Brocock power!

Jump to latest Follow Reply
vmaxpro

vmaxpro

Member
Sep 11, 2019
1,082
146
Virginia, United States
1568752666_365758605d81441adb25f4.65253950_313F0BA8-32EA-4E3C-8845-7C91B2DC23C3.jpeg


New here, any brocock fans in here! Ive got some work done. External plenum, lightweight ssg hammer with peek striker/plunger, huma bottle reg, and some porting for now. Ive got some different tunes, accuracy tune is jsb heavy .25 34gr at 940fps. Holds moa at 100 most days. And a hunting tune with 43.5 nsa slugs at 900fps. I get 50 shots on the accuracy tune and only 20 on the hunting. Id love to see what other people have! Dialed back to 40ftlbs it gets a rediculous amount of shot with jsb 25gr.
 
1568758252_4853489955d8159eccfd855.13224055_P9170241.JPG
1568758265_2589123705d8159f91d15b8.94802524_P9170242.JPG


Compatto Bottle Conversion.

Key Features:

  • Standard Hammer with 13 lb Spring
  • JSAR Custom Machined Cerakoted Bottle Adapter.
  • Can use a PB style regulator or direct to a bottle.
  • 2 Gauges ... Bottle pressure and regulated pressure
  • 2800 PSI output Regulator (4500 PSI in)
  • 500 CC CF Bottle
  • JSAR Raptor Style barrel Tensioning system.
  • CF Tubing Sleeve over barrel for tensioning with a JSAR custom polymer bushing at the rear in front of the breech.
  • 24" LW Polygonal rifled unchoked barrel for slugs machined by JSAR
  • Huggett Belita
  • Silver section behind Belita is the "Barrel Tension Nut"
  • The gun retains 8" of the original 1" i.d. pressure tube as a plenum of slightly over 101 CC's if I calculated it correctly.
  • Also pictured is one of Darko's custom 3D printed magazines in lime green.

Still collecting data for publication. Shooting 34 Grain JSB King Heavies and Nielsen 34 grain slugs I am getting great accuracy on a painted steel plate at 60 yards and about 40 regulated shots. No tuning has been done yet and no velocity measurements have been taken since I just got the adapter back a few days ago.
 
Upvote 0
Man, that is a huge plenum... really cool... what made you go this route, are you hunting with it?
Click to expand...

Mostly hunting! Ive got a few coyotes so far. The nsa slugs just flattened them. I was going to machine a plenum, but for 67$, the little baby tank worked great. If I pull the reg and lean on the hammer it will do 100fpe no prob but I like to switch between pellets and the shot count was horrible.
 
Upvote 0
I found a really cool tune with this setup! Its a fun plinker tune. 145 bar reg, superlight hammer (20g) peak striker/plunger, 6mm stroke. It shoots a jsb 25gr king on the lowest power setting at 760fps and one hole at 40 yards. The best part is I shot 2 mags (20 rnds) and only dropped 10 bar! 200 shots on the reg is gonna be fun! 30 ftlbs is plenty for birds and ground squirrels around here. 

After playing with this I doubled the stroke and shot 34gr right at 910 fps and zero hammer bounce. I think Im going to leave it alone for once. Its just butter smooth now, decent power and pretty effecient. Sure I could get more power but its just so sweet to shoot now. I may just get another one used and set it up similar but rebarrel it for strictly slugs.
 
Upvote 0
Vmaxpro, I'm new to the Brocock Sniper Magnum. What kind of hammer setup is that? I am looking to increase the efficiency a bit on mine and I know you mentioned on another board about porting the ports. I am guessing the transfer ports from valve to barrel. With the hammer system you have and the ports done I would think it would be just what I am looking for. I don't think I am ready to go external plenum just yet but it would be great to see how you did it so I can in the future.

It seems like an ideal setup. Lots of power when you need it and great shot count when you don't.



Thanks,



Jeremy




 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu