I've shot nothing but Win209A in mine with blowback only an issue when I fired Swiss behind a 496 grain conical. With sabot loads, I get almost nothing.

If you hold the rifle barrel pointed up when opening the action, the W209A are loose enough to fall out but not for normal action opening. Very easy to remove though.

After 12 rounds of T7 FFg plus 9 rounds with BH209 (sabot loads)