Golly, I may be off in my estimation that the globe is going to be too high. I took my 40-65 Browning and mounted it in a cleaning vise and bore sighted on a telephone box at a little over 200 yards. Made a good target (I didn't shoot it!). Then I set its tang sight for 300 meters and noted where the sight was setting relative to the phone box. Then I mounted the Alexander Henry and bore sighted it on the phone box. I raised the peep on the rear tang (the detachable long rang one) until it was aiming at the same spot as the Browning's tang was when set at 300. I looked at the setting of the tang sight and it was at 300! The tang is marked in yards so it may all work out. Got to shoot it!

Some very nice looking and shooting rifles. 
Thanks Richard

Hi Tom,
I measured the twist at 18. I'll go look up Goergen's rifle. Your comments on the 577 were predictable in a light Henry - once was enough! I'm trying out the fore sight tomorrow with 480 and 535 grain bullets.

My latest research has me thinking that the rifle was originally a 450 Express (barrel number 2481) when completed in May of 1874 and that around September of 1875 it was returned for rebarreling with a "long range" (fast twist) barrel in 500-450 #2 (long range barrel number 2799). It would also stand to reason that the provision for the detachable long range wind gauge front sight required the addition of the detachable long range tang sight at that time. I keep asking the rifle questions but it is keeping a tight chamber;-)

I would have to assume that is the same rifle that oneatatime passed on at the CGCA show in September. I have no knowledge of the price he paid for the rifle he aquired, but to my way of thinking he, by far, got the better of the two, regardless of the fact the other came from Bill Ruger's personal collection. jmnsho Krag

I did finally turn the windgauge sight around on the base so it was as Davide intended. After I modified the sight insert with a little diamond grinding on the bottom of its ring (I got a Pedersoli sheet of sights that was made for their Gibbs globe front that are finer and don't have a vertical post that would have blocked seeing the bubble) I could just make out the bubble as it centered but I decided having it on the side facing me, as intended, would be better. I did have to take a bit off the bottom of the level tube to clear the front sight bead but it wasn't a problem. I also figured that each full turn on the windgauge appears to be 1 minute of windage and each full turn on the peep sight was 5 minutes.

"British Henry expert (and great, great, grandson) Richard Brown" ... not sure about that ... but I think I am an "expert" on the man - hardly on the rifles ! I'll take the compliment all the same !