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QUESTION ABOUT R9 TRAJECTORY
Posted: Sun Sep 02, 2007 9:20 pm
by HAIR BEAR
G'day all
how are you all going ?
well i finally did a little sighting work on sunday arvo !! and found this as a result (R9 .20cal, with Maccari kit , shooting jbs EXACTS )
at 10 yards POI is 15mm low
15 yards POI is 15mm high
20 yards POI is 0
25 yards POI is 15mm low
30 yards POI is 35mm low
question is, does these figures seem right ???
have been mucking around with a optimun point blank calculator , and the figures are out by miles , according to said program i should only have about 15mm differance to about 30 yards , but in reality at 30yards i got 50mm differance ???
THANKS FOR ANY HELP
Posted: Mon Sep 03, 2007 2:23 pm
by astro
no idea....sorry
Posted: Mon Sep 03, 2007 6:08 pm
by daisy
Looking at ChairGun2 would help ,but you need to know scope height, MV and the BC of the pellet.
The program ChairGun2 can be downloaded from this site
http://www.chairgun.com/
HTH some
daisy
Posted: Mon Sep 03, 2007 6:21 pm
by HAIR BEAR
G'day daisy
here some info for you and see what you get
scope height is 1.500
MV is 729 f/s
BC of jsb (EXACT) .20cal is 0.0273
weight of pellet is 13.73 grn
energy at muzzle is 16.2 fpe
was using the site link that yrrah put on think it was airgunexpo !
thanks mate
Posted: Mon Sep 03, 2007 6:50 pm
by ant
HB
Results are quite close to mine. I have zeroed my R9 in at 25m using the JSBs.
Still grinning
Ant
Posted: Tue Sep 04, 2007 8:42 am
by makrand
That's pretty similar to what I'm getting with the 97 HB.
FTS would be flatter.
Re: QUESTION ABOUT R9 TRAJECTORY
Posted: Tue Sep 04, 2007 3:30 pm
by plantboy
HAIR BEAR wrote:G'day all
20 yards POI is 0
HB, why such a short range zero? I Suggest you try a 25 or 30m zero and then do the trajectory experimentation.
Posted: Tue Sep 04, 2007 7:53 pm
by HAIR BEAR
G'day plantboy
yeah was thinking of taking it out to 25 yards ,but most of my shooting is at around the 20 yard mark , hence the 20 yard zero !
Also at 25/30 yard zero , thinking the hold under would be a bit much ?
but will try it out maybe thursday arvo ?
will also try the Beeman FTS !
Posted: Tue Sep 04, 2007 8:45 pm
by daisy
FTSs red & JSBs blue
Graft in yards & inches
HTH
daisy
Posted: Tue Sep 04, 2007 8:58 pm
by HAIR BEAR
G'day daisy
mate if my R9 shot like , be over the moon ,thats a half inch change from 10 yards to 30 yards !!
but i got around one an a half inch in that zone (10 to 30 yards)
think i need to get my self a chrongraph ??
THANK YOU daisy
Posted: Tue Sep 04, 2007 9:16 pm
by daisy
I'll have to do some tests with my R9, it's 177.
I have had the odd beer tonight (must be one of those days of the week with a y in them.)
Posted: Wed Sep 05, 2007 5:23 pm
by ant
HB,
Don't worry just enjoy your rifle! R9s are fun. Remember though, if you buy a chrony, there are 2 types of people.
1 those who have shot their chrony and
2 those who are about to.
Ant
Posted: Thu Sep 06, 2007 6:46 am
by makrand
perhaps I'd better stop balancing mine on the balcony rail to shoot through.
