Need your guidance on seating depth


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gspn
September 7, 2011, 07:55 PM
I need some guidance on seating depth. I measured my 7mm Mag using an OAL guage and I got 2.76 inches as the point where the lands meet the ogive.

My plan is to try a few different setback distances to see which is the most accurate.

I began by seating my bullets to 2.754. I loaded 30 rounds with this seating depth using 3 different charges of H1000.

I'm going to load another batch and my initial thought was to seat the next group to 2.75. This is just an arbitrary number though...so I thought I might get some THR wisdom on this matter.

I'm not experienced enough to know if changing from 2.754 to 2.75 would make a material difference or not.

What are your thoughts? At what depth should I seat batch number 2 to get the best information out of my next shooting session.

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gspn
September 7, 2011, 11:08 PM
Never mind...I ran out of time...went with 2.75.

Interestingly the last factory box I bought was 2.59...waaaayyy shorter than the 2.76 measured with the oal gauge. I know they have to make them to fit a wide variety of guns but I was still surprised by the difference.

Geckgo
September 7, 2011, 11:16 PM
you will notice a difference if you make the OAL fit the gun, but I don't know about 6 thousanths. For me I'm reloading a hunting rifle, so I put a bullet in a blank, chambered it and let the gun squish the bullet in, put it back in the reloader and twisted down the bullet seater till it stoped, pulled the handle back up, gave another little twist on the seater, loaded another blank, painted it with a marker, no marks, all good. Keep it simple, but I don't know, maybe you are trying to shoot benchrest.

parker51
September 7, 2011, 11:33 PM
Interestingly the last factory box I bought was 2.59...waaaayyy shorter than the 2.76 measured with the oal gauge. I know they have to make them to fit a wide variety of guns but I was still surprised by the difference.

Same bullet, same weight? As long as you aren't pushing the bullet into the lands you shouldn't have a problem. I personally would opt for 2.65 before seating them that close to the lands, but as long as you don't see signs of excessive pressure then you should be okay.

Geckgo
September 7, 2011, 11:42 PM
^-- +1 always check for pressure signs when shooting new recipies

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