Measuring Lands?

[Jamie930]

Unfortunately I bet 97% of our membership knows what a BBC is

I would answer this but not on this forum
If you are fluent in emoji you get the jest

 

[mtnbound]

2nd time using a Hornady oal tool to measure the lands on a rifle. First one is a 243 tikka with 103 eldx. When I did it, it was easy to push and then hit the lands hard and stopped. Pretty straightforward. On my seekins 6.5 prc im measuring with 147 elmd and 156 Bergers. With both of these bullets, it seems a little mushy and then hits the lands hard. Do I stop when I feel the slight resistance or when it gets firm?

Load to max magazine length and don’t worry about the lands.

 

[EdP]

I bet 7 members of this forum know what TDC is without a Google search.

I guess it would have been better to say 12 o'clock, 3 o'clock and 9 o'clock.

 

[HairyScandinavian]

I guess it would have been better to say 12 o'clock, 3 o'clock and 9 o'clock.

No, I like TDC... separates the men from the boys.

 

[WeiserBucks]

I guess it would have been better to say 12 o'clock, 3 o'clock and 9 o'clock.

I wasn't saying anything about your process or terminology, just commenting that many people are losing the grip on things that were much more common in the past.

 

[mtnbound]

I ran into a similar situation yesterday. Drilled and taped a 6cm case for the Hornady tool. The 109 eldm stops with a coal of 2.705. I marked a loaded cartridge(coal 2.790) with a sharpie and this is how it came back after being chambered. Approximately 400 rounds on this barrel. I tried Hoppe’s on a patch and an underside bore brush from the chamber side…didn’t get too aggressive with it. Nothing changed when I retried with the tool.
In the photo you can see the ink was cleaned off all the around the bullet just above the case mouth. No rifling marks anywhere on the bullet.
Carbon ring???
How aggressive do I get with it and not create another problem?

View attachment 1034653

How is the rifle grouping with the 109’s set at 2.790?

 

[Silver Wings]

Very well…1-1.1” 10 rounds

 

[nm.otter]

Forgive my ignorance, but how is this OAL gauge + modified case different from the old Loctite on a fired case method?

 

[WeiserBucks]

Forgive my ignorance, but how is this OAL gauge + modified case different from the old Loctite on a fired case method?

It's more convenience than anything for my use.

 

[JFK]

Forgive my ignorance, but how is this OAL gauge + modified case different from the old Loctite on a fired case method?

It’s not functionally different. Only thing with the loctite method is that you need to have a partially sized neck to provide a little resistance. Before I figured that out I got some wildly inaccurate readings. Also with the loctite method you use a fired case so the shoulder is formed the chamber, which is a slight advantage in theory. With the hornady tool I’ll do a given bullet maybe ten times, and they are all within a few thousands and take the avg. Works pretty well.