Brocock/BRK I cannot get acceptable accuracy from my Brocock/BRK Commander XR Magnum

Thanks for your time and recommendations. See attached images of SD which are almost perfect. Jared suggested that I run the 18.1gn at 1000 instead of 890 or so as I have been. Made no difference. Sometimes the shots are dead-on bullseye and then they shoot left and right, mostly in TIGHT groups. Tried 3 different scopes, so scopes and mounts aren't the problem. I'm sending latest results to Jared at PAD and I'll see what he says.

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1000 is too fast for pellets but, one can never tell, I run most of mine just a bit over 900, I've also found that AEA's run the best, Your pattern looks like one of mine before I cleaned the barrel, of course we have to ask, is the parallax spot on and the scope and mountings proper? If you've already addressed this just ignore me, I thought I read every post but I may have missed it.
 
1000 is too fast for pellets but, one can never tell, I run most of mine just a bit over 900, I've also found that AEA's run the best, Your pattern looks like one of mine before I cleaned the barrel, of course we have to ask, is the parallax spot on and the scope and mountings proper? If you've already addressed this just ignore me, I thought I read every post but I may have missed it.
Thank you for taking the time to respond.

I clean my barrel every 100 to 200 shots with a pull through and Balistol. I usually shoot my pellets between 860 and 888 with 888 being the usual sweet spot for 18.1 and 25.39 in my guns. Today Jared suggested that I run them at 1000 ft./s and I followed his advice and had exactly the same results. I’ve tried two different scopes and I know that my scope and my mounts are perfect.
 
I wonder what others that have the same model PCP as you and are using the exact same pellets are running their fps at Ask .Another thing ,but this is mainly springer stuff; it is better to run fpe below 800fps. Your problem is a head scratcher. I know you are determined,just do not loose any more hair from it,BTW I remember Sky King and Penny .Yes I am that old .:D
(y)
 
I wonder what others that have the same model PCP as you and are using the exact same pellets are running their fps at Ask .Another thing ,but this is mainly springer stuff; it is better to run fpe below 800fps. Your problem is a head scratcher. I know you are determined,just do not loose any more hair from it,(y)
Thanks for stepping in to help. I''ve tried velocities from 500 to 1009 with pellets from 16g to 34g and slugs too. I usually run pellets at 860 to 888 and my Non-Magnum Commander XR is fine, accurate, just like I want it. No issues but it give me 35 fpe and Magnum is 45. Yes, I know, If I can't hit it with the Magnum, the 45 fpe is useless. I am hopefull that Jared will work it out, maybe as simple as new barrel. He said to try it without shroud and I'll do that tomorrow and report here. I haven't ever seen ANY complaints or problems with Brocock/Brk Commander XR Magnum.
 
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I’d stick with JSB (soft lead) and stop cleaning the barrel so often. I’d put a few thousand through it and see if results are better, same, or worse. If the same or better keep going without cleaning. I’ve never had an air rifle that required that cleaning frequency.


I think I read this entire thread but didn’t see what kind of rest you’re using for all your testing?
 
I've been sitting back and reading this over the last few days. Personally, I think you have a barrel issue. Try the cotton test that was mentioned earlier. I find it unusual for a BRK to shoot like that unless it's tuned poorly. I know you're doing your best which leads me to believe there's a barrel issue.
Good luck!
BTW, your gun can actually lose accuracy from cleaning. That residual lead is SOOOO necessary. I clean my barrel after 600 -1000 shots, or when I start to lose accuracy or change ammo.
 
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I’d stick with JSB (soft lead) and stop cleaning the barrel so often. I’d put a few thousand through it and see if results are better, same, or worse. If the same or better keep going without cleaning. I’ve never had an air rifle that required that cleaning frequency.


I think I read this entire thread but didn’t see what kind of rest you’re using for all your testing?
I’ve never had a PCP rifle that I would have to put hundreds or thousands of rounds through in order to get even acceptable groups. Let alone a $2300 PCP rifle.

