Shooters Forum banner

Steel powder for a 450 bushmaster.

738 Views 13 Replies 9 Participants Last post by  daleisfishing
silly me I did not bookmark the information. Steel powder for a 450 bushmaster.

I read someplace that there was some info on loading Alliant steel powder with a 300 gr lead bullet in a 45 bushmaster. Has anyone seen something or know something about this?
It is supposed to be like what it does for shotguns, more speed less felt recoil.
Ever hear this?
1 - 14 of 14 Posts
Alliant doesn't list it for anything other that steel shotshell loads so I'm guessing you saw someone's loads who is experimenting with the combination on their own.
There's an element of danger in that especially since using a shotshell powder for centerfire loads without any data whatsoever means flying blind.
Don't get me wrong I've used plenty of shotshell powders in rifles in small quantities but with powders that have been around a long time with some history of that application.
  • Like
  • Helpful
Reactions: 2
Daleisfishing - please use a smaller font (lke Kevinbear's) for posting on this board.

Thank you.
  • Like
Reactions: 1
Alliant doesn't list it for anything other that steel shotshell loads
Although the burn rate for Alliant Steel is available from a couple sources, that's not enough information to approximate a load for the Bushmaster, or anything else. Powders for reloading steel shot seem to sit by themselves. Not a good sign.

Powders aren't that scarce these days. Prices are on the high side, but they are lower than a trip to the hospital.
I have many other powders that can and do work.
The availability of powders up here in the powder Desert is poor at best.
I'm always looking for more and better.
I'm betting reloader 26 would be outstanding too.
I just thought someone may have seen the same info.
By the way, I use a larger font to see what I have written.
While "burn rates" in powders usually doesn't mean much (H4350 and IMR4350) the gap between "Steel" and "RL26" is quite a large "canyon".

RL26 may be "slow" enough as to cause a squib as it's considered a "magnum" or "over bored" cartridge powder as in say the .243 with heavier bullets or the 338 Lapua.

You've picked a good forum to join as none of us will steer you in the wrong direction.

By the way, I use a larger font to see what I have written.
Control + will zoom your screen in, without changing the font size; which is akin to screaming on the Internet.

Also, I've moved your post for you. Please don't just dump things in the General forum, there's even a sticky immediately above where your post was; telling you to not do so.

  • Like
Reactions: 1
Reloader 26 is way too slow for a cartridge with an expansion rate as fast as the 450 Bushmaster has. You can expect the powder may actually extinguish during firing and leave a bullet stuck in the barrel.

As far as Steel goes, you could call Alliant to see what they say. Based on the relative burn rate being in the vicinity of Accurate N0. 9 and 4100, if I had to use it, I would develop the load using my Pressure Trace. I would run a few commercial loads with it and use their numbers as upper limits. I would start way low, like 20 grains for a 300-grain bullet, and work up slowly while watching for signs of pressure excursions or other irregularities. As long as there were none, I would head toward about 80% of the commercial load peak pressure and stop and then shoot it for a while just to be sure nothing strange came up before continuing to work the charge up further. The caution may seem excessive, but every once in a while, we get funny warnings, like the one from Alliant about not using Blue Dot in certain applications it used to be popular for. So you have to watch out for the unexpected oddity when exploring uncharted territory.
See less See more
  • Like
Reactions: 2
Thanks, I may look into it.
Alliant Steel is not recommended for anything other than shotgun shells. It's no consistent in any rifle or pistol cartridge. I researched this when it was the only powder on the shelf at the gun store and I found out why.
Little Gun is THE powder for the Bushmaster. 4198 is your second choice.
If you like Alliant powders I would suggest you look at the reloading data for RL-7 in the 450 Bushmaster case. If it works so well in the 45-70 it sould have the same good characteristics for the 450 bushmaster.
Actually, I'm a fan of any powders, whatever works best in what I'm working on. I was just asking if anyone saw it not that I was intent on using it.
Thanks for the input guys.
1 - 14 of 14 Posts