Mine is a 1-10 and it is best with 168 grain and less bullets, no problem as heavier than this I shoot in a 1-9 twist 7RM. If I get a new barrel I will go to 1-8 or even 1-7.5 0r 7.7 to shoot the 180+ bullets as now there are a few 200 grain bullets available. But I feel no need to turn my 7mms into a 300 mag and mostly bullets over 180 grain will go in 30 caliber rifles.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli