Is that a newer Tikka with the 1:8" barrel from the factory?
Updated twist rates have bought it back into contention for the handloader as one of the most versatile chamberings around.
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Yip 243 my main caliber took a backseat to the remmag for a few years but upgraded the scope to dial up and bush hunting more over the dog so have been using it a lot now.
I have a howa 243 and shoot factory winchester deer season xp. which seems unreliable to me. I have had good results but also had it blow up on a fallow front shoulder and didn't penetrate very far. Other times it the deer ran maybe 20m and dies.
I like it though, easy to shoot/low recoil and seems effective for realistic hunting ranges.
I have seen photos of federal blue box on deer and it's lethal so might try that next.
I can't see it listed here
https://www.hornady.com/bullets/rifle/#!/
I believe it was something to do with the fact that the cx copper mono's fill the same niche and were by Hornandy's standards a "better bullet" (higher bc easier to manufacture etc) I seem to recall something along those lines being mentioned in one of the podcasts above cx bullets.
Could be wrong but that's my vague recollection.
Sierra 85gr hpbt is an absolute weapon in the 243 .
Old technology that just works .