How to Determine Proper Bullet Seating Depth for YOUR Gun

Proper Bullet Seating Depth Banner


  1. A cartridge case that has been fired in your gun, and not resized.
  2. A bullet of the type to be used, with a full, undamaged nose.
  3. Calipers.
  4. A dark felt-tipped marker.




Step 1

Insert the bullet into the neck of the fired case. It should fall freely into the case, with no resistance.

Step 2

Remove the bullet from the fired case and press the case neck lightly on a flat surface to create a small indentation or flat surface in the case neck so that it will grip the bullet.

Step 3

Insert the bullet, base first, into the case so that the case just grips the bullet by itself.  Just get the bullet started into the case—don’t seat it too deeply.

Step 4

Completely color the bullet with the marker.

Step 5

Gently insert the case and bullet into the chamber of the firearm, and close the action. Do not pull the trigger.

Step 6

Carefully open the action and gently remove the case.

Step 7

Retrieve the bullet. It will either be stuck up in the lands of the barrel or still in the case. If the bullet is stuck in the lands, it can be removed by tapping the butt of the gun on the ground. Or, it can be dislodged by gently pushing it out with a cleaning rod. If the bullet is still in the case, then gently remove it with your fingers, taking care not to mar the ink, and proceed to step 8.

Step 8

During Step 5, the lands will have contacted the bullet and pushed it back into the case, causing the case neck to scrape the ink off of the bearing surface of the bullet. Simply push the bullet into the case until the edge of the case neck is just to where the ink has been scraped off.

Step 9

Carefully measure the overall length of the dummy cartridge. This overall length is called your “rifle seating” depth. It is where the bullet contacts the lands of the barrel. This length is different for every different type of bullet, as it depends upon the shape of the ogive (the taper) and the meplat (the tip of the nose) of the bullet. This process should be repeated three or four times to obtain a consistent average.

Step 10

A. Set your seating die to seat at a depth between .015 and .03 inches less than your rifle seating depth.

B. Lightweight bullets may need to be seated further from the rifling. A depth of one bullet diameter inside the case neck gives good alignment and neck tension for ignition.

C. The overall length must be short enough to function through the magazine.


Digital Reloading Guide 8 Released


The All New Digital Reloading Guide 8

The new and improved Digital Reloading Guide 8, designed for the best user experience.  The days of using just a PDF download to explore pages and pages of reloading data are gone.

The new digital format allows for 5 different ways to explore the Nosler Reloading Guide 8:

Online access through your account

  • Perfect for Tablets and Mobile Devices

Includes 4 options of downloadable versions

  • You have unlimited access to all versions
  • PC Desktop Version
  • MAC Desktop Version
  • PDF Download
  • PDF Alternative Download

Compatible with Touch Screen Devices

PDF version now contains links in Table of Contents and on the Cartridge Index page to other pages in the document.


Digital Reloading Guide 8 New Features:

Quick Access to whatever you are looking for

  • Links are included on the Table of Contents page
  • Links to each cartridge from the Cartridge Index page

Excellent Tools

  • Turn on and off the Table of Contents
  • View Pages in Tile Mode
  • Bookmark your favorite pages
  • Print a page for your records
  • Turn on and off full screen mode
  • Zoom Control
  • Page Viewing Navigation


  • Find what pages your favorite cartridge is listed
  • Search by Story Author

Bullet Cutaway Pages

  • The bullet cutaway pages have direct links to for more information on particular bullets


Reloading Guide 8 Hot Off the Press

Nosler Reloading Guide 8 Picture




All the data you’ve been dreaming of, plus a few pictures.

Introducing Nosler Reloading Guide 8, hot off the press with AccuBond Long Range data.  This expanded edition also features 26 Nosler, 28 Nosler and 30 Nosler, plus all the latest powders and updated introductions for every cartridge.  It’s enough new material to send every handloader’s pulse racing.


