I have a s/s synthetic stocked T/C Contender carbine with a 22" 45-70 chambered barrel and have been loading for it for about 7 years now.
Here is a few of my top loads :shock:
48grs H322 400gr Speer = 1650fps
43grs Re#7 405gr Rem JFP = 1680fps
55grs H322 300gr Alfa Lafranck Spitzer = 1910fps
54grs H322 300gr Hornady HP = 1850fps (lighter plinking load)
These loads are all top loads in my rifle so before using this data reduce by at least 15% and work up slowly and safely like I did. :shock:
Now a fun load... 8)
I had been reading about quiet/squib low velocity 45-70 loads for years and finally decided too give it a try.
I started with 8.0grs Tite-Group held in place with styrofoam with a 450gr hard cast bullet, which gave me a velocity of 860fps and a fairly loud bang.
I worked down to 2.0grs Tite-Group held in place with styrofoam with the same 450gr cast bullets but this time the bullets were placed into the cases backwards and seated until they looked almost like a wadcutter.
These gave an average velocity of 295fps and the hammer hitting was louder than the shot going off.
This load was shot using factory T/C iron sights resulted in a 1 1/2" group @ 25 yards. This load shoots through a 2X4 @ 20 yards. 8)