Anyone using the kestrel and RWS R100? I am having a heck of a time getting the two to jive..The closest I can get is using a G1 of .152.. if you look around the web and dig a little .130 is said to be the G1 but that doesn’t work at all..I was just wondering if anyone else has had luck and if so what G1 did you use?
Kestrel and RWS 100
- Thread starter Lastsaint21
- Start date
You need to true the Kestrel to your gun and ammo. Having a chronograph in not 100% needed, but it is better to know the true muzzle velocity. Then you need to start with a zero, pick a distance, but I use zero at 50 yards, because that's what I prefer. Then you need to figure out what you need to dial at a longer distance, say 100 yards because it's an easy round number. Once you do that you adjust the Kestrel with true MV, ammo details, pick G1...but you're going to adjust from that to when you change the BC to match what you dialed at the longer distance.
I have trued it.. I have SKLR dialed in.. but RWS even having the velocity put in at 3 different temps, I am having no luck really..I had it dial in tight out to 300..made the normal stops along the way 100, 200 all that.. next time out temp was different and it was off again. I have done this process 3 times and just can’t get it..At certain temps I am over 1160 so I am wandering if going over sub and coming back in and using G1 is messing it up.
Are you using cal-DSF at all? Don't bother doing velocity-temp settings that ends up really screwing things up.
I don't think G1 would have anything to do with it. Going above subsonic and coming back through the sound barrier is going to effect it.
Yes, I had to cal from 200 out.. from poking around a little more.. I guess it’s not uncommon to have to use two profiles..one for 200 and in and then another for farther than that.
It might mess up the math but it doesn’t bother the accuracy at all.. that I have seen so far.
Took a look in AB mobile, the only 2 RWS entries are for R50 @ .163 G1 and Rifle Match @ .166 G1
Given R100 is higher velocity than R50 that kind of steers things to your higher number than the .130 value.
ETA:
All the PDM's are for R50 so nothing to directly look at there either.
Given R100 is higher velocity than R50 that kind of steers things to your higher number than the .130 value.
ETA:
All the PDM's are for R50 so nothing to directly look at there either.
Really ? Are you saying it’s not a good practice to get different velocities from different temperatures ?
I've heard it screwing people a lot more than it helping. Especially if you only put in like two entries and then it starts fluctuating your MV based on what it thinks it might be. A lot of people start having weird issues trying to get their curves to line up and then realize that it's because the temp predictions screwed up all of their mv.
I rather adjust the MV manually based on what I measure/know then to let the kestrel try to predict it.
I rather adjust the MV manually based on what I measure/know then to let the kestrel try to predict it.
I build a temp table for each cartridge I shoot.
In my testing 0.64m/s per C° is very close for all around work. But for cartridges I really want to work well, I take accurate notes.
The key to working dope is shooting many different distances in each session and taking good notes.
I just confirmed dope for my 223 from 100 to 500m and the 300m was 2 clicks up, probably because the snow made some serious mirage. I tested 3 cartridges, all had same issue.
100m, 200m and 500m were spot on.
Doing dope with just kestrel is hard because it is designed to give output. Take a notebook and record every distance with the dialed elevation and then the spotted POI or groups measured distance to POA. Once you have done a single range day with say, 15 shots per target from 50 to 300, you can use that data to solve which BC and MV combination give the same dope (not counting anomalies, luckily bullets are known to travel in an arc after all).
Then from that data you can start working other temperatures. Know that ammo temp needs to reflect ambient temp and sometimes it can take some time for this.
I use this kind of note-keeping:
In my testing 0.64m/s per C° is very close for all around work. But for cartridges I really want to work well, I take accurate notes.
The key to working dope is shooting many different distances in each session and taking good notes.
I just confirmed dope for my 223 from 100 to 500m and the 300m was 2 clicks up, probably because the snow made some serious mirage. I tested 3 cartridges, all had same issue.
100m, 200m and 500m were spot on.
