Equipment & Gear > Guns and Ammo

Bullet Seating Depth

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sakoshooter:
The link that Killbilly posted above has some great info, especially if you read all the way to the bottom. I'm copying and pasting one such post:
Thanks for your question.

To answer you, seating depth in relation to the distance from the lands should not affect the efficiency of the powder burning completely, if it is a powder/bullet combination that has performed well for you in previous occasions. However, the closer you are to the lands, you will see an increase in pressure, and this should be approached with caution, especially with hot/compressed loads. If you want to try closer to the lands, we suggest reducing your load for safety reasons.

Many bullets perform very well with some jump. In most of my rifles I have found that jump of .020″ to .030″ has been the “sweet spot”. This will differ from rifle to rifle, and bullet to bullet.

As for your nickel plated brass, we suggest it not be reloaded for a few reasons: First of all it is hard on dies, the nickel is harder than brass, and can scratch and ruin a good set of dies. Second, it is hard to size, it must be undersized to achieve the proper sizing. Third, nickel plating is used for corrosive conditions such as hunting, and is designed to be shot and “left”.

I hope this helps you out. If you have further questions, please feel free to contact our reloading technicians at 1-800-717-8211.

Good Shooting

Pete Petros
Lead Reloading Technician
Sinclair International

What I get out of this one post is that a cartridge with a COAL .025 off the lands might be a great place to start.

high country:
It depends on the rifle, bullet and intention of the gun for me. I have found tsx bullets shoot well with .125 in my ultra's, yet bergers seem to want to make out with the lands.

sakoshooter:
High Country, You're right. I was mainly posting the reply above because of the bullet seating depth info in it posted by Sinclair International's Lead Reloading Technician.

Another copied/pasted:  I use the rod down the barrel method. When using a brass rod the way I mark it is with a sharp knife held flat across the muzzle and pressed into the brass rod until a mark is left on the rod. The mark is razor thin and consistent and the only challenge to accurate measurement is getting the dial calipher blades exactly aligned to the marks when you measure between the lines left by knife. With a cleaning rod I usually place some masking or other tape on the rod where the knife contacts to make mark easier to see.

The above post was in relation to holding a bullet against the lands with a dowel and sliding a rod down the barrel from the muzzle end. First against the cocked bolt face, next, with bolt removed, against the bullet tip that would be just lightly held against the lands with a dowel.
I just went thru every caliber, weight and style of bullet on my bench for 3 rifles today. Measured exact CAOL. Wrote them down for future reference. Now I can set up a dummy round for each bullet and know for sure exactly how far off the lands I am.
Thanx for the info guys. I'm going shootin tomorrow - weather providing.

sakoshooter:
I just loaded a batch for the range in 30-06 with 165gr Swift Scirroco IIs and 168gr Barnes TTSXs and used the rod down the barrel for seating depth. Simple and I'm sold on it without buying anything further than I already had in my shop. Accurate to within .001 or .002 I'd say. Basically as accurate as a person can see.
Does anyone else use this method?

carpsniperg2:
Never heard of that method. How does it work? I would be interested 2 hear more about it.

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