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How do you find that screaming Accurate Load??

 
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  #1  
Old 05-05-2010, 12:09 PM
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How do you find that screaming Accurate Load??

Okay I have a 300 RUM and I have a real nice load already at 87 grains of retumbo but I'm not running any faster than some powder packed 300 winmags ! I need more speed I've read in the past that Their is two nodes (whatever that means) one is an accurate load at the bottom (that's were I believe I'm at with this load) and then theirs supposedly one in the high side. I can't remeber if I read that kirby starts out in the red as far as the loading manuels call and then backs that load down 2 grains and finds a good load in that area. Correct me if i'm wrong but if you load this way I'm all ears . You are also welcome to share your load technique as well . Thanks for looking

BigBuck
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Old 05-05-2010, 05:37 PM
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Re: How do you find that screaming Accurate Load??

I use a combination of blind luck and good fortune! It's been working so far .
I've got numerous rifles that will put 3 shots in 1-2" at 565yds.

Actually I use quickload and determine the best powders and target velocity that will get me to the desired node( which is the optimum barrel time-OBT).

I do pressure workups at the range and shoot through a chrono so I can get actual data so that I can tweak the program to fit my exact parameters and results.

Then I shoot groups to bracket the obt powder charge to find the optimum charge weight(ocw).

I find the ocw and do a seating depth test to find the opimum seating depth.
This should bring the shots into one nice hole.

I then shoot a ladder at 565yds bracketing the charge again to see which powder charge shows the least vertical at longer range. Usually I change the powder charge about 1% until I find a load with very little vertical.

I doesn't take many rounds or many groups to get a good load. Unless your rifle just doesn't like a bullet, but you will know that pretty quick.

If you'd like you can send me your info and I can work something up.

I need the cartridge, barrel length, bullet,oal,powder, water capacity, and if you are on the lands or off of them.
If you have load and velocity data it would really help.
Then I can see what might bring you to the higher node.
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Old 05-07-2010, 08:44 AM
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Re: How do you find that screaming Accurate Load??

Quote:
Originally Posted by RockZ View Post
I use a combination of blind luck and good fortune! It's been working so far .
I've got numerous rifles that will put 3 shots in 1-2" at 565yds.

Actually I use quickload and determine the best powders and target velocity that will get me to the desired node( which is the optimum barrel time-OBT).

I do pressure workups at the range and shoot through a chrono so I can get actual data so that I can tweak the program to fit my exact parameters and results.

Then I shoot groups to bracket the obt powder charge to find the optimum charge weight(ocw).

I find the ocw and do a seating depth test to find the opimum seating depth.
This should bring the shots into one nice hole.

I then shoot a ladder at 565yds bracketing the charge again to see which powder charge shows the least vertical at longer range. Usually I change the powder charge about 1% until I find a load with very little vertical.

I doesn't take many rounds or many groups to get a good load. Unless your rifle just doesn't like a bullet, but you will know that pretty quick.

If you'd like you can send me your info and I can work something up.

I need the cartridge, barrel length, bullet,oal,powder, water capacity, and if you are on the lands or off of them.
If you have load and velocity data it would really help.
Then I can see what might bring you to the higher node.

Thanks PM sent.....

BigBuck
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Old 05-07-2010, 08:59 AM
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Re: How do you find that screaming Accurate Load??

bigbuck, have you read the sticky on ladder testing. I have yet to try it my self but it seems like it may me a very good method.

For now I find the max load then adjust it down a grain or two, then I shoot different COAL then I load a bunch of different primer and finally I adjust seating depth, it works but I burn a lot of components.
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Old 05-07-2010, 10:33 AM
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Re: How do you find that screaming Accurate Load??

Quote:
Originally Posted by bigngreen View Post
bigbuck, have you read the sticky on ladder testing. I have yet to try it my self but it seems like it may me a very good method.

For now I find the max load then adjust it down a grain or two, then I shoot different COAL then I load a bunch of different primer and finally I adjust seating depth, it works but I burn a lot of components.
Thanks bigngreen, i'll read the sticky . I usually find a load kindof like you do but i start from the lowest load data from my loading manuals and i let the paper tell me when to stop thing is I'm nopt running any faster than some 300 win mags . I'm going to see just how fast I can run the 210's and keep nice groups . I think i'll start a 200 yards and then move out to 500 then i'll try to get a tight group @ 500 . What would you call an extremely tight 3 shot group at 500 ?

BigBuck
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Old 05-07-2010, 11:03 AM
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Re: How do you find that screaming Accurate Load??

1/2 MOA or under @ 500 yards.

Stick with RockZ, from reading his post his system is alot like mine. He'll get you where you want to be if you and your rifle are up to it.
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Old 05-07-2010, 11:16 AM
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Re: How do you find that screaming Accurate Load??

I don't stop working up till I hit max as comfirmed by chonograph and observed pressure signs then I look for the highest pressure with the best accuracy. I group shoot over a chronograph while working up a load, so far the highest pressure and accuracy node corespond with low SD and ES.
Then I start shooting at distance and it seems to work OK and based on just a few years of trying to get extreem accuracy and speed for LRH.

I like the longer range groups to reflect what the gun is capable of, if I shoot 1/2 MOA at 100 yrds I want to see it farther down range. Or MOC at 500yrds, Minute Of Coyote

I would be tweeked if I was shooting a RUM at winmag velocity!!! .
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