Varmint Hunting: 22-250 Rem by John A. Nosler

John A Nosler Varmint Hunting

The .22-250 Remington is among my favorite cartridges for long range varmint shooting, having used it in its various forms over the past fifty years. 

Originally based on the 250-3000 Savage, this highly accurate, twenty-two caliber wildcat was standardized by Remington in the mid-sixties.  I don’t consider the .22-250 a dependable deer cartridge, even though it will penetrate plate steel better than the .30-06.  The lack of bullet weight really limits this and .22s to coyote sized animals.

In Central Oregon, we have some excellent rock chuck shooting with the added bonus of a healthy coyote population.  This is heaven for the .22-250. 

A good friend of mine, who also has the incurable addiction for shooting chucks, was recently with me at my favorite shady spot doing what varmint hunters love to do best. 


Give me a well-tuned rifle in .22-250, set me loose in varmint country and you’ll see where this cartridge really shines!

- John A. Nosler

We had one rock wall full of rock chucks at about 100 yards and another, out past 300 yards totally covered with the big brutes.  I was shooting my favorite .22-250; my buddy was shooting his pet .223. After felling some fifty chucks, we took a breather and ate a sandwich.   

Hunting Story Map

During this quiet time, my friend spotted a white rock embedded near the top of the 300-plus-yard wall.  After a little spirited conversation, my friend finally bet a fancy dinner that I couldn’t dust that little white rock.  The sporting man that I am, I upped the ante to include drinks if I could nail it on the first shot.  After much care resting my rifle, I squeezed the trigger and … the dust flew!  Boy, that good old .22-250 continues to amaze me.


Reloading Guide Generic Photo

Flashback Story
The 22-250 Remington
Reloading Guide 4

By: John A. Nosler

3 Hogs in One Shot: 300 RUM by John R. Nosler

John Nosler Hog Hunt

Something phenomenal (in my humble opinion) happened in 1999. Remington decided to take a 404 Jeffery case and modify it. The end result was a 30 caliber magnum that was near the top in terms of velocity, energy and accuracy. As part of the “go faster, hit ‘em harder” generation, I was mesmerized. Load that case with my personal favorite of IMR7828 and I am confident that between the near 2 tons of energy and jaw-dropping power of the 200 grain AccuBond bullet, there isn’t anything in North America that would stand in its way.


One of my most memorable stories of the 300 RUM goes back to 2002. We were testing the AccuBond bullet prior to its introduction. The test medium was wild hogs in Texas, and for those of you who don’t know, they are the poor man’s grizzly bear, tough and mad at the world. This particular ranch in Texas has such an abundant hog population that the opportunity presented itself for not one hog, nor a double, but a triple. A feat truly worthy of the mighty “Ultra” accompanied by the perfect magnum bullet, the AccuBond. 


30 Caliber 200 Grain AccuBond


If I didn’t have three witnesses on that shot, followed by three sadistic giggles that usually only accompanies prairie dog hunting, I wouldn’t have believed it myself. The bullet tore through all three hogs, delivering serious shock to the front two and mortally wounding the third.  One shot, three kills. A flawless test, and with it began my love of the 300 Remington Ultra Magnum. Whether I was hunting deer at long range, caribou in the arctic, or poor man’s grizz in Texas, it has become a cartridge that always is given consideration when I am off on a hunting trip.


Nosler Reloading Guide 6

Flashback Story
The 300 Remington Ultra Magnum
Reloading Guide 6  |  Page. 422

By: John R. Nosler


Moose Hunting: 300 H&H Magnum by Bob Nosler

Bob Nosler: Trophy Moose

Josh cut the motor, and let the boat drift over to a big log near the bank. “Bull, cow and one calf,” he whispered as he pointed up stream. The big bull was about 120 yards away when he lowered his majestic head down to the cold Wolf River for a drink. “What do ya think?”, Josh asked. The picture tells the rest of the story, but what it cannot show is my respect for an almost-obsolete cartridge.

