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 Post subject: Chairgun and BC
PostPosted: Sat Sep 22, 2018 9:55 am 

Joined: Thu Sep 01, 2005 12:41 pm
Posts: 117
Location: Montreal
Bottom line, anyone calculated their own BC and how to do it?

Here's the story;

Most pellets are around the 17.5 fpe mark. JSB 15.89 @ 710fps, Hobbies topped at 808, beeman FTS 740, etc.
For some reason FTT 5.55 (10 weight 9.5 grams) were at 710 (+- 5) / 16.5 fpe. Doesnt really matter they shoot great. At my last shooting session, took some time to zero at 25 with 5.55. Retested beeman FTS 5.53 and exact 5.52 for accuracy (had only a handful left of each). To me 5.55 were better despite lower MV. One thing that looked odd was that the beeman FTS were at same height on paper as the 5.55, jsb higher. So i took the chrony to 25yards and ran 3 shots through it. avg for 3 was 665.

If I look at chairgun that would make the 5.55 in my HW80 as having a BC of 0.045 or so. Does this sound right to you? I didnt have any others left by that time but got some more ftt 5.54 and 5.53 i plan to test next time.

IMG_20180922_104133464_HDR.jpg [ 432.75 KiB | Viewed 332 times ]

HW 40
MP 61 Scoped PCP conversion
MP 61 (soon to be another convert with peep sight)

HW 45
HW 80
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