The “CHOKE – in – CHOKE” Inner Profile of BRAIN Choke Tubes is the biggest breakthrough in the history of chokes, absolutely revolutionary and it is composed by three main sections:
  • the Pre-Choking Section (“prepares” the shot column for entrering the Expansion Section)
  • the Expansion Section (expands the volume of the shot column pulling pellets from core to periphery)
  • the Final Choking Section (forms the desired pattern diameter)

All chokes until now have exactly the same inner profile design, the conventional conical – parallel or just conical. Regardless of the “..our own special design” or “..super geometry” etc advertised by the various choke tube manufacturers, purely for marketing reasons but without saying how or where they differ from each other.

It’s a common knowledge that virtually all conventional chokes obey to the “Dense Core Rule”: almost 2/3 of the pellets go in an “over killing” central circle of the 1/3 of the pattern surface and the rest 1/3 of them try to cover the peripheral 2/3 of the pattern surface, forming a “weak” or “just injuring” fringe with many empty spaces.

Consequently, with all conventional chokes until now, if you want to secure success, you have to be very accurate and manage to place your pattern’s core on your target, the fringe may not always “supply” adequate number of pellets to get the job done.

But this happened until today. Now, there are the BRAIN Choke Tubes with the answer to the “Dense Core” problem which all ballistic specialists were trying to solve since the invention of choke, the “CHOKE in CHOKE” inner profile design.


BRAIN Chokes start with a tightening section before the expansion and this makes a very big difference! This first tightening section creates a dense core but, as the shot load passes through the expansion section drives more pellets from core to periphery and, because it enters the final tightening being at a phase of expanding, there is no more a dense core at the final pattern.

BRAIN Chokes have been ranked first in ALL published comparison tests all over the World
compared to all conventional chokes

Core Density (= 20 “ circle / 30 “ circle)

EU TEST 2019

Less Core Density = more enhanced periphery = more uniform pattern
BRAIN: 1,62
BRILEY: 1,96
KICK’ S: 2,09
Average of 10 shots / all chokes tight modified
36,5 m – 40 yards / 36 gr – 1 1/4 oz

Central thickening at 40 yards


Note: Both patterns are tests on 1m x 1m / 40″ X 40″ pattern board at 36,5 m / 40 yrds
shotshells with 36 gr No 6 lead shot, both with same constriction chokes

BRAIN Choke Tubes are the first and only choke tubes in the World that produce absolutely uniform patterns without the slightest distribution density difference between core and periphery. This way, almost the whole pattern surface becomes actually effective, increasing impressively your shots-to-kills ratio. 

Our intense and exhausting tests (repeatedly verified by many independent shotgun specialists), show 5 – 20 % success increase, depending on the shooter’s skill level (the lower the level, the bigger the increase).