22-250 and "magnum" powders

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sundance1972

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duncan b.c.
A friend of mine loaned me his copy of ken waters pet loads(awesome books, by the way. tons of info) Under 22-250, he lists a few loads with 4831, 4350 and mrp powders, using 60 gr + bullets.
Has anyone here tried these loads? I haven't fired anything bigger than 55 gr in my stevens 200 yet, but might have to give it a try.
 
The stevens 200's are 1-12 twist (had to look it up to make sure) so i think it should handle them ok, might not be the best in the velocity or accuracy dept. , but i guess you never know. The book stated that mrp was the best powder tested for 70gr bullets, but unless i missed it, there was no mention of twist rate in the test rifle. Guess i'll have to go back and read it again. A friend of mine said he's got a bunch of 64gr sp's, might have to load some up and try it this week-end.
 
IMR 4007ssc is the slowest I have used in mine. Works well with 55 & 60 gr bullets (1:14 twist). Edit : I've used W760 too which is a bit slower burning yet. Seemed to work ok, but not as well as 4007ssc or Varget
 
Works pretty good!!

Loaded up some 64gr sp's yesterday with 40 gr mrp, got 3 groups around 1/2" at 100 yards!! Don't know what the velocity is (forgot the chronograph), but can't complain about the accuracy. Might be worth doing some more testing out to 200 yards+
 
sundance1972 said:
Loaded up some 64gr sp's yesterday with 40 gr mrp, got 3 groups around 1/2" at 100 yards!! Don't know what the velocity is (forgot the chronograph), but can't complain about the accuracy. Might be worth doing some more testing out to 200 yards+
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I'll give you my old hat, a jackknife and three squirrel tails for a can of that MRP!
 
a friend of mine has been shooting the 60gr Hornady over IMR4350 in his 788 22-250 for as long as I can remember....it nails coyotes hard....but cases don't last long with the rear locking action...but that's another story....
 
http://www.reloadersnest.com/burnrates.asp (no idea how good it is) lists Norma N205 at #228, Norma MRP at #233, and Bofors RP5 at #236. So it sounds like they're cousins, but perhaps not the identically same powder. Then again, it lists Varget (#182) separately from AR2208 (#184), and they *ARE* the same powder.

(so I'm still trying to figure out what to do with all the RP5 that I bought a number of years ago...!)
 
rnbra-shooter said:
Any idea if what Higginsons used to sell as "RP-5" was the same as MRP, or just its neighbour?
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I have no idea what RP-5 is. As has been said, MRP, Magnum Rifle Powder, was Norma's replacement for their 205.
The same loading data was used, as for 205, but the newer version was supposed to be more stable, as to temperature changes.
Sometimes the odd can of Norma powder appears at gun shows.
 
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