Went to the range today with my first try with 160 grain HPs. I sized to .402. Shooting a glock 20 that slugged mostly at .400. I few spots measured. 400.5 and one spot .401. I loaded up 23 rounds to try. I only crimped enough just to remove the flair. To the point some of thr cases wouldn't fall out on their own. So I know I didn't over crimp and size my boolits down. I am using 16:1.pure soft lead and pewter. Bh I'd 7.5 last I checked. My load I tested was 7 grains of unique. The only thing I can think of is im using to soft of an alloy? Never leaded a barrel till this 10mm came along. Wondering how hard of an alloy I should be using so I don't have leading issues? I'm casting HPs so I don't want to go to hard so I have expansion. I loaded up some 180 grain AMEC boolits and had zero leading. They are also sized at .401 ...but measure .402.
Here's after 23 rounds. It cleaned right off with 3 strokes of chore boy wrapped around a brass brush. So not bad but any leading to me isn't good.
My boolits I used. You can see there is no visible crimp point which makes me think I am pushing to soft of an alloy to hard?