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Deleted member 46119
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I have or have had 8, 9, 10, 12 and 14.I have 8, 9, 10 and 12. wanna shoot against a 10 or a 12 twist ? they really shoot good. the 10's are sako barrels, the 12 i s a hart. barrel quality is important.
My results are different from yours as far as hunting rifles with factory barrels go. Quality is hit or miss....
Factory barrels are generally ~10. The Sako L579 Mannlicher was cool but took a bit of development because of the Mannlicher stock. The Winchester M70 1959 shot flat base bullets really well. Copper took some work. The Vanguard original 243 barrel never shot worth a penny, it became a 260. FWIW Savage .243s are 9.25 and I don't have one.
I get more flexibility with 8tx for 6mm and 6.5mm or course I live in Copperfornia so faster is better for me. So far these are all custom barrels. Customs are of course higher quality but don't come on factory rifles so your argument is not very supportive of the OPs purchasing options.
The ARPerformance 9tw barrel has a V-Max load that is sub moa, now I have to work out the copper load.
The 12 is gone. Never got it to shoot.
The 14 is a BR rifle for ~65gn flat base short range. Only 20 rounds down the tube but a Hart bench rest barrel will shoot no question, if I do my part. I am refinishing the stock. It got painted cammo over a beautiful flame gel coat color scheme...