I have a Kimber 84M Varmint chambered in 204 Ruger; the rifle is not very accurate. I have found that the rifle has 0.187" of freebore when the bullets are seated to the maximum lenght that the magazine will allow. I am considering having the breech end shortened and then have barrel rechambered as a 20 Tactical. How much will the barrel need to be shortened to get rid of the freebore? Does anyone else have the same problem? Have any other solutions/suggestions? Thanks for the help.