looking for a low pressure load for my 45-70 peabody. I have only shot black powder in it.Would like to try a smokeless load I will be shooting a 495-500 grain bullet
thanks TommyAuger

2nd Frank's advice, have had good luck with both in Trapdoors and Lever Actions.  Lately using 4759, 22 grs but have used as much as 24. 4759 for the Trapdoor I load until the sights match black powder sight settings.  (paying attention to pressure signs)

My first successful smokeless 45/70 load was with Unique though.

Boats

I've shot hundreds of rounds of the Unique 10.0 gr load myself and I got that info from Trap Door military match loads that were listed before the 80's. It's a good safe and accurate load for Trap Doors with soft barrels. 

My only knowlege of rung barrels comes from the use of wads pushed down on the powder (I'm one of the people that I know about   ) but, not from light loads. I shot thousands of rounds of 12.5 grains of 296 Winchester in my 32/40's. At that time Winchester didn't recommend reduced loads of any kind for 296 and in the 80's and 90's, lots of SS shooters used that load or one close to it w/o any problems. And now there is no such warning. BTW, my chrono results with it where 6 fps extreme spread with F150 pistol primers.

Both Unique and B'eye have been used in low density loads in pistols for more than 100 years w/o problems.

If anyone has direct knowlege of a rung barrel resulting from my 10.0 gr load of Unique w/o a wad, please, please, let me and the rest of the forum know about it.

Frank

Thanks to all for the replies I have one question on wad placement. I shoot the same shells in my Peabody so right know all I do is clean re prime and load. No neck sizing or anything. With my Goex load I compress add 60 thousand wad. Then I just thumb seat the bullet. With a smokeless load I have run into a problem with the extra room in the case. If I use a wad seated on the powder my bullet falls right into the case???? What is a good way to eat up the extra room in a case so my bullet fits the shell better or should I not worry about that.   With ringing the chamber if my wad is down on the powder and my bullet slides forward in the shell I will have a gap is that what will cause a chamber to ring????? Thanks TommyAuger

Don't use a wad.  With fixed ammo and smokless re-size the case then expand with a Lyman M die or the equlivent then seat with light but firm neck pull.

If you are worried about ringing probably should not shoot the rifle with smokless powder. Loose powder, Unique or 4759 It's not going to ring but will worry you reading all the cautions.

Boats

A 3/4" cube of dacron filler will take up the empty space and hold the powder against the primer hole. Works for me with SR4759.

tommyauger;

I have a Pedersoli Sharps and I use 24 grains of 2400 with good success, I don't use wads or fillers with it and it isn't position sensitive.
I also use Trail Boss but the velocities are lower then I want for hunting.

Matt