Honestly all I have to go on is the rifles history and accuracy. I've had the rifle since I purchased it new over 30 years ago, and I had it skeletonized brand new. Since then it's been a 7mm STW , until gross overloads of retumbo burned out the barrel, then a 375 WBY for near 1000 rounds (24" fluted barrel no break, actually lost a tooth to that setup), then a 340 WBY, a 28 Nosler, and now a 300 PRC. Every caliber except the 375 WBY produced 1/2 or a little better groups. The 375 would do 1/4" with 300 grain Barnes x bullets, and put 2 x's and a sledgehammer solid into a shade of 1/2". The action has always been professionally bedded in a high quality stock, I'm guessing that helps. High quality barrels installed by a really good smith too. My long winded way of saying I just don't know if the action flexes or not, but it's been super accurate and reliable for over half my life. I trust it and it's done a hell of a lot good work for me.