newbie ? 7.5 swiss

Discussion in 'The Ammo & Reloading Forum' started by ardtxus, Dec 3, 2012.

  1. ardtxus

    ardtxus New Member

    Joined:
    Sep 7, 2012
    Messages:
    6
    my 1st batch of handloads for 7.5 S-R 96/11. can someone explain why the COL is different for these loads. what did i miss in all my reading/research?
    150gr. hornady BTSP, H4895(40.0 - 42.0gr) privi brass, COL 2.790
    180gr. sierra SBT, H4895(37.0 - 39.0gr), prvi brass, COL 2.900
    what i ended up doing is setting the die with a new GP11 round and using that to seat both batches. do i need to punch them down to what the LEE manual says or can i leave them the same as the GP11 COL? tks in advance
  2. woolleyworm

    woolleyworm Moderator

    Joined:
    Feb 23, 2009
    Messages:
    4,938
    Location:
    SW Fort Worth
    COL depends on the style of bullet and can be lengthened depending on your particular chamber. can you post some pictures of the finished rounds and the finished COL? COL listed in the books is typically the minimum; go below that and you're going to have pressure increases beyond what the manual states.
  3. ardtxus

    ardtxus New Member

    Joined:
    Sep 7, 2012
    Messages:
    6
    here's a pic of the finished products. the COL of the GP11 is 3.043. my batch of Sierra 180gr has avg COL of 3.023. my batch of Hornady 150gr avg COL is 3.013. both are BTSpitzers. COLs in my original post are what the book shows, 2.900 & 2.790, respectively. my question is, do I press the bullets all the way down to the book specs for COL or leave them at the length of a round I'm sure works in my rifle, or even longer after I measure where my lands & grooves begin. if I leave them where they are is that going to decrease the pressure since there would be more volume in the case. I'm not looking for a HOT load in this 100+ y.o. rifle, just something consistent. BTW, the LEE pkg insert for the dies shows a Max. Overall Length of 3.051. thanks for your help.

    Attached Files:

  4. woolleyworm

    woolleyworm Moderator

    Joined:
    Feb 23, 2009
    Messages:
    4,938
    Location:
    SW Fort Worth
    As far as the "by the book answer", seat them to manual spec. The bullets should in most cases, seat to the cannelure. I'm going to cheat a little to save myself some typing, so, here's some good reading for ya:

    http://www.thefirearmsforum.com/showthread.php?t=106557&highlight=freebore

    http://www.thefirearmsforum.com/showthread.php?t=97652&highlight=freebore

    http://www.thefirearmsforum.com/showthread.php?t=92772&highlight=freebore

    Understanding and knowing your rifle's freebore/leade is valuable info. As a handloader, you can safely work-up loads to utilize this area to fine tune the load.
Similar Threads
Forum Title Date
The Ammo & Reloading Forum Cleaning media questions from a newbie Mar 24, 2014
The Ammo & Reloading Forum Newbie and Digital Scale Mar 15, 2014
The Ammo & Reloading Forum Digital Powder Scale and Newbie Mar 15, 2014
The Ammo & Reloading Forum Newbie handloader Feb 22, 2014
The Ammo & Reloading Forum need advice for newbie Feb 12, 2014