i got a new g27 few months ago for sub class gun. shot indoor match with winchester bulk pack ammo and had problem with bullets tumbling, also same problem but to a lesser degree with my g23c. shot a indoor match last week with some old reloaded ammo i had, lead bullets (yeah i know) without any problems, posted one of my better scores with a sub class gun. shot indoor match today with 180gr jacketed reloads and same tumbling problem, however i did shot my highest score ever with a sub class gun. shot the same ammo in my g24 and g23 with no problems. any one have a problem with this? i'm sure it's ammo dependent problem but it seems to only manifest it's self in the short barrel g27.