I have one. Not a lot of experience though. Had it for 6 months.
With your longer barrel 2217 should be fine. Mine is 20" so needed a few more herbs and get my best velocity/accuracy combo from N565 and R26. I have 1.5 pots of N565 left and then its done. It seems to be best.
From my 20" barrel I got 2850fps with 2217 - so you should get an easy 3K.I get close to 2.9k with N565 and R26.
124 grn hammers are at 3K with N565 and very accurate.
Every powder and projectile I have tried has been great for accuracy (rifle Mauser M18) So far I have only tried 140 AMax, 140 Berger, 140 Gold Dot and 124 Hammers. The Amax kill kill best - that tells me the ELDM will be good. I 'havent shot anything with the hammers
The internet babble says that you don't need magnum primers. I just use ordinary Federal LR - but will try magnum to see what difference it makes to SD and velocity.
All my projectiles have been 20thou off the lands.
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