What twist for a 120grn CB in .257

[PAT303]

I have a 25/303 I want to start casting for and CBE sell two boolits,a 100grn and 125grn and RCBS sell a 120grn but my rifle has a left hand twist 1-12 barrel and I don't know if it's quick enough for the two heavier weights.Does anyone shoot these boolits so I can get some feedback. Thanks Pat

[grouch]

For what it's worth CBE's 25790 shoots VERY well in my .257 roberts 10" twist and may do even better in your 12" twist.
Grouch

[runfiverun]

just speed it up some.
if you have a 12 twist target a slightly higher velocity.
slow twists are a blessing with cast, not a problem.
i'd begin at about 1900 fps and go from there, you should be able to hold good accuracy to about 2100 fps.

[beagle]

My Roberts and a 1-10 twist stabilizes a RCBS 25-120-SP just fine./beagle