I don’t like to tinker or “fix“ a brand new gun. I’ve spent two weeks seeking a resolution of this so far. My non-magnum Commander shot fine out of the box, more than fine and the same with my Atomic.

I appreciate your input, and I respectfully disagree on the cleaning issue.

I have (too many) more “high end” PCP‘s that I haven’t had this sort of problem with. They are all extremely accurate, thank goodness.


Thank you again for your input and please stay safe and well.
 
I’ve never had a PCP rifle that I would have to put hundreds or thousands of rounds through in order to get even acceptable groups. Let alone a $2300 PCP rifle.

I don’t like to tinker or “fix“ a brand new gun. I’ve spent two weeks seeking a resolution of this so far. My non-magnum Commander shot fine out of the box, more than fine and the same with my Atomic.

I appreciate your input, and I respectfully disagree on the cleaning issue.

I have (too many) more “high end” PCP‘s that I haven’t had this sort of problem with. They are all extremely accurate, thank goodness.


Thank you again for your input and please stay safe and well.
That’s your prerogative, just a suggestion to do a complete assessment.
 
Ghost seem to have a different quality of barrels (better) than the rest of the Brocock rifles.

I have not read about a Ghost with barrel problems.
a lot of problems with barrels might not be the problem. the scope is not parrael to the barrel. it's approx 3" above and with this difference triangulation is something that needs to be understood. zeroing at longer distances, the barrel becomes almost parralel, so the scope line of sight is more or less 3" at all distances. a close range zeroing will have a significant effect on longer lange unless you re zero your scope for the longer distance. it's just understanding geometry. i have heard people say it's cheap scope or bad barrels, thats' mostly wrong. if the vertical accuracy only is affected then it's a triangulation issue and not a equipment problem.
 
Re my Commander XR Magnum in 5.5mm:

I got it about 2 weeks ago. New. I spent 2 weeks testing virtually every pellet and slug in various head sizes and weights from 18.1gn to 33.956gn. I am obsessed with accuracy and shoot for an hour or three in my backyard at 50m. I demand very low single digit standard deviations in velocity. I am experienced in tuning.

I've managed to get my SDs where I want them but at 30m the all I get is 3/4" or 1" groups no matter what pellet or slug I use. I run my pellets at 888 fps or so and slugs at 1009 or so.

I've checked for loose screws and bolts, The barrel and shroud is tiht as it should be.

I've tested it with moderators on and off. (no difference)

This type of group is regardless of what ammo I am using and I've varied the speeds to see if that made a difference. It hasn't.

I've changed scopes, optical and digital to see if it was a mounting or scope issue. It isn't.

I clean my barrel every 100 to 200 pellets.

So far I've shot well over 1000 pellets/slugs with the Brocock/BRK Commander XR Magnum.

I am not shooting in moderate or strong wind.

I am looking for suggestions as to why can't I get the tight MOA groups that I usually get with my other PCPs

PS: I also have a Commander XR (not Magnum) in 5.5mm and I get MOA accuracy from it at 50m.

TIA.
#Brocock #CommanderXRMagnum #Accuracy #NotAccurate
a lot of problems with barrels might not be the problem. the scope is not parrael to the barrel. it's approx 3" above and with this difference triangulation is something that needs to be understood. zeroing at longer distances, the barrel becomes almost parralel, so the scope line of sight is more or less 3" at all distances. a close range zeroing will have a significant effect on longer lange unless you re zero your scope for the longer distance. it's just understanding geometry. i have heard people say it's cheap scope or bad barrels, thats' mostly wrong. if the vertical accuracy only is affected then it's a triangulation issue and not a equipment problem.
 
I shot my (non-Magnum) Brocock/Brk Commander XR in 5.5mm today with same JTS 25.39 pellet to compare and see if I got the accuracy I expect from IT and the Magnum.

I wasn't even trying to be the MOST accurate <<I>> could be and here what I got from same bench at same 30m.

5 shot group.

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