you can make the same rifle with your Hawken and order a Green Mountain drop in barrel with shorter length and faster twist for the conicals and the cost is about $160.

Also

MLKeith... an excellent idea. They make a short 21" .50 caliber with a 1:28 twist for that Hawkins of his.
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Need a link for this 21" GM barrel for the Hawkens. Can't find one anywhere. All I found is a 28" which still makes the rifle over 8.5 lbs... not what poster Oldguy wants. Thanks!