Would you guys mind giving me a math check on my load data?
I am trying to figure out a safe starting load for my 6.5-284 Norma 24" CBI 1/8 twist barrel using the Lapua 136-L Scenar bullets.
Here is the situation..
My particular chamber will allow me to seat the 136's to 3.068" COAL which is touching the lands.
Lapua's data shows a COAL with the 136's of 3.110"
Berger sent me data for the 136's with a COAL of 3.180" which I cannot achieve due to a shorter throat.
Here is the data from Berger for the Lapua 136-L's using H4831sc which is the powder I am using.
Bullet: Scenar 136-L
Powder: H4831sc
COAL:3.180"
Start charge: 49.0gr 2657fps
Max Charge:54.2gr 2936fps
Just for reference, Nosler shows the following data for a 140 grain bullet
Powder: H4831sc
COAL: 2.980"
Start charge: 45.0gr 2601fps
Max charge:49.0gr 2769fps
My question is where to start with the charges if my seating depth is 3.058" COAL or .010 off the lands?
Would I be on the safe side starting with 49.0gr of 4831sc based on a seating COAL of 3.058"? I am fairly certain I would be okay starting with 49.0gr but it is always nice to hear opinions from others.
Advice would be appreciated!
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I am trying to figure out a safe starting load for my 6.5-284 Norma 24" CBI 1/8 twist barrel using the Lapua 136-L Scenar bullets.
Here is the situation..
My particular chamber will allow me to seat the 136's to 3.068" COAL which is touching the lands.
Lapua's data shows a COAL with the 136's of 3.110"
Berger sent me data for the 136's with a COAL of 3.180" which I cannot achieve due to a shorter throat.
Here is the data from Berger for the Lapua 136-L's using H4831sc which is the powder I am using.
Bullet: Scenar 136-L
Powder: H4831sc
COAL:3.180"
Start charge: 49.0gr 2657fps
Max Charge:54.2gr 2936fps
Just for reference, Nosler shows the following data for a 140 grain bullet
Powder: H4831sc
COAL: 2.980"
Start charge: 45.0gr 2601fps
Max charge:49.0gr 2769fps
My question is where to start with the charges if my seating depth is 3.058" COAL or .010 off the lands?
Would I be on the safe side starting with 49.0gr of 4831sc based on a seating COAL of 3.058"? I am fairly certain I would be okay starting with 49.0gr but it is always nice to hear opinions from others.
Advice would be appreciated!
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