The 300 stealth Evo comes with a metal magazine in two different configurations ( 5 & 10 rounds). Looks like only the short action configurations have polymer mags. I don’t think MDT sells polymer long action mags. The stealth evos have vanished from the states since May 2020, I have been looking for one in 338 Lapua with zero luck.
I dropped my 300 WM 110 stealth in an MDT ACC chassis and the metal mag fits like a glove .Any savage long action mag should technically fit in a long action chassis.
AICS makes 10 rounders for 300 wm. If you reload , try RL22 and H1000 with 225 eldm , I am getting some .2 groups with ease.
hope this helps .
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