First off, you’ve been told correctly, just hang on to that sucker until you start it in the case mouth and your good to go. When you chamfer you just need to clean up the case mouth not much more. You’ll find that you always need to hold onto flat bases to start em. Secondly, my last 8 twist shot 50-55 grains lights out. I could stack one on top of the other until the barrel got too hot. So you’ll likely be just fine with the range of bullets you’ve got. You may want to look into heavier bullets once you get to 1000 yards lol, but for all else you’ll be good! Try to find some Varget!