volshooter said:
Thanks Jeff! I happen to have a few cans of 3f. I will post further as member is about to "hook me up" with dies and brass.
I made a plug the same shape and length as the bullet I'm using to compress the powder (made from piece of hickory dowel rod).
I drop the powder through an 18" drop tube (copper pipe with a brass funnel soldered to the top). then place the card wad over the powder and compress with the plug in the bullet seating die. Once I have 50 seated, I then seat the real bullets.
Using the softish lead bullet to compress the powder can mess up the nose.
You can do away with the drop tube but the load would be compressed more since the drop tube settles the black powder in the case.
The blackpowder loads in a 45-70 are crazy accurate.
A lot of guys use 2F. When I had my original Trapdoor, I used a lighter bullet (405gr) and the same volume of 2F (BP is typically loaded by volume). 2F is a slightly slower burn (well explosion since BP goes off differently than smokeless).
On a modern made gun with an action 3F burns a lot cleaner and I found more accurate.
On your Trapdoor, I'd probably try the 2F first. I shot 3F in my trapdoor but it had proven itself strong and in good shape with a lot of rounds through it before I went to the 3F load. I'd suggest safety first.
Be sure the action locks up tight and the gun is safe if it is an original.
60 +/- gr 2F, 405gr bullet (same profile as the 550 but about 1 grease groove shorter) and same loading procedure.
For the first couple shots with an old original trapdoor, I'd figure a way to grip the trigger with a string while the gun is secured just to be sure nothing is going to let go.
I put well over 2,000 rounds through mine before I sold it and had no problems. Even the 1883 Buffington sights are not very precise.
Have fun with the new rifle. Looking forward to pictures and a range report.
Jeff