For all the folks here who seem to be a bit bewildered and confused about Ruger's #1 Models here they are:
1-A: This is the model called the Light Sporter. It has a 22" barrel with iron sights and an Alex Henry forend (Yes! That's the one with the groove in it...) Weight: about 7 1/4 lbs.
1-AB: This is also a Light Sporter , but has NO iron sights and a semi-beavertail forend. (Kind of a cross between the 1-A and the 1-B) These were made from 1981-'83 and disfontinued when the #1-RSI was introduced...
1-B: This model is called the Standard Sporter. It has a 26" clean barrel (No sights) Wieght: about 8 lbs.
1-S: This model is called the Medium Sporter . It has a 26" barrel with sights and Alex Henry fore-end. Chamberings Were : 7mm Rem Mag, .300 Win Mag, .338 Win Mag, and .45-70 Gov't... .45-70 has 22" barrel. (Recently the .338 RCM and some pistol chamberings were added with 22" barrels...)
1-RSI: This model is called the International model. It has a 20" barrel with full stock and sights. (.243 Win, 7x57, .270 Win, and .30-06)
1-H: This is Tropical rifle. It has a 24" Heavy bbl with sights. Calibers: .375 H&H and .405 Win. in a fairly heavy barrel. (Weight: Just over 9 lbs.) and .416 Rem, .416 Rigby, .404 Jeffery, .458 Win Mag, .400/.450 Nitro Exp., and .450 NE. w/ Very Heavy barrel (About 10 lbs.) (Also has Alex Henry for-end)
1-V: This is the Varmint Model. This has 24" heavy barrel with beavertail fore-end in .223, .22/250 .243, 6mm Rem, and .25-06. 26" heavy barrel in .220 Swift. (Back in the '70's, a few 1-V's were produced in .280 Rem, 7mm Rem Mag, and .300 Win Mag... ) Ruger catalog lists the weight as 9 lbs, but I believe they are heavier than that. More like: "God-Awful-Heavy"...
Hope this helps some...
GH