Originally Posted by RangerEd
Thanks everyone for all the good information!
Now this leads me to a few more questions (so bare with me please).
1) Whats the deal with the belted cartridge? Is it a one piece or a two piece? Im assuming its there to strengthen the case?
2) Which cartridge has more capacity? The WSM or Win mag?
3) If the Win Mag has the increased capacity case, why do the two compare so equally? Dose the WSM use hotter powder?
JohnnyK makes it perfectly clear. Great write up!
Ok so headspace on more and more modern cartriges is based off the shoulder. People finally figured out the ''belted magnum'' was completely un nescissary for cartriges with decent shoulders.
As JohnnyK pointed out most modern cartriges have a shoulder and are not a ''straitwall''. Having a belt on a shouldered case just means its more finnicky to size, and you have a place where when and if casehead seperation occurs the ''weak spot'' just ahead of the belt will usually be the first place to fail.
I headspace off the shoulder for my 270wsm(non belted case), and my rounds fit my chamber so I get a slight crush fit when I close the bolt. My 300wby(belted) however is a pain in the butt in comparison because the head space is done off the belt so sizing to chamber becomes a bit more involved to get it right. Once youve got it, youve got it tho.
The reason the two 300's are compared so closley, simply has to do with case design. A short fat column of powder(wsm) with a steep shoulder burns more efficiently giving more power per grain of powder used than a longer tapered case.
The main difference comes in when shooting heavy bullets. The bullets cant get any bigger around, so to get more wt, you need to shoot a longer bullet. There comes a point on the wsm where the bullet sets down too far into the case to be efficient, and starts causing excessive pressure. You typically dont have this issue with the bigger Win Mag case.
Questions 1, and 2, Both are 1 piece cartriges (as are all cartriges), and no the ''belt'' doesnt add any strength. Its simply there for headspace. Wich IMO is a waste of time on a well shouldered case. Its simply one more un-nescissary speed bump in the proscess. But I do love a 300mag in just about any case configuration.
Great performers, and all-round caliber.
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