I purchased some Alliant 2000 MR because it was available and the more common medium burn rate powders (ARCOMP, Varget, RL 15) were not. It is a very fined grain near spherical shaped powder. Alliant originally marketed the powder as slightly slower than RL15. The powder is made in Florida at St. Marks.

I am impressed with 2000 MR in my .308 Savage Model 10 bolt gun with 20" barrel. A max load for a 168 match bullet turned out to be the most accurate load (0.44" center to center @ 100 yds) I've tried to date. Most surprising this load gave ~150 fps more velocity than I've seen from any other powder I've tried. In testing at 65 degrees, I did not detect any temperature sensitivity as the barrel heated up through multiple charge weight tests.

To date, I have not been as impressed with the powder in a difficult to load for Stag 3G in .223. It seems a bit too slow burning. It did provide for consistent loads on my progressive press though.

Recently shot a spread of 2000 MR in my 9.3x62 (23" barrel) using PRVI brass and 285 grain bullets loaded at 3.208 OAL and a very light crimp. I started at 60.5 and worked up to 62.5 in half grain increments. 60.5 gave 2394 fps and 62.5 yielded 2465 fps. Note: 62.5 is one tenth over the Hornady recommended charge weight for this powder with their 286 grain bullet.

The 62.5 grain load was warm but, there were no primer of brass signs of excessive pressure in my rifle. It also gave the best group of about 1.3 inches. Given this gun shoots 0.5 moa with tuned loads, I think I might be able to vary seating depth and find a sweet spot with this charge.

In February, 2014 I varied seating depth in 5/1000 increments for the 62.5 grain charge with the 285 PRVI. At 20/1000 off the lands it shot a 0.5" center to center group @100 yds. The load has yielded 0.5" every range session since!

In my rifle, with the PRVI 285 bullet, 2000 MR provided higher velocity(by 120 fps) than either RL 15 and 17.

Updated the title and post for 9.3x62 results.

Lots of data here:

http://www.alliantpowder.com/r...der.aspx?powderid=31

does not cover the specific cartridges you ask about but in the 308 with 175s it is very close to Varget.

Found a load for the 69 SMK in the Stag upper with 2000 MR. It was Alliant's max load for the 69 SMK, 26.6 grains loaded to 2.26 OAL. The rifle shoots 0.34" center to center @100yds with it.

Also, found a 0.78" (c-c @100yds) load for the same upper using a 77 grain Nosler bullet loaded to 2.26 OAL. It was 3/10's over Alliant's published 25.2 grain max for the 77 SMK. It seemed safe in this upper (which has a long chamber) but, it may not be in yours.

The nice thing about this powder is it flows through the measure so well it is easy to load on a progressive press.

Recent tests with 2000 MR in my 9.3x62 with the 250 Accubond. Found an accurate load at 63.5 grains loaded at 3.366 OAL for about 25/1000's jump. Bullet was lightly crimped.

Finding the correct bullet jump made a significant difference in 100 yd groups. The load provides an MV of 2609 fps at 85 degrees and near sea level. It shoots less than 3/4" consistently. I'm having a scope elevation knob built for hunting with this combo.

I am not aware of any published data for this bullet and powder. Bolt lift and appearance of brass and primer suggested safe pressure levels in my rifle. I can't say about yours.