Jumping in to keep this thread alive. I just rebarreled my M70 Stainless 270 WSM with a 24" 1:8 twist #3 contour barrel and hope to shoot it this week. I spec'ed it to be throated for the 165 ABLR to kiss the lands at 3.0" since my magazine will feed about 3.025" max, but I just checked it and it ended up a little long. The 165 ABLR hits the lands at 3.06" - same for the 150 ABLR and the 145 ELD-X. Given the way these tend to like a little jump that might end up being just perfect.
Very interested in the loads others are using in their 8" twist, long-throated 270 WSMs. I know one thing, it's going to smoke that Johnny-Come-Lately 6.8 Western!
Hodgden has published a great deal of data for 6.8 Western and I figure I can use their max loads as starting loads for this .270 WSM.
Do the rest of you concur?
Cheers,
Rex