What does WSM or WIN OR SPRG mean in a caliber measurement?

Question

I'm going to buy my son in law a rifle and when I go to the caliber settings it says 300 WSM and 300 WIN, if its the same caliber then what's the difference? then on the bottom it becomes 7mm, is that the largest caliber for the gun? or is 7mm not a good choice? can some one give me the basics please?

Answer 1

Bound's hubby here:

The name or designation given to a cartridge identifies two pieces of critical information about the cartridge: the bore diameter of the projectile and the name of the cartridge. It is kinda like shopping for a suit: business versus leisure, wide lapel versus narrow lapel, or single breasted versus double breasted.

The number represents the diameter of the bullet. That is the easy part! Bullet diameters can be identified by decimal diameter (.22, .25, .27, .28, .30, .32, .33, .35, .40, etc.) or by the metric diameter (5.45mm, 6 mm, 7mm, 8mm, 9mm, 10mm, 11 mm, etc.). Sometimes, if the diameter is metric, it will suggest the cartridge is of European origin, but not always the case.

The name will indicate two things: the designer/originator of the cartridge, and whether the cartridge is a magnum or not. Each cartridge design is unique, and is intended to exploit the cases volume which can affect the powder burn rate. Generally, cartridges of the same bore diameter and different designer are not interchangeable ... to do so (if the cartridge fits the chamber of the rifle) could be courting disaster.

Generally, you want to select a rifle and cartridge adequate for the game you are hunting. You can use the game and cartridge selector (linked below) to help in your cartridge selection!

Good luck!

Answer 2

Wsm Calibers

Answer 3

A 300 WSM is a shorter version of the 300 Win Mag.
They both use a .308 diam. bullet.
7mm is a smaller diam. bullet. You can get faster velocities out of it.
WSM stands for Winchester Short Magnum,
If he is going to be a sniper and shooting people either gun will take there heads off. But I would buy the 300 WSM.

Answer 4

The alphabet salad behind the caliber is who designed the round. i.e. WIN is Winchester, WSM is Winchester Short Magnum, SPRG if Springfield A 7mm is basically a .280 caliber bullet. It will do for anything in north america as will the various .30 calibers (Which is larger). Found out what he wants to hunt/shoot and it will give you a better idea of choices. When in doubt the .30-06 springfield has about the biggest following as the "can do it all" round.

Answer 5

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The .300 RUM will with a 150 grn weight. The .338 bullets are to heavy with thicker jackets to open up prematurely or rupture on impact. The .325 WSM is built tough like the .338 bullets. Thick jackets and almost complete weight retention upon entrance and exit. The .30 cal bullets in 150 weights in most variations have thin jackets built for .308 and 06 velocities to intiate quick expansion. Not so good at the .300 mag velocties which act like a varmint grade style and almost complete disentigration upon impact. Therefore a larger wound and body organ blow-ups. The .300 and .338 are on par in power, both at 4300 ft lbs of energy. The .338 with the 250 grn Nosler Partition HE Federal preimium at 2800 fps and 4300 ft lbs and the .300 with the 200 grn weight at over 3000 fps. The .300 will hold energy levels well past what the .338 deliver's past 200 yds.

Answer 6

It looks like you have some answers, but I am selling my .300 Win mag., to buy a .300 WSM (Winchester Short Mag.). The ballistics on the wsm's is very impressive.

Answer 7

I am guessing it only refers to the brand of ammunition, whereas WIN stands for "Winchester", SPRG stands for "Springfield", and WSM stands for "Winchester Short Magnum"