I have fired at least a dozen 300 Win Mag through a dozen different 300 Weatherbys with no separation, not even a hint of a separation. Not much neck on the case though! Of course, it is common practice to shoot 300H&H in a Weatherby, in order to get brass which is tougher than the factory offering. Many have necked down 338 brass and used it in a 308 Norma. There is clearance ahead of the belt on the OP's rifle.
Case separation on first firing
- Thread starter propliner
- Start date
I have fired at least a dozen 300 Win Mag through a dozen different 300 Weatherbys with no separation, not even a hint of a separation. Not much neck on the case though! Of course, it is common practice to shoot 300H&H in a Weatherby, in order to get brass which is tougher than the factory offering. Many have necked down 338 brass and used it in a 308 Norma. There is clearance ahead of the belt on the OP's rifle.
Jonnyofalltrades
Regular
- Location
- North-central Saskatchewan
So how do you propose that .300 H&H was converted to all the blown out wildcats of the 50's? They would routinely move the shoulder forward huge distances.
The belt was holding the case head tight against the breech face, so no stretching, and no separation.
Jonnyofalltrades
Regular
- Location
- North-central Saskatchewan
I certainly am not trying to be argumentative here, but I didn't say that I thought .050" was fine.
Also, SAAMI tolerance for 6.5-300Wtby from shortest allowable case to longest allowable chamber is .0176"
If I wasn't completely incompetent at posting photos I would attach a screenshot of the drawings.
Rousing discussion....
Yep, this is what it's all about. With the case head held on the bolt face, the case body is free to expand into the chamber and does not stretch.
The shoulder datum is +.010”/-.00”. There’s quite a difference between blowing out shoulder dimensions, and stretching the body of case to failure. There’s a difference in the process, and the result. When blowing our shoulders, you need to support the case somehow at the mouth end, either with a false shoulder, or by jamming a bullet into the lands, so that ICS doesn’t happen.
Definitely not by simply firing factory ammo in the wrong chamber.
Jonnyofalltrades
Regular
- Location
- North-central Saskatchewan
Tokay444;19858389 When blowing our shoulders said:
Jonnyofalltrades
Regular
- Location
- North-central Saskatchewan
P.O. Ackley's Handbooks have lots of good information about this. Don't take me word for it.
I've used most of those. As in my original statement, "if it moves enough". Brass will only stretch so far. - dan
At the front end, it will stretch a lot with no ill effects. Even near the head new brass can expand a lot. Lengthwise stretch is another matter and separations occur because the stretch is concentrated in a small area. This a result of where the case is gripping the chamber and the thickness of the brass at that point.
Jonnyofalltrades
Regular
- Location
- North-central Saskatchewan
Direct quote from page 157 of Ackley's Handbook for Shooters and Reloaders. "With rimmed or belted cases the shoulder can sometimes be moved ahead as much as 1/8" without rupturing the brass."
By rupturing he is not referring to case head separation.
Again, "if it moves enough", it will split. An eighth of an inch is only 0.125". - dan
Good idea. - dan
The problem with a headspace gauge in a belted magnum is that it only tells you if the belt recess in the chamber is within spec. A chamber cast will likely give you more useful info in this case. - dan
Except if the headspace is within spec (meaning you can not close on a no go gauge) the brass will simply blow out to the existing chamber with no case separation... it's not driving ahead if the headspace is correct... I still think there is something wrong with the brass... but eventually we will know...
The chamber and rim are all part of the reamer. It is impossible for the chamber to be excessively long if the headspace is correct. With the exception that the reamer was wrong in some way.
Who has the materials to cast a chamber on hand? Its a nice suggestion, but one that is totally impractical for the average guy.
