The .243 with R26 and 105s is getting some pretty impressive speeds well into what used to be AI and .244 territory.
Shoot it out as is and then decide when it is ready for a new barrel.
Don't know about the Norma Dasher brass but I think it would be worth it to form with Lapua as it will last as long as anything available. The only other I have used that was comparable is RWS but it is hard to find and expensive when you do.
I get up to 30% more loads with Lapua so it helps justify the cost.
"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
| 
