James,
These loads with the 160 gr Accubonds?
That powder charge is a great starting load for anything from the 160s up to the 200 gr ULDs.
Make sure there is some slight resistance when you close the bolt, you want this to control any case stretching. Not much but you want to feel it when the bolt closes.
Don;t look for the ususal pressure signs, you will not see them in the Lapua case. Such as loosening primer pockets and such. YOu will get some sticky extraction as your pressures top out for the cartridges design.
Take your time. It may seem like you are getting no where fast but once that 872 starts reaching proper chamber pressures you will get velocity jumps pretty quick.
3600 fps may be a bit optomistic with a 160 gr class bullet but you should easily top 3500 fps with your barrel and the 1-9 twist.
GO slow, watch for any sticky extractions or increased bolt lift.
Let us know where the 1-9 tops out at and how she shoots!!!
Remember the barrel break in, critical on this big 7mm. Take your time and do more then you actually need. It will pay off in the end!!
Kirby Allen(50)
