Winchester Repeating Arms X Pump (SXP) - Manual (Page 23)

All Super X Pump shotgun barrels (except Defender
models) are threaded to accept the Invector-Plus ™ choke
tube system. WinChoke ® , Standard Invector ™ and
Invector-Plus tubes are not interchangeable. Confirm the
choke system of your shotgun by looking on the right side
of the barrel where the specifications are inscribed, where
the choke markings are normally located.
The constriction of each choke tube is indicated twice on
the choke tube: on the side of the tube, and indicated
with a notch code on the top rim of the tube. The
included universal choke tube wrench is used to remove
and install choke tubes.
Invector-Plus and Standard Invector choke tubes are
compatible with factory ammunition that has been
loaded in compliance with SAAMI specifications,
including magnum lead and steel shot loads, sabots and
shotgun slug loads.
Replacement and additional tubes and wrenches are
available from your Winchester Rifle and Shotguns
dealer, or by contacting the Winchester Repeating
Arms Customer Service Department. See page 30
for contact information.
c hoke t ube s election
To help you choose the correct choke tube for each
hunting and shooting situation, all Invector-Plus choke
tubes are inscribed on the side with the patterns they
produce with both lead and steel shot. Each Invector tube
also has notches in the top rim of the tube (Figure 11).
21
N o N ot c h e s
F i v e N ot c h e s
F o u r N ot c h e s
t h r e e N ot c h e s
t w o N ot c h e s
o N e N ot c h
r i m
N ot c h e s
Pat t e r N w i t h
L e a d s h ot
Pat t e r N w i t h
s t e e L s h ot
e x t e N d e d * * x - F u L L t u r k e y * *
i F u L L *
i i i m P. m o d i F i e d F u L L 1
i i i m o d i F i e d F u L L 1
i i i i i m P. c y L i N d e r m o d i F i e d
i i i i i s k e e t i m P. c y L i N d e r
N o N ot c h e s c y L i N d e r c y L i N d e r
* Not for use with steel shot. Using an over-tight choke constriction with
steel shot will result in an ineffective “blown” pattern.
** Extra Full Special, extended with ports. Do not use with steel shot.
1 When more than one choke tube is listed for a given steel shot pattern, use
the more open choke listed for high velocity, larger shot size steel loads.
FIGURE 11