Case Dimensions and Pressure ?'s

Earnhardt

Well-Known Member
LRH Team Member
Joined
Aug 25, 2012
Messages
421
Location
NW Minn
OK, Big time newbie question here.

When changing case dimensions and neck angle of a cartidge how drastically does that effect chamber pressures and velocity?
When using the same exact weight bullet and powder how much more velocity and chamber pressure will a .300 WSSM have than a .300 Win Mag
Or, let's say you have a straight walled cartridge like a .458 Win Mag. If you took that same weight bullet and same weight/type powder and turned the cartridge into a wildcat cartridge how much would that effect pressure and velocity?
A 5% increase in pressure and velocity?

How about the opposite. Take a 6mm PPC cartridge and use the same weight bullet and same weight/type powder in a straight walled case.
How much would the decrease pressure and velocity?
5%?

Or doesn't it effect velocity and chamber pressure that much by changing the dimensions of the powder case while using the same weight bullet and powder?

Thank you for your time.
 
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