I tried a bit more powder and the 6.5 still shot lousy. I tried jacketed and it shot great. Maybe it just doesn't like this bullet. I'll try some of Norm Purcella's before I give up on cast in this rifle.
The challenge with 6.5 swede is most cast bullets are to small.
Cast bullets with out getting to involved with alloys and special twists rates have a RPM threshold some where in the 120-140,000 rpm range with a fast twist like the 6.5 swede thats about 1200-1500 fps
Then theres bullet size - the 6.5 swede M96 is a pretty generous chamber and bore vs the say the “new” 6.5 swede chambers and bores if the M58s or what ever the swedes call their target rifle based on 6.5x55
Your going to need a cast bullet thats .266-.268” or even bigger
Old time caster told me old surplus you need a cast bullet large enough but still have room in the neck area so it can chamber. Some times you just need to do a chamber casting , measure the neck and freebore and size as needed.
I put cast loads on the back burner with my swede. The jump to the lands is “endless”
The cast bullet bounces around the lead like a plinko chip!
Jacketed bullets will handle that better imho. My swede with 140 fmj shoots as well as I and my eyes and those sights can handle.
My next step in the swede for cast is going to a gallery load of about 850-1000 fps with trailboss. If I cant get fun plinking -3 moa with that im done with cast in the swede.
Im not feeling the love for the swede as it is and might sell it anyway.
FMJ loads are easily sub 3moa , most likely better but I struggle with the sights