Ok checked out different reloading site need imput. Darryl or anyone if you push the 300SAUM with a 220gr pill at a bit over 2600fps from a 24" barrel. Then say neck up the case to take a 338 j40 270gr or a SMK 250,300gr from a 27" barrel would the ballistics be the same or close to it ? Also say throw in a 1 in 8 twist. Doc if you happen to read this Ric from T-O said hi.