The load Hoot is refering to is for the Armi Sports Spencer rifle with the 1 in 20 twist we have been yousing it now for nealy 2 years and is extreamly acurate,as it was Hoot that came up with the load I will let him give it out again,but I will explain why it work .For best acuracy you need to know groove diameter of your rifle (56-50 AP is .512)Twist rate(rifle is 1 in 20 carbine is 1 in 26)you can not change this but there are two other varibles you can change BULLET LENTH and VOLOCITY ,It works out well whith the 56-50 cartridge as the OAL of the cartridge dictates if the bullet lenth is longer the pouder charge is reduced hence the optume stability of the bullet is reached,to work this out it is best to have a chronagraph,I will give you a good load for the AS Spencer carbine as an example ,first BULLET ,a buffalow arms JIM515-440 .92 inch long bullet to get this to its best acuracy you will need a volicity of 674 fts,this is the catch in the carbine,to get that velocity and keep the OAL right you will have to heavly compress the BP,smokless will not be a problem(rembber to yous a compresion die to compress the BP to the right depth,do not compress with the bullet as this will distort the bullet and ruin acuracy)this load will be as acurate as you can get,rember if the lenth of the bullet is reduced the volocity has to be reduced also to levells that people will find extreamly slow but acuracy will improve a hell of a lot,you get nothing for free and you will never be able to duplicate the originals acuracy with the same weaight bullet and volicity unless the twist rate is changed but you can still have a very acurate low velocity target load,you will just have to judge bullet drops better