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300 wsm sizing problem

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Old 04-03-2002, 12:09 AM
Platinum Member
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: 300 wsm sizing problem

is the crown off center from the barrel OD. or ID? If it is off center in relation to the ID. it can be corrected easily but how it could be off is the question there. The bore could be off center too. My gunsmith said almost every factory chamber is cut way off some so far off you'd swear the reamer was going to break when they're being opened up larger. A definite plus in getting rechambered to something else.
Brent Moffitt
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Old 04-03-2002, 01:30 AM
Junior Member
Join Date: Mar 2002
Location: missoula,mt.
Posts: 7
Re: 300 wsm sizing problem

im not sure how to tell what it is centered to but looking straight at it looks like the reamer was atleast 5 degrees crooked.i first had it installed on a factory 338wm.then had it rebarelled with a douglas and wanted the break back on it.he assured me it was fine so thats why i had it put on again.i did notice when he first put it on the stock barrel my impact point moved almost a foot.thats when i stated looking closly and asked him about it.there is a tube inside the break that is @.04" larger than the bore and the gases are vented out the break as the bullet passes into the tube.but i don't know why he would put a crown in at all if he says there is not enough gases at the end anyway.the gun shoots -1" at a 100 with carefull reloading(250mk), but was hoping for better.
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Old 04-03-2002, 03:14 AM
Platinum Member
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: 300 wsm sizing problem

From what I understand, the pilot for the cutter must have been bent. Impact would most definetly be off too. It must be cut square and crowned square, for any accuracy to result. I would find a new smith if he tells you anything differant. I had a smith thread a barrel for a muzzle brake on a 378wby Ruger #1, it was paralell but off center and bullets struck the brake. His fix was to open the ID. of the brake. This opened my eyes to his aptitude and cost him my buisiness.

Have it redone is what I would do, or do it yourself.
Brent Moffitt
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