Yes,from what I had read in the past MRP,Reloader-22 and Winchester WXR were all made in Sweden at the same factory.Reloader-22 and Winchester WXR were same powder as MRP that did not make the MRP specs.Winchester WXR was discontinued around 2012 and was replaced by Winchester ball powder 780 Supreme.I never shot any MRP,but I did compare Reloader-22,WXR and 780.With the same charge in my 7STW,Reloader-22 was really close to WXR.WXR ave about 15fps faster and that's really nothing.You can have that much difference in the same branded powder of different lots.They grouped the same with my loads.780,now discontinued too,was a bit slower,around 40fps with the same charge weight.I'd say it is probably close to IMR-7828.

~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............