How close to zero does it get you with a scope?

Very close with my red dots. I set a table up om one end of a tweleve foot room. Set and locked my rifle into a gun vice. Inserted the bore Laser into the chamber. With bore light show on the far wall I aligned my red dot on top of it. I did this with a 12 gauge pump, several .223 rifles and a 9mm carbine. All using different bore sights of course. At range everything was within two clicks or right on. I did adjust the .223 and 9 to shoot a little higher. Twelve gauge was right on for twelve feet, which is good range for a home shotgun.

Does this one turn on when trigger is pulled or does it stay on all time once place in chamber?

The laser turns on when the batteries are inserted and the cap is screwed on. There is no switch. You won't want to pull the trigger when this is in the chamber, as the back of the boresighter is brass and likely won't react well to a firing pin strike. It works pretty well. Keep in mind you just use this to align your sights and then eject the round. To store it you unscrew the rear cap and remove the batteries.

What do I need to bore sight a .410 shockwave?

a .45 long colt bore sight could possibly work since there are revolvers that can fire both .45lc and 410

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MidTen Bore Sight 12 Gauge Laser Boresighter Red/Green Dot Zeroing Laser Bore Sight with Extra Batteries

MidTen Bore Sight 12 Gauge Laser Boresighter Red/Green Dot Zeroing Laser Bore Sight with Extra Batteries

Product ID: 466921516

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Details

Brand
MidTen
Color
Green Rose
Style
Green Laser
Sport
Airsoft
Item Weight
0.16 Kilograms
Material
Brass

🎯Precision zeroing up to 300 yards

🔋9 LR44 batteries included, 2-hour runtime

🛠️Durable solid brass, perfect 12 gauge fit

Description

🎯 Lock in your shot with laser precision—because your aim deserves the best.

READY OUT OF THE BOX - Includes 3 full sets of LR44 batteries so you’re always powered up and ready to zero in.
BUILT TO LAST BUILT TO FIT - Premium solid brass construction guarantees a snug, chamber-specific 12 gauge fit for consistent performance.
PINPOINT ACCURACY EVERY TIME - Class IIIA laser with <5mW power ensures safe, sharp targeting for flawless zeroing.
SAVE TIME MONEY ON RANGE DAYS - Quickly align your sights without live firing—maximize efficiency and minimize costly ammo waste.
DUAL LASER OPTIONS FOR ULTIMATE CONTRAST - Choose vibrant green (510-540nm) for superior visibility on red dot optics—never miss a shot.

The MidTen 12 Gauge Laser Boresighter features a Class IIIA green laser (510-540nm) designed for precise zeroing of optics and iron sights up to 300 yards. Crafted from solid brass for a perfect 12 gauge chamber fit, it includes 9 LR44 batteries providing up to 2 hours of continuous use. Ideal for hunters and airsoft enthusiasts seeking fast, reliable sight alignment with minimal ammo expenditure.

Specifications

Brand	MidTen
Color	Green, Rose Gold
Style	Green Laser
Sport	Airsoft, Hunting
Item Weight	0.16 Kilograms
Material	Brass
Compatible Devices	Handgun
Mounting Type	Picatinny Mount
Night vision	No
Model Name	12 gauge green laser bore sight
Manufacturer	MidTen
Reticle Type	Dot
Item Package Dimensions L x W x H	3.31 x 2.28 x 1.22 inches
Package Weight	0.17 Kilograms
Item Dimensions LxWxH	3.35 x 7.48 x 0.98 inches
Brand Name	MidTen
Included Components	1 x green laser boresighter 12 gauge, 9 x LR44 batteries