Been away hunting, too. Nothing to follow up with yet! To comment again on bullet stability, I realize the calculated risk of opting for a 1:9. With all things considered, I'll suffer the slight decrease in calculated b.c. value due to 'marginal' stability. Trade off being, insuring bullet integrity and terminal performance... Surely, an 'optimal' stability factor would be nice. However, if a faster twist rate required to achieve it results in the bullet literally blowing up in mid-air, or 'splashing' upon impact, then what's the point? This project will all have been a waste of time, effort & expense. If anyone knows of a high b.c. .224 caliber bullet that will survive ~350,000 rpm thru upwards of 1,000 rds of barrel life, then I'm all ears! Short of a monolithic, I'm just not seeing any? I've already done some homework regarding monster .224 cartirdges with 1:8 barrels blowing up bullets at 'x,xxx' fps. And given that my .220 Redline will have quite a bit more horsepower than anything previously researched, going 1:9 seems to be the only way for my bullet(s) of choice to survive the trip to target. My 1:9 Redline is either gonna work, or it ain't. When the time comes, seeing round holes in paper will be all the data points I need! Then, we can let the fur fly and have some fun!