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Fellow Riflemen, what velocity should I try to make for Cowboy Action long range side match, Marlin Cowboy 45/70. I've got AA 5744, IMR 3031 and Trail Boss. I will be using Missouri Bullet Co. .459 405 grain Brinell 18 bullets. Thanks.
 

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I wouldn't worry about the speed, know your bullet and it's trajectory and learn the hold-over.
 

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The old black powder load was about 1350fps. That would be a good place to start.
A5744 for higher velocities, Trail Boss for lower velocities.
Your main problem will be getting a sight with enough elevation. A 405 at 1350fps zeroed at 100yd will drop about 81inches at 300yd.
M.
 

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i think either lyman or marbles still sells a tang sight for them. a nice vernier sight would be a good addition
 

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Both Marbles and Lyman make them along with Montana Vintage Arms, Buffalo Arms and a host of others make Long and mid range sights for most any rifle you want. Some of them can cost an arm and or a leg though. The sights on my 1874 Sharps were about $525.00 but is a very good set.
 

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My Springfield Cadet (Trapdoor) Rifle of 1884 has the sights registered for the carbine load of that era.

That is a 405 gn hb bullet on top of 55 grains of black powder.

It makes about 1300 fps

The "battle sight" setting for this is about 250 yards.

As stated in a previous answer, you should aim to duplicate the old time loads and see how you go from there.

The long range boys accurately shoot at 1000 yards withthe 45-70.

Chris
 

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Hey there Doc -- I'd consider getting an accurate load in the 1200-1500 feet per second range. Then get a tang sight and dial in various yardages and eliminate any need for holdover. A standard Marbles will reach just fine. Here is a video of Wet Dog with a Marbles on a 20" barreled 32-20 at 500 yards with a dead on hold. My old rifle has a Lyman, but if you're buying new I'd recommend being able to adjust for windage as well. Hope this helps. Best regards. Wind

http://www.marlinowners.com/forums/index.php/topic,93195.0.html
 

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I shoot 200m gongs with good accuracy ou of my 45-70 (cowboy with 22" barrel). I use 40gr of IMR-3031 for a load that duplicates BP velocities. I'm quite confident that my particular sight combo would allow for a 300 yd setting. It's a Lyman 17 up front and a Williams FP in the back.

Chis.
 

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Here's some Video of Wind and I ringing the 400 yard dinger with a 405 grain Laser Cast bullet over enough Unique to get it going 1175 fps in his rifle (1895 LTD II) and 1150 fps in my Cowboy

http://www.youtube.com/watch?v=_Oas1ApY6qo
 

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Hi Doc

I shoot a CB with a 24 inch barrel, my load is a 392 grain bullet over 27 grs. of 5744, Remington brass, CCI LR primer, which gives me about 1450 fps. I have shot it off hand out to 800 yards it will easily reach that range. So I would say load the 5744 down abit maybe 22 to 24 grs. with that 405 gr. bullet and you will have no trouble getting to 300 yds. Having said that I must also say I have a MVA vernier rear sight and a lyman 17 A on the front. You have to remember once you start almost an ounce moving downrange it carries a very long ways you just need the sights to make it work.
 

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Start at around 900fps (300yds a second) at 50 yds then work up your load until they all go into the same group.
 
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