My jkhan bullpup .25 arrived today!

[Luis Lasso]

Going to have to get a riser though, ordered mid height rings. Silly me...

I also find that the scope sits very low on top of the receiver leaving my head/neck in an uncomfortable position to sight through the scope, had to install a 20mm riser block and high mounts.
I have a proper cheek weld with this set up, though I am afraid there is too much clearance between the scope and barrel. ,  Not the most ergonomic rifle plattform IMO.

[Bwalton]

Baxter, last night I watched your review of this gun on Youtube while you were out somewhere at a cow farm for pest control. the gun looks ergo. must be very comfy to handle and shoot!

Its not bad at all...

[Nomadic Pirate]

Going to have to get a riser though, ordered mid height rings. Silly me...

I also find that the scope sits very low on top of the receiver leaving my head/neck in an uncomfortable position to sight through the scope, had to install a 20mm riser block and high mounts.
I have a proper cheek weld with this set up, though I am afraid there is too much clearance between the scope and barrel. ,  Not the most ergonomic rifle plattform IMO.

That's the big shortfall of BullPups, you can only get your face so low since you are on the receiver, that's the one thing I didn't like about Pups.

 

[Tims229]

The  cocking lever isn't in the best spot either. A little more time behind it and I'm sure I'll figure out a way that works.

[Djbriez]

The  cocking lever isn't in the best spot either. A little more time behind it and I'm sure I'll figure out a way that works.

I find that to be true on every BP that I own..... None are optimal, you just get used to it.

DJ

[nappyman]

If your going to use for hunting, get a bigger plume and raise the reg up some. Or drop down to 25.4g cause those numbers are really LOW🙀  But if it's more than enough speed for your needs then I stand corrected. Decent gun though, I have some trigger time with one, it shot well. Enjoy

[TleVta]

What is a "plume", Mr. Nap?

[nappyman]

If I spelled it right🤓 Anyway it's the chamber or space between the regulator and the mouth of the  valve entry way. For instance my RSII .25 has a huma in it. The plume 🤓 That came with it is for 177-.25 I didn't like the numbers so I had them send me a plume🤓 Designed for the .30cal now I have it turned down 25.4 @ 906fps for 16 shots and that's with the hammer tension almost all the way out. 3/4 turn in its at 930fps . The reg is set at 152bar.  These regulaters go to 165bar. When I decide to shoot 34g jsb I can turn reg up and with the extra size plume🤓  Reach 880-900fps. Maxed out with the regular plume I could only get 800fps with 34g. Hope this explained what your were asking  neighbor 😀

[Tims229]

If your going to use for hunting, get a bigger plume and raise the reg up some. Or drop down to 25.4g cause those numbers are really LOW🙀  But if it's more than enough speed for your needs then I stand corrected. Decent gun though, I have some trigger time with one, it shot well. Enjoy

Eventually it will be used for hunting. Mostly what I was looking for was how consistent of a shot string I could get as this is my first regulated rifle. Speeds are a little slow I agree, the regulator was set at 150 bar and installed when I got the rifle. I'll most likely bump it up at some point. Right now I'm just getting used to how it shoots and such. I saw a YouTube video showing a larger plume being installed with a Huma regulator, so I know what you referring to. Basically it allows a larger amount of area for the regulated air pressure beyond the regulator. This way, more air is available to be released at the regulated pressure on each shot.

[Tims229]

Well I decided to adjust my Huma regulator up a bit to see what kind of numbers I would get.  Randy at rlairguns suggested that I make a small adjustment, so that's what I did.  I might have needed to go a bit more, but time will tell.  I took the rifle out to run a chrono test, here are the results:

Created   Description   Notes1   Notes2   Distance   Coeff   Weight   Temp   BP
2/9/2016 10:34   noblesse adjusted         6   1   33.95   9 °F   30.23 inHG
#   FPS   FT-LBS   PF               
1   775   45.29   26.31               
2   771   44.82   26.18               
3   772   44.94   26.21               
4   771   44.82   26.18               
5   771   44.82   26.18               
6   767   44.36   26.04               
7   768   44.47   26.07               
8   770   44.7   26.14               
9   766   44.24   26.01               
10   769   44.59   26.11               
11   770   44.7   26.14               
12   766   44.24   26.01               
AVG   StdDev   Min   Max   Spread   TrueMV         
765.56   2.64   766   775   9   766.08         


Now, it was 9°F out when I did this test.  -9°F windchill so it was tough to wait between shots to let the regulator equalize.  I am not sure the effect of these temps on the performance of PCPs, but I was hoping for a bit more rise in fps and fpe.  If anyone knows if there is an effect let me know, otherwise I need to pull the regulator out again and bump it up a bit more.  I was hoping to get in the 800 fps range with consistent string. 
I did shoot six more pellets in this string, but I was obviously off the regulator at that point as the fps were dropping off.

[TleVta]

Hope this explained what your were asking  neighbor 😀

Yes, thank you. And it's also referred to as the plenium, correct?

[tinsoldier]

How it the loudness report comparing to the SS condor?  Does it come with factory removable shroud or that an option? Also, when you bought from RLairgun, did they install the regulator and give you the chrono reports? I am just about to pull the trigger on one but want to make sure it is backyard friendly for the .25

[Tims229]

A bit louder than my condor. Did not come with the shroud, they are out of stock at the time. If you select regulated then it will come installed with a chrono test and 5 shot group. Hope this answers your questions.

[badgerfarm]

Yes, TLeVta plenum is the word that you are looking for.  The right plenum volume is critical for proper regulator function.

[Tims229]

I got the pup out to run a string in a little warmer weather....31°F.  I decided to run 40 shots through it which is 4 fully loaded mags, just to see where it would end up with that many shots knowing I would be off of the regulator at some point.  Ended up getting about 23 shots before going off the regulator, but even off the regulator the velocity stayed up pretty decent the remainder of the shots.  I was at the 20 yard range while doing this string and the shots did not drop at all during this string, which makes me feel good going hunting without any extra air with me because I rarely shoot much over a dozen times while hunting.


Created   Description   Notes1   Notes2   Distance   Coeff   Weight   Temp
2/17/2016 0:00   noblesse         4   1   33.95   31°F
#   FPS   FT-LBS               
1   775   45.29               
2   771   44.82               
3   768   44.47               
4   767   44.36               
5   767   44.36               
6   768   44.47               
7   766   44.24               
8   770   44.7               
9   768   44.47               
10   771   44.82               
11   764   44.01               
12   764   44.01               
13   770   44.7               
14   775   45.29               
15   767   44.36               
16   762   43.78               
17   771   44.82               
18   768   44.47               
19   767   44.36               
20   763   43.89               
21   766   44.24               
22   770   44.7               
23   766   44.24               
24   760   43.55               
25   759   43.43               
26   761   43.66               
27   756   43.09               
28   751   42.52               
29   743   41.62               
30   740   41.29               
31   731   40.29               
32   733   40.51               
33   727   39.85               
34   718   38.87               
35   708   37.79               
36   706   37.58               
37   707   37.69               
38   699   36.84               
39   690   35.9               
40   692   36.11               
Min   Max   Spread   AVG   Av FPE         
690   775   85   751.125   42.5865