Doing dope with just kestrel is hard because it is designed to give output. Take a notebook and record every distance with the dialed elevation and then the spotted POI or groups measured distance to POA. Once you have done a single range day with say, 15 shots per target from 50 to 300, you can use that data to solve which BC and MV combination give the same dope (not counting anomalies, luckily bullets are known to travel in an arc after all).
Then from that data you can start working other temperatures. Know that ammo temp needs to reflect ambient temp and sometimes it can take some time for this.
I use this kind of note-keeping:
posting pics here is a also a mystery I haven’t yet solved.. when I get to work I will sit down and type it from the computer.
I’m in on this thread, I’m having the same issues out of the r100. Can’t get the dope to log right at all, shooting @1.4 mil at 100 but the kestrel says 2.1. even after i chrono it’s still off.
What is your BC setting? It should be somewhere in the 0.150-0.160 range, with 0.160 being pretty "high". With 1073fps* SK mine is set at 0.157, and it is "dead-on balls accurate**".
*Chrono'd average of 1086fps
**-My Cousin Vinny
It’s .150, I’ve changed it higher and lower and no go. I ran it through a chrono last week and avg was 1154 with a 9fps deviation out of 20 rounds. Regardless of what I plug in, its still shooting high. 1.6 mile high at 210 and .6 high at 100.
I am at .152.. I am getting velocities below
35 degrees 1150
59 degrees 1159
69 degrees 1168
SD's for 50 shots (done it twice) is in the 6.5 range..I have checked all the data with my Magnetto speeds and I cross check my Magneto speed with a lab radar this weekend..the both where in lock step with each other so i know my Magneto numbers are correct.. I am about 1.5-1.6 at a 100.. I also know for a fact I am 2.2 at 117 yards but Kestrel will tell me it's 2.4.. at 68 degrees..
I’ve done the same, but I’m still havi my problems. Kestrel says I’m at 2.1 @ 100 yards b it in fact it’s shooting at 1.4. I’m not sure but it’s frustrating, the groups out of my rimfire trainer and the r100 are great, but I just can’t trust my equipment with it. I switched back to centerX last week in a match due to it.
1.4 is a bit extreme at 100y.. unless you're at like maybe 6000 DA?
At velocities of 1040, I'm at like 2.1.
At velocities of 1100, I'm at 1.6-1.7
For groups out to 200y, .135-.140 has been pretty spot on.
For groups out to 300y+ you're going to need to do a banded BC, since at 300y, the BC is usually around .11-.12
At velocities of 1040, I'm at like 2.1.
At velocities of 1100, I'm at 1.6-1.7
For groups out to 200y, .135-.140 has been pretty spot on.
For groups out to 300y+ you're going to need to do a banded BC, since at 300y, the BC is usually around .11-.12
Is that what the DSF function is doing? Changing the BC at that range? Also what is banded? and if that is not done by DSF how is that done? By making another gun profile? I have heard of that.. 0-200 is one and then 200-400 is another.
It's been a while, but I must have adjusted mine with the DSF function...and it spit out the BC?
I went back out today and went about this a different way. I reset my zero, it was 35 degrees when I set that zero..I had to move it down .2, it was 63 degrees. I then went straight to 200, and it told me to dial 6.6.. I had to drop it 6.4.. The kestrel then said my velocity was 1173.. which is higher than than the 1168 at 68 degrees that my magnetto speed got, and the labradar. I went with what the kestrel said.. It then told me to dial 12.26 at 300.. dead on.. so I went back to 100 and it said 1.6.. again dead on. I guess I will see how it goes tomorrow at the match.
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Oddly enough.. with that new velocity the BC is .130. The stated velocity the RWS shows
That doesn't line up with what I have in mine (0.157 @ 1183fps[SKRM or SKPM 1073fps ammo]), but if it works for your set up, run with it.
This weekend we had a match and they had a 12x18 target at 400 yards..Just shooting off the kestrel as I have never shot 400. with the .130 bc and truing MV at 200.. I hit it 7 times out of 10..made a believer out of me now, as far as the kestrel goes.. My wind reading skills are complete trash, but if I miss it's not the kestrels fault..
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