Jsb 18.13 Bc with Bantam?

Blejda · Aug 28, 2021

Hi everyone

I am wondering which Bc are you guys using to get accurate holdovers out to 100y or a little further?

I received new Brocock Bantam Sniper xr 22 cal.18.13 Jsb's are going 840fps.Everyone with similar setup?

Regards Marko

mcoulter · Aug 31, 2021

Hi Marko, have you checked out this page of Hard Air Magazine?

https://hardairmagazine.com/ballistic-coefficients/

Their testing of the JSB 18s was at 843 FPS and came up with a BC of 0.035. The far velocity (30 yards) was 756 FPS. This should be a reasonable starting point.

Hope this helps!

Blejda · Sep 1, 2021

Hi mcoulter.

Yes i have seen this but i decided to use 0.0330.

That is what chairgun gives me for this pellets and it looks to be very near my real life results.Maybe i must lower it just a little because at 100y the pellets were hitting a bit low and at closer distances is spot on.But i am having a little accuracy issues and must first solve this problem because at 100 yards 4,5 inch groups is no good in my book.

Regards Marko

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Jsb 18.13 Bc with Bantam?

Blejda

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