bullet seating dies

[pilgrim05]

I have the Lee 4 die set, and have been reloading 115 fmj round nose successfully.  Now I have 2k Precision Delta 124 fmj round nose and notices the profile of the bullet is a bit more pointed. 

My question is: does the seating die need to be modified to accommodate different bullet profiles?  It seems this would also be true for hollow points.

Thanks

[chfields]

Generally you would need to look up the OAL for the different types of bullets you are using......

[Rodolfo Fierro]

Like Chfields said look up the OAL for the BULLET you are using.  In other words if you use Precision Delta's bullet use their OAL.  If you are using Speer or anyone else look up their recommended OAL.  You want to keep the seating depth the same regardless of the bullet's shape. 
The seating die does not matter that much except that you may deform lead bullets if you use something radically different than the actual bullet shape. 

[pilgrim05]

"In other words if you use Precision Delta's bullet use their OAL.  If you are using Speer or anyone else look up their recommended OAL.  You want to keep the seating depth the same regardless of the bullet's shape. "

Excuse the stupid question from this newbie, but isn't the length dependent on the gun's barrel and not on the bullet manufacturer?  When you do that "push test" the length you get is when the ogive hits the lands or the rifling of the barrel and you determine the set back from that.  If the bullet has a sharper taper, the tip is going to go further into the rifling before the ogive hits the lands.  It seems to me like you would need to readjust the seating die for each bullet profile.

I have had a lot of success and enjoyment with loading the 115 fmj, and now that I have a supply of 124's these questions are causing me to hesitate until I feel sure of what I am doing.  I feel comfortable when I understand what is going on.

Thanks for your patience with me...

[chfields]

"In other words if you use Precision Delta's bullet use their OAL.  If you are using Speer or anyone else look up their recommended OAL.  You want to keep the seating depth the same regardless of the bullet's shape. "

Excuse the stupid question from this newbie, but isn't the length dependent on the gun's barrel and not on the bullet manufacturer?  When you do that "push test" the length you get is when the ogive hits the lands or the rifling of the barrel and you determine the set back from that.  If the bullet has a sharper taper, the tip is going to go further into the rifling before the ogive hits the lands.  It seems to me like you would need to readjust the seating die for each bullet profile.

I have had a lot of success and enjoyment with loading the 115 fmj, and now that I have a supply of 124's these questions are causing me to hesitate until I feel sure of what I am doing.  I feel comfortable when I understand what is going on.

Thanks for your patience with me...

The barrel will determine the final OAL, but different bullets affect the OAL differently, depending on the shape. You will need to adjust per bullet type.

[Rodolfo Fierro]

You want to keep the seating depth the same regardless of the bullet's shape. 

This might sound confusing.  What I am trying to describe is keeping the space inside the case the same.  If the space that the powder burns in is the same the pressure will be the same.  Different loaded bullets may look different from the outside, but you want to keep the unseen space inside the case the same.   

[rem1903a3]

I understand what you are saying, but wouldn't different bullets have different bearing surfaces on the barrel which would/could also influence pressures immediately after ignition?