question about flat spot in velocity for 243 winchester

[SAVAGESEVEN]

so i did some testing with loads im shooting a 243 winchester with 26 inch barrel shooting 70 grain nosler ballistic tips with IMR 4350
at a powder charge of 46.0 grains with a muzzle velocity of 3481 at 46.5 grains i have a velocity of 3490 so that tells me their is a flat spot their correct?? being that it only changed 9 fps over .5 grains of powder.. am i doing this correctly ?

 

[spife7980]

 

[AMG04]

Lol I think what Spife is trying to say is we need more data.

Looking for a flat spot can be advantageous, but relying on two shots, one at 46.0 and another at 46.5 grains wouldn't be statistically meaningful. Based on your post I'm not sure if you shot one round at 3481 fps or five rounds with an average of 3481 fps.

Elaborate on your load development process/methodology. How many rounds did you shoot across how many charge weights? What are the averages, extreme spreads, standard deviations, etc for the entire test sequence...

This community can offer so much, but the most useful feedback comes after we analyze the data, and we like lots of data!

 

[SAVAGESEVEN]

i loaded up 5 shot strings in increments of .5 powder charge difference.
started of with 5 shots of 42.0 grains then 5 shots of 42.5 then 5 shots of 43.0 and so on all the way up to 46.5
however i wrote down the average fps of each 5 shot string and at 46.0 and 46.5 at 10 shots total between those two strings
i only noticed 9 fps differance so that tells me their is a node their correct ??? or am i doing this all wrong ??

 

[spife7980]

If you buy into the flat spot velocity theory.. then I guess you're right on track?


Id rather judge by the shots on the paper rather than the numbers transcribed onto a notepad behind the muzzle.
Much less to get lost in the interpretation of what it all means. Actually, it eliminates any interpretation being needed at all.

 

[spife7980]

Test 46-46.5 in .1 increments and see how it really shoots if you want to know.