au_prospector
Member
Guys I have a question regarding 9mm OAL and accuracy effects.
When I measure factory loads on 124gr RN I am getting OAL lengths of 1.15 or even a little longer. Federal American Eagle is 1.153 and Winchester NATO is 1.156.
I just loaded up a batch of Xtreme 124 RN and seated them to 1.15 and some are as long as 1.153. They "plunk" fine. I have tried 3 different powders and am not getting even "factory accuracy". I have used Unique, CSB-1, and 800-X. I fixed an overcrimping issue and now barely crimp at all with no deformation to the bullet. Still, accuracy is suffering.
My question is I am using powder data which states to seat them in the 1.11 to 1.13 inch range. Dont I want the bullet closer to the lands? Also I am using the same amount of powder the recipes call for with shorter OAL, should I bump it up a bit?
IMR load data says 1.125
Lyman does not list a 124 gr FMJ, but most all the 9 mm data is even shorter.
Alliant states 1.12
When I measure factory loads on 124gr RN I am getting OAL lengths of 1.15 or even a little longer. Federal American Eagle is 1.153 and Winchester NATO is 1.156.
I just loaded up a batch of Xtreme 124 RN and seated them to 1.15 and some are as long as 1.153. They "plunk" fine. I have tried 3 different powders and am not getting even "factory accuracy". I have used Unique, CSB-1, and 800-X. I fixed an overcrimping issue and now barely crimp at all with no deformation to the bullet. Still, accuracy is suffering.
My question is I am using powder data which states to seat them in the 1.11 to 1.13 inch range. Dont I want the bullet closer to the lands? Also I am using the same amount of powder the recipes call for with shorter OAL, should I bump it up a bit?
IMR load data says 1.125
Lyman does not list a 124 gr FMJ, but most all the 9 mm data is even shorter.
Alliant states 1.12