I use a comparator at the bench all the time. I haven’t used the shirt cut but I did run imr4831 in my 260 with the 143 eldx. Only powder it would group with. I’d think velocities would be slow as they were with the 260. I’ll take accurate and slower over fast and not.

You will love the rifle. All 5 in ragged hole at 200 with 130 accubond. Hole above is from 7 mag. I just got match bullets to load up.

Don't guess I want a hunter if no one can say good or bad.

The Enduron imr 4451 has been best powder I've found for the wsm.  I use it for 180 and 190 accubond. Sub moa out to 300. Never tried any farther.

I had thought about buying a neck sizer but so far I had never had any issues with full length sizing on a single stage. My 260 and 243 reloaded like clockwork. I actually bought 243 brass and resized it to 260 to start with. I could never really tell the difference in the 243 necked up. Hornady brass off the shelf at Cabellas. I just quit using… Read more