands and both eyes.

THEN you settle in for some shooting. The barrels in the 1905 Ross had Ross's own design of rifling which was designed to outlast any other barrels available by a factor of about 3 to 1. And that was firing hot-loaded Cordite ammunition. The biggest problem with most of these is the fact that people shot them after they left the Service, using that same ammo...... and they didn't clean them. Modern ammunition doesn't give you that problem. For best results with a barrel that you aren't completely sure about, try ammo with a flatbase bullet so that it can obtuate on firing to take up some slop in the bore, should that be necessary. Modern Winchester and Remington both are loaded with flatbase bullets if you buy the cheaper ammunition. If you have a good, tight bore (and you can tell by inserting a loaded round in the muzzle: the case should stand out from the muzzle by about 1-8 of an inch), then you can think about some of the superduper loads with boat-tailed slugs. Best of all, of course, is loading your own. A good starting load is about 37 grains of 4895 with a Sierra Pro-Hunter 180 flatbase, bullet seated to the overal length of a Ball round. I use this as a test load n any .303 and it can be wickedly accurate in some rifles, includng a couple of my own Rosses. And it's not a hot load: well within specs.

You are measuring your barrel from the receiver ring. Factory measured them from the breech-face to the muzzle. Your barrel length likely is 28 inches, so there is a pretty good case to be made for restoration, given that you can source the parts. Be patient should you go this route; the parts are out there, but they don't all stand up at once and shout "Take me HOME!"

Good luck with your Fine New Toy.... and welcome to the club!
.