30BR seating depth test

[Kevin1990]

So I did a seating depth test today and was wondering if I could get some opinions?

My touch point using my comparator and the wheeler method is 1.670. So I loaded 9 rounds to do 3x3 with each seating depth. They were 1.700, 1.690, 1.680, 1.670, and 1.660

Below are pictures of the results. After all of my reading I thought I'd find the sweet spot with a good jam, but it appears my groups are best at TP.

Also, if you're wondering, I do 3 groups because my range is 30 mins away and if I pulled a shot which I do on occasion, I'd be able to redo that group. Today went okay though. Light breeze and gusts of wind about 6-8mph. Wind flags were in use.

Questions:

What seating depth would you run with?

This is my first 30BR. If I'm at just touch, will I be chasing the lands often? I feel like I'm doing that often with other cartridges.

Thanks fellas


1.660



1.670


1.680







1.690



1.700

 

[AlNyhus]

Hard not to like 1.670".

 

[Kevin1990]

Hard not to like 1.670".

Hey Al, in your experience how fast or slow does throat erosion occur in the 30BR? I like 1.670 as well, but I was hoping for a hard jam so I could set it and forget it for a little bit.

 

[AlNyhus]

Kevin, I just retired a Kreiger 17 twist with 5,000+ rounds through it. By my notes, the throat is .025 forward. -Al

 

[Bill Norris]

30BR throats don't move very much. One prominent 30BR founding father said he had 7000 + rounds down the tube on a rifle he owned and it was still winning matches.