Spike Camp

Question - Developing a load

Question - Developing a load
« on: August 30, 2017, 11:24:51 AM »
Just getting started reloading and need some advice.
I want to develop a load for my 300 Weatherby MK V (USA)
Im using once fired Weatherby brass tumbled\polished
Primer pocket and hole uniformed\cleaned
Neck sized
Federal 215m primers
IMR7828scc powder
Nosler Accubond LR 190 bullets

I have determined by measuring and reading that I there is no way to load a round even close to the lands and that Wbys perform best with a jump. So Im looking to load the best I can that will still feeding through the magazine.
I measured my magazine (3.730) and was going to load 3-5 at 3.700, 3.650, 3.600 and 3.550 OCL  to see what it likes better.
My question is when trying different jumps should I at the same time be trying different amounts of powder at each jump or should I try to figure the best jump first and then vary the amount of powder after finding out what jump works the best?
« Last Edit: August 30, 2017, 11:41:49 AM by dartshark »

Re: Question - Developing a load
« Reply #1 on: August 30, 2017, 03:44:05 PM »
Start with the manual's suggested length .  It has almost always worked for me after almost 30 years of loading my own!   :) Welcome to the Nation!

Re: Question - Developing a load
« Reply #2 on: August 30, 2017, 04:00:40 PM »
+1with what bad said , your rifle will also tell you what it likes. All of the Mark V 's are differnt one my like 180 while one may like the 190 what you are useing then again one may like the monoliths like the e tips. With my 300wby mark v limes the 168 e tip it clover leafs at 100yds that load is from the Hodgdon manual with a load of 4955. It is a little bit of trial and error sometimes  but im sure you will figure it out.

BB340

  • *****
  • 1300
    • View Profile
Re: Question - Developing a load
« Reply #3 on: August 30, 2017, 04:05:05 PM »
Welcome to the nation. When I am developing loads I always start by finding an accurate load using different powder weights and powders with the COAL set at factory or book length. Then once I have an accurate load I will begin moving the COAL out further to try and improve on it.
However with my Weatherby calibres I have found that magazine length seems to work the best.
Aussie gun nut.

Blackbear3

  • *****
  • 1853
  • In God We Trust!!!
    • View Profile
Re: Question - Developing a load
« Reply #4 on: August 30, 2017, 04:40:17 PM »
Welcome to the nation. When I am developing loads I always start by finding an accurate load using different powder weights and powders with the COAL set at factory or book length. Then once I have an accurate load I will begin moving the COAL out further to try and improve on it.
However with my Weatherby calibres I have found that magazine length seems to work the best.
+1 on what BB340 said about developing your loads, and Welcome to the Nation!!!
We stand for the Flag, and we kneel for the fallen!!!

Doug-NRA Life Member

dubyam

  • *****
  • 4696
    • View Profile
Re: Question - Developing a load
« Reply #5 on: August 30, 2017, 05:28:09 PM »
I'll add a +2 to the notion of finding a powder charge and then tuning with length changes. And I, too, generally start at mag length and work shorter if need be.
I believe this is a practical world, and in it I can count only on what I can earn.  Therefore I believe in work, hard work. - The Auburn Creed
The older I get, the less stock I place in what men say, and the more I place in what men do. - Andrew Carnegie

257 Shooter

  • *****
  • 649
  • 257 Shooter
    • View Profile
Re: Question - Developing a load
« Reply #6 on: August 30, 2017, 06:12:08 PM »
Good advice so far. It's best to try one variable at a time. More changes and it's hard to
determine what improvements in accuracy are attributed to.

Weatherby cartridges shoot no better or worse than any other cartridges with more or less distance from lands. Bullet shapes and materials have a huge effect on how much distance is best. It' s all trial and error. Good luck.

Re: Question - Developing a load
« Reply #7 on: August 30, 2017, 07:05:48 PM »
+3 to what BB340 said. Find out which powder charge shoots best then play with OAL.

Re: Question - Developing a load
« Reply #8 on: August 31, 2017, 04:38:47 PM »
Thanks to all for the advice!
I got the neck bushings I needed yesterday and the LabRadar chronograph is suppose to be here tomorrow.
Good thing it's a three day weekend, I have lots of time to test and maybe still get out for a day of archery deer, which opens tomorrow.
I love fall :) :) :)

Re: Question - Developing a load
« Reply #9 on: August 31, 2017, 05:55:45 PM »
Keep us posted dartshark.