I just finished doing the exact same thing this past year. A pre 64 action with a Kreiger barrel with an 8 twist chambered in 6.5x55. No bolt modifications and feeding is just fine. Ended up with bullet seated .0008 off a soft jam as what it liked. Using Lapua brass, I picked a load using H4350 and 130 gr Nosler Accubonds that chrono'd at 2950. Shot many groups just under 1/2" @ 100. Good enuf for me.
Phil
