Norma MRP

It is available, note that Norma MRP is identical to Reloader 22, was more common in the 80's and became very popular at that time albeit expensive, was considered the optimum powder for large magnum cartridges.
 
I use this powder and find it one of the best slow burners on the market. Right now you can't find it anywhere. In my experience of having used it in several cartridges I found it to be appx 2 grs slower than RL-22 in the same cartridge using the same components. Best powder I have ever used in my 7mm Weatherby mag in terms of velocity and accuracy. JMO
 
Gerald said:
Do any of you fellows use this powder and is it still available?
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I have been using Norma MRP since it appeared to replace old Norma 205

bibatoad said:
It is available, note that Norma MRP is identical to Reloader 22, was more common in the 80's and became very popular at that time albeit expensive, was considered the optimum powder for large magnum cartridges.
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It is NOT identical to Reloder 22. about 2 grains different in most chamberings, as hh mentioned above. I have found MRP to be relatively temp stable, RL22 is not. Dave.
 
Some have stated that RL22 is MRP that never made the grade. I've found that it varies from lot to lot.

MRP was the #### back in the day when people would nod wisely and say it was pretty hard to match Weatherby factory ammo for velocity; (and every gun-scribbler was thrilled to say the same) but with todays choices it's not hard to do.
 
I agree with hunters home and Eagleye in that Norma MRP is not identical to Alliant Re22. When I enter both into QuickLoad, MRP shows about 1 grain slower than Re22 for my .270 Win. with 130-grain bullets. So, the evidence seems to suggest that MRP is a little slower than Re22. I've used MRP over the years in several .270s and 7 Rem. Mags, and have found it to be about the best powder in both. Fortunately, I still have a couple of containers. It seems to be pretty scarce these days. Like many reloading items right now, if you can find some, buy it; it's a great powder.
 
I have two tins (pounds) of Norma MRP, still unused and sealed however, never came around to using it. If or when I start reloading for my 7mm Rem. Mag. I'll try to remember to use it. I'll compare it to the RL#22, which I have about 4 pounds to use-up.
 
Around 30 years ago I was on a US reloading site, Accurate reloading maybe? There was a long debate about MRP vs Reloader 22, one guy that claimed to work at the factory had all the specs and said is was the same they just changed the package. I know Christopher Columbus said never trust what you read on the internet, but 2 grains difference could be a lot to lot varent in volume or FPS in a 70ish grain load. Powders are a little different on many burn rate charts depending on when and who published them.
 
MRP said:
Around 30 years ago I was on a US reloading site, Accurate reloading maybe? There was a long debate about MRP vs Reloader 22, one guy that claimed to work at the factory had all the specs and said is was the same they just changed the package. I know Christopher Columbus said never trust what you read on the internet, but 2 grains difference could be a lot to lot varent in volume or FPS in a 70ish grain load. Powders are a little different on many burn rate charts depending on when and who published them.
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I recall that thread. It was interesting. Lot of good stuff on AR. - dan
 
MRP said:
Around 30 years ago I was on a US reloading site, Accurate reloading maybe? There was a long debate about MRP vs Reloader 22, one guy that claimed to work at the factory had all the specs and said is was the same they just changed the package. I know Christopher Columbus said never trust what you read on the internet, but 2 grains difference could be a lot to lot varent in volume or FPS in a 70ish grain load. Powders are a little different on many burn rate charts depending on when and who published them.
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What I found when using MRP and RL-22 side by side is they reminded me of the difference between IMR 4831 and H-4831. Another difference that I noticed was I found MRP to be much less temp sensative that RL-22 and more constant lot to lot. Close but not the same. JME
 
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MRP said:
Around 30 years ago I was on a US reloading site, Accurate reloading maybe? There was a long debate about MRP vs Reloader 22, one guy that claimed to work at the factory had all the specs and said is was the same they just changed the package. I know Christopher Columbus said never trust what you read on the internet, but 2 grains difference could be a lot to lot varent in volume or FPS in a 70ish grain load. Powders are a little different on many burn rate charts depending on when and who published them.
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Yes, good points, MRP, particularly concerning burn-rate charts. I've seen four such charts, and on all of them, the two powders are listed right next to each other, but with MRP shown on the faster side of Re22. It seems to be the same phenomenon as the burn-rate chart placement of Alliant Re25 and Re26, where Re26 is shown as slower than Re25, but with all the load data (including QuickLoad) showing Re 26 as faster. I guess the results via QuickLoad have convinced me that there is an actual difference,albeit small, between the two. I'm not sure just how QuickLoad gets its burn-rate data, but I suspect that it's not from burn-rate charts.
 
I probably have enough MRP to keep me loading it until I am underneath the Sod, lol
It is one of my all time favorite powders for multiple chamberings.

6mm Remington, 6.5x55, 264 Win Mag, 7x57, 270, 280, 7mm Rem Mag, 30-06, 300 WSM,
300 Win Mag, 308 Norma Mag, 300 Weatherby Mag, 325 WSM, 8mm Rem Mag, 338 Win Mag
and probably some others I have forgotten. Dave.
 
Eagleye said:
I have been using Norma MRP since it appeared to replace old Norma 205



It is NOT identical to Reloder 22. about 2 grains different in most chamberings, as hh mentioned above. I have found MRP to be relatively temp stable, RL22 is not. Dave.
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What do you and HH mean by 2 grains slower?
 
South Pender said:
It means that it takes 2 more grains (of the slower powder) to reach the same pressure as the faster powder, with the same bullet, brass, and primer.
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After my post I researched Norma load data. Noted that Norma MRP will take 1.4 grains more than Reloder #22 for my 257 Weatherby, for the 100 grain bullet.
 
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