I have an OG arc 10 rnd mag that has worked great for 6.5creed, and 6dasher in my mausingfield. Maybe the mag just does better for controlled round feed actions? My buddy uses his mags for dasher and 6.5x47 in his mausingfield also, he has a much older model. I'll likely be getting a nucleus once he catches up on all these damn back orders so here's hoping they do well for that action also.