Home Forums Reloading Big Game Rifles Replacement powder for RL22

Alliant 4000-MR seems real close to RL-22 in my 30-06/208 AMax loads.

Hmmm...

I just happen to have a can of 4000-MR...

DF

I picked up a pound of 4K when it was all there was on the shelf. Seems good in my limited testing. 60gr RL22 or 60gr 4K both give 2700 fps with the 208 AMax in a 22" bbl.

The RL22 is lightly compressed though, where the 4K still has enough room to shake.

Seems to be one of those powders with more energy per unit of mass. So, I assume it's double base.

Alliant sure didn't do that much marketing of their Power Pro series, not a lot of info available. So, no surprise with the lack of enthusiasm. I guess no one took 4000-MR and ran with it like with RL-17.

DF

Let me know how it works for you.

I just got an email from Alliant, saying there is no tested load for the 150 NPT in a 7RM using 4000-MR. Well, I'm going to try one this weekend based on data from Speer and others for 160's.

DF

You, sir, are a rockstar! Powder is still scarce around here and one popular gun and reloading shop I just visited claims not to have even received any RL-22 in over a year!

I haven't been able to find it in 18-24 months and it's my most commonly used powder. I'm down to about 1/3lb.

I just ordered 4 pounds (all the hit my pocket book could take right now) and I'm excited to have enough on hand to last a little while.

Thanks!

i used 7828 SSC in place of RL22 and liked it alot

I have an 8# jug of PP-4000, I have yet to use any of it. I bought it to try in my 300 Win.

No, it's not the same powder, in fact, it doesn't even look the same; RL-22 is lighter gray with more irregular & more flattened granules, MRP is darker & is very uniform in particle size & meters much better.

However, I have always been able to use the same charge weights in the same rifles interchangeably, so from that standpoint, they are the same.

MM

I substituted MRP for RL-22 grain for grain and achieved virtually the same results. The powders are visually identical and there were sources I trusted that made the same claim. I consider them the same.

MM, maybe your lot of MRP had a little more graphite on it to give it more blackness? I've seen tint variations with different lots of the same powder fairly often. And granule size can sure vary too. But it should be every reloader's mantra to use caution.....

From what I understand Norma MRP powder is made in Sweden.The lots of MRP that don't make the specs are packaged as Reloader-22 and the discontinued Winchester WXR from that same factory.I personally have never used MRP,but I have used Reloader-22,Winchester WXR and Winchester 780 Supreme(also discontinued).As far as I could tell,I could shoot the same charge weight in my 7mag,7STW,300WSM and 300 Win mag and get nearly equal velocities and still group the same with any of the three powders.7828 will work too.It is just a tad slower and you may have to add about one grain more to get the same velocity.

A batch of RL22 just landed at our local BassProShop.

If you have on near, I'd suggest checking it out.