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Hey Brian how long was your Barrel?northernchris, If it is genuinely a 1 in 14 twist barrel then it has no chance of stabilising in your 22/250.
About 20 years ago, when the Hornady 68 grain HPBT, and Sierra 69 grain HPBT became available in Oz, I built up a .220 Swift AI. I took my gunsmith's advice, and chose a 1 in 12 twist barrel, but despite reaching 3,700 fps, every projectile keyholed into the 100 yard target.
So a 69 grain Sierra at about 3,250 fps out of a 22/250 with a 1 in 14 twist barrel has no chance whatsoever.
I have used the 69 grain Sierra extensively in my 22/250AI with a 1 in 10 twist barrel, and at velocities ranging from about 2,800 fps through to 3,450 fps, there has not been a hint of a keyhole, and accuracy has usually been 0.5moa or better. Hope that is of some help. Brian.
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How does it profit a man if he gains the whole world but loses his soul?