RL-10!

[linwin3000]

  Tim, this is kind of directed your way. Alliant powder recently came out with RL-10 in their series of numbered powders. 10 is about 13% slower than 7 and in the burn rate scheme of things it is pretty much the same as WW748. The extra 10" of tube that we BC bloaks pack around has been the subject of much debate as far as any extra velocity gained is concerned. I read somewhere in this forum that you, Tim, is or was on the hunt for a slower powder than 4198 to take advantage of the extra tube on Bc`s. It might just be 10 as the 13 % slower burn efficiency would be well used in the longer tube. 10 is probably a high energy powder much like 7 and should do well in longer tubes, below you will find some data from Alliant, actually they got it from Speer and will give one a base to start from.
  300 gr. Speer-start 48 gr-1946 fps. max 52 gr-2065 fps

  400 gr Speer-start 40 gr. 1554 fps. max 44 gr. 1720 fps

  Speer apparently worked up these somewhat conservative loads and they are playing it safe, They probably are mid level 2 loads, there were no pressure figures given. What really got my attention concerning this powder is a post somewhere I read that was from a guy shooting a BC and using this powder, his result is as below.

  300 gr Sierra jacketed-47.6 gr RL-10 2094 fps 32" BC tube.
  Of interest here is the extra 148 fps velocity from the longer tube burning off essentially a starting load of 48 grs. Over at realguns.com there is a very complete 5 part lowdown article on the 45-70 called" The Model 1895G & Handloads For The 45-70". The fifth installment goes over in detail all the loads, one might notice that RL-10 gives an impressive performance, again, no pressures but for sure these are smash you in the face loads!
  Ok I know about the vagaries of handloading and how one gun shoots completely differant than every other gun in the world but it would be interesting to do a report on this powder in a BC, who knows, there might be a gold mine there!
  Thanks, see ya
                                                                      Richard

[quickdtoo]

Very interesting, I've been considering giving RL10 a shot, I got some nice 150-200fps increases with H322 and IMR4198 in the BC over the Handi  shooting 350gr bullets, I'll have to see how the RL10 does. A  few more slower powders that could be used are H335, H4895, Varget, and IMR4064, all shown in Hodgdon data for the 45-70.

Thanks,

Tim

http://www.gboreloaded.com/forums//index.php/topic,102319.msg1098277453.html

http://home.hiwaay.net/~stargate/powder/powder.htm

[bearbeater]

Tim
I used 4895 and had alot of unburned powder in the barrel. in the handi and BC.
bearbeater

[quickdtoo]

Well, to be honest with you, I could care less about what the bore looks like, if the load is accurate and has good velocity, who cares what the bore looks like after the shot unless it causes velocity issues on following shots. A great example is 5744, it shoots extremely well in my 45-120 BC, but leaves a dirty bore, but it doesn't affect following shots, it will shoot good all day long, it's always just one shot dirty. I've tried H4895 in the 45-120, it shot great, over 1800 fps with the 525gr Piledriver, but I had to make sure the powder was all the way to the back of the case before shooting it, or it would hangfire due to position sensitivity, a filler would solve the issue. That wouldn't be an issue in the 45-70 with a case full of powder!!

Tim

[bearbeater]

Hey Quick
It is accurate and I like it give good groups in the BC just unburned powder in the bore. Not a lot just enough to say look at that. I have alot of 4895 and 4227 thats why I use it I have alot of rl22 also.
bearbeater

[Graybeard]

Regardless of your powder selection it should be pretty much all burned up in the first ten inches of barrel as has been shown in a great many lab tests. That does NOT mean that more barrel can't equal more velocity or that some powders do better in longer barrels where as others might not add as much. But it's NOT because it takes that much barrel to burn it only that the pressures from the burning of some stay higher longer or peak later than others.