I have a 6.5x284 Norma weather warrior I load 0.10 off the lands, I uses the Hornady load works great for me !!!
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 and am having a hard time.
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 also 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 delima is where to start with the charges if my seating depth is 3.058" COAL or .010 off the lands?
To summarize, would I be on the safe side starting with 48.0gr of 4831sc based on a seating COAL of 3.058" or .010 off the lands using a Lapua 136-L Scenar bullet?
Btw, Hornady lists a max load of 4831 with their 140 Amax seated to a COAL of 2.880" as 45.9gr.
I am thinking now might be a good time to invest in Quickload
Advice would be appreciated!
"Face Piles of Trials With Smiles"
NRA Life Member
I have a 6.5x284 Norma weather warrior I load 0.10 off the lands, I uses the Hornady load works great for me !!!
That is some wide variation. With all the standard cautions, I think your plan sounds good. I have a swede improved, which has a similar case capacity. I have loaded 51gr of h4831 and a 140gr without incident.
Thanks for the feedback.
What I should have done when I talked with Berger was let them know how far out I could seat the 136 before touching the lands. The data they sent me would probably have changed some for sure. Knowing how much of a pressure difference between seating to 3.180" vs 3.058" would also help
In fact, the more I think about it, the more comfortable I am becoming about starting off with Berger's 49.0gr charge considering Nosler's max is 49.0gr of H4831sc over a 140 grain bullet seated @ 2.980". I could always tie a string to the trigger and hide behind a car or just let a friend fire the first roundj/k
Cheers!
"Face Piles of Trials With Smiles"
NRA Life Member
My OAL with a nosler CC 140 is 2.91", its a short throat reamer. The Nosler 140 rdf shows 3.05" for comparison. I have no real interest in pushing it past 51, I like my brass.
Have you seen this?
http://www.accurateshooter.com/cartridge-guides/65x284/
Thanks for the reply and I have indeed read that article. I would consider myself to be overly conservative when it comes to reloading hence the three days of research without a single 6.5-284 with a 136-L loaded up
In fact, if I could find a good accuracy node between 2700 and 2800fps, I would be very content.
Cheers and happy holidays!
"Face Piles of Trials With Smiles"
NRA Life Member
Bookmarks