not picking a fight but i don't get the springy action idea. seems to handle the 284 winchester, 375 winchester , 308 winchester without noticeable movement of the shoulder on the bottlenecks , or lengthening of the 375.
the 284 and the 308 aren't exactly low power cartridges.

the consolidation of the states into one vast republic, sure to be aggressive abroad and despotic at home, will be the certain precursor of that ruin which has overwhelmed all those that have preceded. Robert E Lee
~Molɔ̀ːn Labé Skýla~