About 3 years ago I had Bob White build me a 270 Win , with a super long throat so the 150 Grn. ABLR is only in the neck of the case. The Coal and OGIVE are very long, and I only shot it once. 29-inch very heavy Hart Barrel, with an 8 twist. On a 98 Mauser action. I have 170 Bergers waiting to be loaded, but could not find any data. I'm guessing H 4831SC might be a possible choice, since it works very well with the 150 Grn Bullets. I never knew this modification of the .270 Win actually had a name!!!! Very Nice!!!Any suggestions for loads??? BOOTS , any thoughts ??