What is the thread size on the end. I want to use brass fired in my chamber to make my own modified brass

The tap is UNS 5/16 - 36. I bought the tap and tried several times. Then I sent in two brass cases (fired in my chamber) of each caliber to Hornady and they made ones that worked. Unless you are a skilled machinist with a lathe or tools to drill the case out perfectly straight, you are wasting your money on a tap. I did not have the proper tools and failed. Hornady charges $35 a case and was quick to get them back to me.

How do you know the bullet is in the same position in the case after you pull it out that it was in while chambered?

Once you are comfortable the ogive is making contact with the lands, tighten the thumbscrew on the shaft. The bullet seldom comes out with the case, so locking the shaft allows you to place the bullet back in the case to get your measurement. I hope this helps.

will this work on a Marlin Guide Gun?

You have to be able to take the bolt out and get straight access to the chamber so I don't believe it would work on lever guns. However, not sure on your model of lever, if you can get the bolt out then it would work.

Can I tap a piece of brass I have with the hornady “stuck vase removal tap”? Will the tap allow case to attach to this tool?

I don't have a Hornady stuck case removal tool so I have no idea if the diameter and pitch of the tap is compatible with the lock and load tool threads. But I wanted a couple of different caliber tapped cases for my lock and load and took those caliber brass and the tool to a local machine shop and they made perfectly compatible cases fr me cheaply.

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OAL Gauge Straight C1000

Product ID: 6750889

Details

Brand
Hornady
Item Weight
0.01 Ounces
Item dimensions L x W x H
17 x 5 x 2
Number of Items
1
Thread Type
Unc

📏Precision seating depth control

🔩Aluminum red housing for durability

⚙️Threaded for custom chamber fit

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COP 361044

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Description

🎯 Elevate your reload game with precision that hits the mark every time!

BUILT TO LAST - Durable aluminum red housing ensures long-term reliability and easy visibility.
TRUSTED BY PROS - Hornady’s Lock-N-Load system backed by a no-risk lifetime warranty and 4.7-star user acclaim.
MASTER YOUR ACCURACY - Regulates bullet seating depth to optimize 'jump' to rifling for pinpoint precision.
CUSTOM FIT EVERY TIME - Threaded design requires a Modified Case (sold separately) for perfect chamber compatibility.
UNIVERSAL COMPATIBILITY - Ideal for all bolt-action and single-shot firearms with straight-line chamber access.

The Hornady C1000 Lock-N-Load OAL Length Gauge is a precision tool designed to regulate bullet seating depth and optimize the 'jump' to rifling, significantly enhancing firearm accuracy. Featuring a durable aluminum red housing and a threaded design for custom chamber fit (Modified Case sold separately), it is compatible with all bolt-action and single-shot firearms with straight-line chamber access. Trusted by professionals and backed by a lifetime warranty, this gauge is a must-have for serious reloaders seeking consistent, tack-driver performance.

Specifications

ASIN	B000PD01SI
Best Sellers Rank	#104,713 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #449 in Gunsmithing Tools
Brand Name	Hornady
Customer Reviews	4.7 4.7 out of 5 stars (1,364)
Global Trade Identification Number	00090255704006
Included Components	OAL Gauge
Item Dimensions	17 x 5 x 2 inches
Item Type Name	Hornady, Lock-N-Load OAL Gauge, Straight
Item Weight	0.01 Ounces
Manufacturer	Hornady
Model	C1000
Part Number	C1000
Thread Style	Unc
UPC	090255704006
Unit Count	1.00 Ounce
Warranty Description	No-Risk, Lifetime Warranty

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