One of my very favorite things to do is to shoot my 44-40's at extended distances.
Back in 1875, Winchester claimed that their 1873 Winchester was effective and accurate out to 500-600 yards and based on what I have witnessed, they were definitely speaking from experience.
Here's a video I took recently with my camera (I need to get a good movie camera....perhaps for christmas) at Ridgway Rifle club located in Ridgway, PA. My apologies for the background noise which was due to the wind.
The steel javelina targets are the second group out. They stand 300 meters (327 yards) distant from the muzzle. They are 9" high x 22" long.....a bit thin on elevation but good on windage.
Ammunition was handloaded to replicate the early 44-40 factory black powder ammunition which developed 1,300 f.p.s. Powder used was SWISS FFG pushing a copy of the original 2 groove bullet...the Ideal / Lyman 427098*.
STATS .... bullet flight time - .94 sec / impact velocity: 800 f.p.s. Rifle shot from a rest.
The 44-40 / ammo combo did a great job....especially in the conditions that day!
Here's the video. I was shooting at bank 7. Go to full screen to get the correct view (left click bottom right in the movie frame / ESC to return). Again, my apologies for the wind noise http://www.youtube.com/watch?v=rbxvlQUkQfU
*Bullets made from Accurate Mold 43-210B (Fairshake development) .429" diameter / flat bottomed lube grooves http://www.accuratemolds.com/bullet_detail.php?bullet=43-210B-D.png