Bob Nosler and Josh DeLine

(My guide, Josh DeLine, is pictured behind me.) 

We were celebrating the 60th anniversary of the Company by hunting with some of Dad’s very first Partition bullets. 

My rifle was a gift from John Andre, one of our hunting partners, and owner of Shoshone Wilderness Adventures.  It was a Winchester Model 70 that was manufactured in 1946 - the same year that I made my appearance in the Nosler family. The scope was a vintage Lyman Alaskan, with the side mount base. This was as close to Dad’s original set-up as I could get, and it was a thrill to retrace just a few of his steps into the moose country that started it all. 


Originally dubbed “Holland’s Super 30”, this pioneer speedster made its debut to the hunting world in 1925.  It was the first of the 30 caliber belted magnums, and was a mixed blessing for hunters in the nineteen-thirties and forties due to the thin jacketed bullets of the day.


Partition 30 Caliber 220 Grain Bullets

The story is almost a legend, but a mud-caked moose, a 300 Magnum, and an un-named bullet of the day were the very reasons why Dad began to sketch his  revolutionary bullet designs during the mid nineteen forties.  And he was sooo right. Loaded with a Partition, or one of our new AccuBonds, the 300 H&H is as much at home in the modern Yukon as any canoe or float plane.

If you are lucky enough to own one, don’t hesitate to take it out for a nostalgic hunt. And, don’t worry about whether you have enough gun - you do!


Nosler Reloading Guide 6

Flashback Story
The 300 H&H Magnum
Reloading Guide 6  |  Page. 390

By: Bob Nosler


Mountain Goat Hunting: 7mm Rem Mag by John A. Nosler

John A. Nosler: Notice the Top Left Hand Corner

John A. Nosler: Notice the Top Left Hand Corner

After shooting the big 300 H&H for so many British Columbia trips, I began eyeing the 7mm caliber. A few companies loaded the 7x57mm cartridge, so I found a rifle in 7x57 to try. It was fun to shoot. I began wondering what it would be like in a larger case.

I was already making some Partition bullets and I strongly felt the Partitions would save the life of the 300 H&H cartridge, so I managed to have some Partitions in .284 diameter 160 gr. bullets made ready. The Winchester Model 70 rifle came out with an extra-long action to accommodate the 300 H&H-length cartridge. No other actions were long enough, so I shortened the 300 case to 30-06 length and formed it to take the .284 diameter bullet. This cartridge loaded with the 4350 powder was fun to shoot, and with the Partition bullets, looked like it would be an excellent cartridge for rather large game.


So I was off to British Columbia to try the 160 grain Partitions. They had tested out very well in the test that all Partition bullets must pass, so I was very interested in their big game performance. They were much more fun to shoot than the big 30 caliber. 


So I must admit my favorite rifles are chambered in 7mm Caliber.  ~John A. Nosler


The first game I wanted to hunt was the Rocky Mountain goat. The wild goats were difficult to get up on so the best I could do was around 300 yards. I had time to shoot so I took a good rest over my folded coat on a rocky cliff and fired. The goat just stood there for about 30 seconds and then fell over. I was very happy about the way the goat went down. 

7mm Partion 160 Grain Bullets

Upon examination inside the goat I was very pleased with the bullet’s performance. The lungs were all bloody with much other tissue damage. The bullet went out the other side: excellent performance! The Partition bullets taught me that a big moose was not hard to kill, it was just a matter of getting the bullet to get through the heavy boned shoulders.


With my introduction of the plastic tip to the bullet world, which the bullet industry went all out for, the 7mm caliber became my favorite fun gun. I could make long-range hits so much easier. Recoil was a minimal problem. So I must admit my favorite rifles are chambered in 7mm caliber.


Nosler Reloading Guide 6

Flashback Story
The 7mm Remington Magnum
Reloading Guide 6  |  Page. 332

By: John A. Nosler