Brocock/BRK Atomic .177 with Air Superiority power wheel

I picked up a lovely BRK Atomic carbine a month back here on AGN.
Plan was to create an alternative <12 fpe HFT pistol.
It came to me shooting 8.4’s at <12 fpe but I wanted to shoot 13.4’s to buck the wind better.
AOA has a division called Air Superiority which makes an add on adjustable power wheel (hammer spring adjuster) which allows you to remove the carbine stock for pistol conversion.
This morning I removed the stock and installed the power adjuster SUPER EASY!
Voila I now have an Atomic pistol.
The transfer port has 3 settings, low, medium, high and the powerful wheel has ???? Let’s just say 8 as for my purposes I took it to max to tune and do my comparative chrono tests with 3 different weight pellets and worked my way down.
I ended up leaving the power wheel at 8 as it was very accurate with 13.4’s with transfer port wide open and power wheel on 8. For HFT pistol class I will reduce as appropriate to be sub <12 fpe.
Zero was at 25 yards and my group at that distance was 3/8”. If you study my work sheet below, it gives all the specifics.
I used the magazine for all my testing.
Although I have to remove the moderator to be hft pistol legal, it’s crazy quiet with this Weihrauch attached.
If anyone else has this setup I’d be interested in hearing about your settings and results.
IMG_8432.jpeg
IMG_8439.jpeg
 
Last edited:
Mine is similar, but I haven't gone down the rabbit hole on power as yet. So far I haven’t gone down only shot close distances in basement.

View attachment 511622
I haven’t done my shot count work yet but I’m well aware that tube guns have a limited shot count especially when bumping the power up.
 
There’s no going back now!
Hey I just noticed what you did to your cocking handle - cool!
Just placed it on the "top" of the lever arm.
Makes it easier to grab / cock with the left hand.


Did that trigger come with yours or is it after market? What weight pull is it?
Yes sir, it came with my gun.
Don't have a gauge, so don't know the pull weight.

Mike
 
  • Like
Reactions: rsfrid