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I've always found Varget to give me a little more velocity than H-4895. H-4350 and RL-17 are powders I might explore for more velocity but a word of note. Usually getting MORE velocity than published from a Shorter Barrel is not all that easy. Sorry for being "Captain Obvious" on that. If you're getting a sub 3/4" group and you only lost 72 fps with a 4" shorter barrel than what was used for the published load you're not doing all that bad. If it were my rifle I'd load a bunch of rounds at 74 gr of the H-4895 using different OAL's and see what happens then. Just keep the lengths so they will feed from the magazine. Changes as little as .005" can make a big difference in some rifles due to the timing of barrel vibrations.
A good start would to see how long a cartridge with your selection of bullet will fit in the chamber. Either using a Hornady OAL gauge or a case that will hold a bullet just tight enough so it won't move on it's own yet can be pushed into the case when it comes in contact with the lands, measure the space you have available. Then measure the magazine length.I appreciate the information. The published velocities were with a 2" shorter barrel, not 4" shorter and the .69" group was at 50 yards.
I will take your advice and work on the OAL. Where would you start if you can measure the OAL?
What advantages does a slower powder offer?