RL-7 in 45-70 Position Sensitive?

[H110]

I have been thinking about trying some RL-7 in my 45-70 for reduced loads. Somewhere around 33 to 35 grains. How position sensitive is this powder and do you need a filler? If so what type.

What are you loading in the 45-70 say around 1200 FPS and also around 1500 FPS, 300 grain LFP, in a 24 inch Marlin.

[GH1]

According to the staff ballistician at Accurate, 25.3-28.2 gr of their 5744 will push a 350 gr bullet between 1325 and 1475 FPs. I imagine the 300 gr bullets will be similar.
You can also check out www,gmdr.com/lever/lowveldata.htm
This sight has a variety of loads listed for many rifle cartridges using pistol powders for CASS usage.
I plan on trying their loads in a few weeks.
GH1

[Bass Ackward]

Can it be? Sure. So can a lot of other things. But it all depends on bullet weight and how the gun is used.

If I wanted to make lever music and not worry, bullet makes the best filler. Something in the 420 grain range and up works nicely.

[btroj]

For 1200 there are powder way better than re7. Try 2400, around 24 to start. I get 1300 with that load and a 420 gr bullet. I don't shoot any 300 gr cast so I don't know for sure.
For the 1500 fps range you can start using the re7 and I doubt the position sensitivity will ever be an issue. If the bullets hit close together on the target then you know it is not an issue.

[rintinglen]

+1 on the 2400. I use 22.0 grains for a nice soft load with Lyman 457-191s, 24 grains with the excellent RCBS 45-325U (My pick for accuracy at low recoil levels.) For a hotter load closer to your spec, 33.5 grains of RL-7 under the same Lyman boolit gave me just a tad over 1500 fps, while pushing the RCBS boolit at about 1450. Both of these loads gave me some mild leading, the 2400 loads did not. YMMV

[bigted]

dont know about the lite boolits but do know about the 4 and 500 gr boolits as well as the 405gr jacketed and RL-7.

i used to load 34gr with no filler and finally got my chronagragh working and fired some over it. the spread was in the 40's and 50's fps diference

i then tryed cornmeal for filler and enough to touch the bottom of the boolits. i loaded enough cm to just touch or compress juas a small amount. the spread in fps came down bunch's...around the 10 to 15 amount of spread now...and the accuracy...well it came way up as well with open 1-hole 5 shot groups at 100yds.

just my 2-cents worth.

[nfg]

Personally I never liked "squib" loads in a large case and you are talking about roughly a 50% density load which leaves a lot of air space in the case.

I would suggest asking Accurate Armes and Alliant what powder they recommend and at what levels before trying any you find online...I'm way to paranoid to use someone elses data unless I check with a powder maker first.

Accurate Arms and Lymans manual list 5744 and 4759 with 300 gr +/- bullets in the Trapdoor...I suggest looking at the online manuals for some data.

www.gmdr.com is a very good place to check almost ANY reloading data...I use it quite frequently.

Luck