Bullet seating depth

How inportant is bullet seating depth in re-loading.My father-in-law act's like if it chamber's and extract's normaly it's fine.But I have heard and read about trying to get the bullet close to the groove's for better accuracy.Is there any real difference as long as the O.A.L. is the same and doe's it vari much from gun to gun"the land's and groove's"?

VERY VERY go by your load book different bullets seat at a different depth. That is why there is loading books so that people starting to load will not make a bad loads. ALWAYS go by the book till you know what you are doing. Then you can tweak your loads.

+01

Seating to the rifling is neither necessary or desirable until you have loaded long enough to know what you are doing.

In the mean time, use the suggested seating OAL for the bullet and load shown in your reloading manual.

There is nothing to be gained by fooling with things like OAL until you have mastered all other aspects of what it takes to make accurate loads.

If you notice, the most accurate factory ammo loaded in the world is Match and Varmint ammo.

It is all loaded to a standard OAL that will fit any rifle made anywhere.

rc

After choosing the correct (by the book) components, and starting with a safe load, seating depth is very important. It affects chambering, feeding, accuracy and most important of all, pressure. Seating too deep, especially in some autopistols, can skyrocket pressures. Follow the book.

How will different size bullet's work ?I usually load 200gr.Nosler Accubonds for my 8mm Mauser,but I have also loaded 150gr Hornady's.Will they each be the same lenght since I didn't measure them but never changed any setting's on the Die's?sorry if this sound's dumb but I figured they would be the same lenght without thinking about the lenght of the bullet.

NO, they will not.

Seating dies operate off the adjustable seating stem contact with the bullet ogive, or shape of the curve forward of the full diameter bullet shank.

Almost every bullet manufacturer, and almost every bullet weight, will have a slightly different ogive shape.

You have to use your calipers to measure OAL, and adjust the seating stem accordingly for the correct OAL called for.

rc

When you have established some experience, you can most certainly improve your accuracy by adjusting your overall length.

Some of my long range rifles shoot very well .030" off the rifling, others actually contact the rifling.

Its all about load development, and finding what your particular rifle shoots best.
Take your time, and learn right.
Ask lots of questions in the forums.