I must say that I have not read the measurements of your rifle. have you slugged it and measured the cases yet? these measurements will tell volumes for the needed information that everybody is trying to help with. no need to do a chamber cast ...[altho this IS the best method to a very accurate measurement]... with the simple method of just pounding a pure lead slug down the greased barrel from the muzzle ... and then just measure the grooves and bore diameter ... then simply ,,, slightly bell the unsized case mouth so an accurate measurement of the mouth/neck area will be a simple measurement of the chamber needs of the throat/chamber end of your rifle.