Hey I jumped to the end and just want to SIMPIFY any ones reloading.

You have to work up loads to find the max safe pressure in any gun. And as you do you will see which load actual produces the best accuracy. And if you do this at the max over all cartridge length that your gun allows and that may be 0.010" off the lands or what your Magazine length allows. Now you can shorten that OCL to see if you can get still yet better groups.

Itis that simple! Yes its just that simply!

In the case of a tube magazine you will have to crimp at the cannelure and yet contend with the listed max OCL that and that first best load will be about it. Next is to try a different powder.