This is my first post on the site and I have learned alot from reading everyones posts on subjects that I needed info on. So here is something I'm having trouble figuring it out. I'm getting back into long range shooting I have been shooting a 338 win mag ever since I was 12, my longest shot was at 1078 yards on a glass 1 liter bottle. I have recently bought a savage 110fcp 338 lapua with the HS stock. I have mounted a vortex pst 4-16. I have been shooting berger 300 otm's over retumbo. (90-93grains) adjusted OAL from on the lands (3.850) to being able to fit in the magisine (3.765). The best I can get is for groups at 100 is about .7-1. moa. My question is I have read some places that this caliber can shoot tighter groups at 200-300 then it can at 100. From what I have read this is due to the bullets not fully being stablised at 100 and they "settle" in to their flight path. I'm just wondering how true this statement/myth is? I'm just getting a bit discouraged only because this is the best I can get out of the rifle. My other rifles give me this accuracy or much better but getting out to beyond 100 I have to get out to places other then my range. The rifle now has about 100 rounds through it now should the barrel be broken on more to acheive better results? My other concern is resting the stock while shooting I have shot it both off a granite rest (cast iron with a pad) and off the bipod. Resting the buttstock on either my hand or a sand bag gives worse results then if just shouldered off the bipod (hopefully I'm explaining this correctly) What are you all using for media/ material in your gun rest bags? ie are they soft/ hard. loose/tight etc. I'm just trying to find answers from folks that know more about this subject then I do. Thanks for any info.