We are currently experiencing bipolar weather here in Southern Oregon, and I missed out on a couple of decent shooting opportunities (sometimes work gets in the way). Today was by no means a perfect day for shooting, but it wasn't raining, so I finally got the chance to try out my Zan .177 slugs that just came in.
I received the 10g, 13g, 16g, and 20g. I shot them all, and since the JSBs shoot excellent with my gun, I compared the Zans to the JSB 13.43g as a baseline.
There were swirling winds and I had to pick my best opportunities, so at best, this is a screening test. I was shooting off a Caldwell Fieldpod, and I was making a reasonable attempt considering the conditions; the results show great promise for the .177 Zans in 10g, 13g, and 16g. I am sure the 20g would do better with a greater FPS. I typically do not "tune" my guns. If I get decent groups using the hammer spring adjustment alone, then I live with that and try projectiles that work within those settings. I was at hammer spring 5 for all shots, including the 20g, where I also shot at Max, so there are 2 groups for the 20g.
You will also see a heck of a flier on the 10g. That was shot #1 where a gust of wind came up just as I pulled the trigger, so it's obvious that the gust was active at the target, so I didn't count that one, and there is a hole in hole on that target as well.
I'll post pics once the site has uploads working again.
Zan 10g

Zan 13g[url="https://www.dropbox.com/s/a99yzari7hrf3s9/Z-13.jpg?dl=0"]
Zan 16g[url="https://www.dropbox.com/s/r3vmyzrwb4le4zm/Z-16.jpg?dl=0"]
Zan 20g[url="https://www.dropbox.com/s/1lfp5813h31rkcx/Z-20.jpg?dl=0"]
JSB 13.43[url="https://www.dropbox.com/s/bqloawpq8ogoibm/JSB%2013.43.jpg?dl=0"]
As the pictures show, the JSBs don't look as outstanding as they usually are at 50 yards, but again, it demonstrates what the Zans are capable of on a better day.