seating depth vs amount of powder

[jmh240]

I'm looking for some advice on how to work up a load for my 6mm BR. What should I vary first seating depth or the amount of powder? I've been picking a starting seating depth, say .015 into the lands and then varying the amount of powder. When I find what groups the best I start varying the seating depth to improve it further. Is this correct? If not what is the correct method. Also, what is a good starting seating depth for 90gr Berger's?

Thanks,
Jim

 

[Travelor]

I believe you are doing the correct thing. Powder first, seating depth second. Then try different primers.

 

[Posit]

Personally, I first select the bullet I want, work on powder,type and quantity) until I find a recipe which groups well, then check the affect of different primers. Finally I tweak seating depth. If I can't get the accuracy I want at any step, I pick another bullet and start over.

Seating depth for the 90g Berger will be dictated by your starting point of .015 off the lands... you seat the bullet to the depth required to give you the .015.