I have taken 900gr Woodleighs & Kodiaks up to 2250 out of my 20" bbl & 1040gr Beartoothe LBT's to 2k. Those Beartooth's are just plain brutal at these speeds in my Ruger #1 600JDJ. The bolt 600 OK from AHR has such a good stock design I can push it hard before it becomes punishing. All of this is sooooo dependent on you, the shooter. If you are truely able to handle heavies these 600's aren't bad at all & NOTHING kills like they do, bigger or smaller & faster. My bolt 600ok weighs right at 11 lbs and my 600JDJ weighs 10.5 lbs.