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

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Sky King

Member
Apr 29, 2023
477
205
Brookfield CT USA
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
 
Sky King said:
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
Click to expand...
Thats bad brother i hope it works out for you alot of money for that gun i got a customized benjamin akela 600 bucks with a few extra nailing poop at 100 yards with out a regulater they should be ashamed selling that over priced junk i hope you get it all squared away it must be upsetting good luck they should be able to refund you
 
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Go up and down the speed ladder for both pellets and slugs. Just because you don't like shooting at certain speeds doesn't mean your gun doesn't. I just went through this with a MA2 Genesis. I like to shoot JSB 18.13gr pellets between 865-890fps and the gun didn't agree with me. The gun liked to shoot them sub-moa at 920fps. We compromised and the gun now shoots them at 920fps.
 
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caliusoptimus said:
Just curious... what was wrong with them that caused the poor accuracy?
Click to expand...
No Idea. They all had super consistent bores with no tight/loose spots. They also had well machined crowns and were machined by an expert (Martin at Airguns USA). When I posted a similar thread awhile back about issues with multiple .22 RAW barrels, others chimed in and said that LW Poly barrels have been hit or miss quality-wise the past couple years.
 
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Sky King said:
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
Click to expand...
Have you lap in your barrel?
 
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