I do love it when the first point made in an argument is an insult. Well played sir, do you believe that this approach makes your point even more believable?
You said it yourself. " In 39 years of .243 shooting and reloading, I’ve never come across a 10 twist rifle that won’t shoot a 100gr flat base softpoint such as the ProHunter or the Hornady spire point (that Hornady has discontinued now I think).". Then you start to reel off reasons why, folk use the wrong bullet and that it causes problems etc. Whatever, stick any bullet you like in a 6.5 calibre and you're sorted. That Fiesta can still do 100mph, what's your point and how does that make what I say nonsense? If you read what I said again and compare it to what you said, you actually agree with some of the things I said but are angry about it? I never said it couldn't kill deer, I said it struggles with 100gr bullets and you backed that point straigh up with your "In 39 years of .243 shooting and reloading, I’ve never come across a 10 twist rifle that won’t shoot a 100gr flat base softpoint such as the ProHunter or the Hornady spire point (that Hornady has discontinued now I think) ". Why can't it shoot a boat tail or monolithic? Because it's marginal.
Well mine shoots boat tails without any issues, have heard all the tales of 1in 10 twist .243s not handling 100 gr
bullets and I don't doubt there may be some truth in it ,I have never encountered one and I have experience of
more than a few.
Not near as common as some would have you believe.

