F T/R Competition Load testing with sound mod fitted

[308PRECISION]

Hi there I would like some help
Q1. Iam looking to work up a load for my 308 with varget and burger 155g hybrids but I can't get time on a range but I can get about 300y on ground I shoot on I need to have a sound mod on the rifle would the mod effaced my data when I shoot on the range without the mod

Q2. What loads of varget should I start with.
Lapua Palma brass
Burger 155g hybrids
Varget powder
Federal Mach primer
Rifle barrel 24" 1:12

I shoot mostly 300y, 500y and 600y

 

[95LTZ]

I ended up with a very accurate load which was 46.4 grs. of Varget. This worked will in my rifle. Please start a little lower & work up. With a 25.5" bbl. the 20 shot string averaged 2889 fps.