I have not used R7 but in the 4th edition of Lyman's Cast Bullet handbook they have two lots, neither for lever action 45-70 but I will give them to you.
1. 1873 Springfield 45-70 using Lyman 405gr. Loaded to 2.550" OAL.
Starting load 37grs. gives 1534fps. @ 16400 CUP to 39 grs. gives 1578fps. @17900 CUP.
2. RUGER NO.1 and RUGER NO.3 (ONLY) 45-70 using Lyman 405gr. Loaded to 2.550" OAL.
Starting load 46grs. gives 1785fps. @ 23600 CUP to 51grs. gives 1996fps. @36800 CUP. AGAIN NOT FOR LEVER ACTION 45-70.
There is no listing of R7 in the Lever Actions for 405gr. only for 350gr.
Let us know if you need that too.
Hope this helps.
Futher to above. There was NO LISTING for 425gr. Piledrivers. These were from a 405gr. as stated. This was as close as I could find. It may be used as a guildline but you would have to load slightly LOWER possibly about 10% Lower and work up watching for pressure signs.
I used RE-7 very successfully with the 400 Speer and 405 gr Remington jacketed bullets. Have never seen data for it with the 425 Piledriver, but I'd bet a phone call to Alliant would get you started in the right direction. Good powder and if you've got a good supply of it I understand the desire to use it. I'd call 'em!
Beartooth though - highly recommends that good ol' H322 and I tell you, I was seriously impressed with the accuracy and velocity I saw running H322 and the 425 Piledriver Jr. bullets... Very good combination!
I was just rechecking those loads I posted does anyone here know if Reloader 7 is the same as what Lyman call RX7?
When I was checking burning comparison rates there was no listing for RX7, maybe that is why I automatically went to Lyman"s calling of RX7, any help would be great.
I just want to sure everything is safe and correct.
I do. Winchester cases, Fed 210pr, (43 gr of R7 and the 425 PDJ). I am going to try out some of the PD Lites (350) over Alliant 2400, gonna start at 26 and go up until I get around 1650-1750 w/best accuracy.
I contacted the "Guru of Powder" PapaJohn and he told me that it is all the same powder descriptions in regards to Reloader 7 being called other names such as Rx7, RE7 and RL 7.
So ALL IS GOOD, go ahead with what I put on the site.
I've started with 40 grains of rl7 and got 1530 fps loading in the .457 wildwest magnum brass. The recoil was mild and no pressure signs at all. I've loaded up 5 rounds with 41 grains but the range was full yesterday so I haven't chronographed them yet. I've read that some are getting too much pressure with 40 grains in the .45-70. In the .457 ww it seemed very mild. A 525 grain pile driver at 1530 fps should penetrate anything in front of it I would think.