I got same results in my 30-06, very poor accuracy. They scream at over 4,00fps velocity, for some loads, but fly erracticly. I bought 200 sabots from a reloading supplier several years ago & still have 125 left. Much better off with some light 30 caliber bullets designed for varminting. Hornady makes a nice 110gr pill, that shoots well for me. I have too many 22 caliber varmint rifles now, so I kinda quit fooling with the 30 caliber & light bullets. It is a fun project though.
Take care,
HS