Gentleman,I am finally going to purchase a .223 varmint long range rifle. I want a tack driver,but need to know a few things. Such as twist rate recommendations for .223 with bullet weight. Length of barrel is another option. Savage Model 12 F/TR looks like a perfect rifle,but very heavy. Your thoughts please and thank you for taking the time to answer my questions. This rifle will be used for long range shooting at coyote's etc,,,,,,,,,,