Will any of these work with a 300 win mag?

No, there is boresighter in this kit for this gun. But we have an universal boresighter will work it. It works very well for .17-12ga calibers. Please check it here: https://www.amazon.com/StrongTools-BoreSighter-Universal-Boresight-Batteries/dp/B07WQYDNW4/ref=sr_1_2?dchild=1&m=AEKCUJ929YEAX&marketplaceID=ATVPDKIKX0DER&qid=1593645890&s=merchant-items&sr=1-2 Thanks for your asking! Customer Team of StrongTools

Is it necessary to remove the extractor like with other bullet lasers?

I did not remove the extractor I just used the charging handle on my AR to slowly let the bolt carrier set on the laser, if you using a pistol one I just let the slide onto the laser slowly, there are instructions included with the bore sights.

sited .30-06 at about 20ft. how far is actually sited in at 100-200yards?

I sighted at 100 yards. It's best to start out close -- 40 yards or so -- then move out to a longer distance. I think your question lists 20 FEET --- and you probably meant 20 YARDS,

How close will this get you at 100 yards?

I am getting 5 round clusters in .625 inches at 100 meters

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Laser Boresighter Kit

Product ID: 99935709

Details

Brand
StrongTools
Color
Gold
Compatible Devices
Handgun Rifle
Item Weight
7.8 ounces
Magnification Minimum
1 x 7 x
Manufacturer
Dongguan Co.

🎯7 caliber-specific boresights

🔴Class IIIa red laser, 630-680nm wavelength

🛠️Precision brass machining for durability

€ 133.43

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Lock in your shot, lead the pack with precision!

DURABLE BRASS BUILD - Crafted from high-quality brass with precision machining for long-lasting reliability in rugged hunting conditions.
RAPID ZEROING EFFICIENCY - Cut down sighting time dramatically—save money and range visits by achieving perfect bore alignment fast.
COMPLETE READY TO USE KIT - Includes AG3 batteries and 7 boresights, so you’re fully equipped to zero your rifle or handgun out of the box.
CALIBER SPECIFIC PRECISION - 7 laser boresights tailored for popular calibers from 22LR to 45ACP, ensuring perfect fit and accuracy every time.
HIGH VISIBILITY RED DOT LASER - Utilizes a Class IIIa red laser (630-680nm) for clear, sharp aiming points that enhance sighting accuracy.

The StrongTools BoreSighter Kit offers 7 caliber-specific brass boresights with a high-quality Class IIIa red laser for rapid, precise sighting. Designed for rifles and handguns from 22LR to 45ACP, it saves time and money by minimizing live fire zeroing. Durable, ready-to-use with included batteries, this kit is a must-have for serious hunters and shooters aiming for flawless accuracy.

Specifications

ASIN	B07JLFPJPK
Best Sellers Rank	#4,438 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #9 in Hunting Boresighters #1,888 in Hunting Equipment
Brand Name	StrongTools
Color	Gold
Compatible Devices	Handgun, Rifle
Customer Reviews	4.3 4.3 out of 5 stars (1,962)
Item Weight	7.8 ounces
Magnification Minimum	1 x, 7 x
Manufacturer	Dongguan Yijing Optoelectronics Technology Co., Ltd
Material Type	Metal
Model Name	Laser Bore Sight
Model Number	3006, 3030, 308WIN, 223, 9MM
Mounting Type	Picatinny Mount
Number of Items	7
Reticle Type	Dot
Sport Type	Hunting
UPC	681381742255
Unit Count	7 Count

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