I have the opportunity to buy a nice Shiloh Sharps .40/65 Rifle but the barrel definitely needs to be replaced. About how much does Shiloh charge to put on a replacement barrel ?. I have heard they use "Green Mountain" barrels, is that true ?. I have found that Shiloh's take a special bullet with reduced bands and that best results are using Shiloh dies. I am thinking of trying to get standard chambering.