I had the same experience with my 280 Bigcountry, after last year I vowed to find a tougher bullet for that rifle. The scirocco bullets were among the ones I tried, but like you, about 2" groups was the best I could get it to do. I also tried failsafe, two weights of speer grand slams, nosler partitions,barnes x and all the 160 grain bullets of regular construction. That rifle was pissing me off! It would shoot 150 grain ballistic tips into little biddy groups and everything else into patterns. I shot it in the walnut stock and also in a brown precision synthetic bedded free floated and with forearm contact in both. After all that I noticed that it shot slightly better with forearm contact and I went back and put about 8 lbs of upward pressure in the forearm bedding. Eureka! Now it will shoot sub moa with 140 gr barnes x bullets over 57 gr of AA 3100 or with 54 gr of reloader 22. I have been shooting a group or two every now and then all summer and have now shot about 50 shots with that load and its still averaging just under moa. The scirocco bullets still wont shoot well in it though. All this bs took me six months and cost about 400$ for bullets, but at least now I have the load I want. I cant imagine that you will have any trouble with the 180 gr bullets though, they should have plenty of mass to get on into the boiler room of even a large mule deer. Thats the good thing about ballistic tips, they are about the most accurate bullet available in alot of calibers and weights. I just wish they would stick together a little better. When barnes first came out with the x bullets, I had three rifles that would shoot them as good as anything Ive ever had, then about 1994 they redisigned the x and those same rifles would shoot consistent 4 to 5" groups. Barnes has since started making the x again without the secant ogive and I am getting usable accuracy again with the 7mm 140 gr and the .338 185 gr. My .338/06 will still shoot ballistic tips better than anything though, several times I have shot five shot groups with it in the 1/2" range. It will average about .9 inches with them. But the x bullet is the most consistent performer and the damnest killer I have ever seen. Well, I didnt mean to write a book here, just on my lunch break and this is something that I like to talk about.