Length difference

[HSR22]

Could some explain. I have two different .308 rounds. 1st is Freedom Munitions 147 gr. and the other is Norma 150 gr. When standing next to each other you can plainly see the Norma round with a heavier bullet is much shorter than Freedom Munition round. The cases measure the same, so why is the Norma bullet set so much deeper?

[Armed Eye Doc]

Is one a soft point and the other FMJ?

[jtallen83]

Could be the metal they are made of, a true copper jacket/lead core bullet it more dense than the gilded mild steel projectiles. Check with a magnet maybe.

[Armed Eye Doc]

A quick search of those rounds shows that the Freedom Munitions may be FMJ and the Norma may be a soft point .  I measured a soft point vs. FMJ.  The soft point was 2.755" and the FMJ was 2.890".

[HSR22]

Both rounds are FMJ

[HSR22]

These are the bullets. Left Freedom 147 gr right Norma 150 gr.

Here's the powder. Again the Norma is on the right.

[Cunuckgaucho]

 

To get a true reading of a bullet length the common way is to measure from the bullet's ogive. So were are the bullet ogive in relation to the base?

 You'll also notice the powder grains are different one is fine/ball like vs extruded

Everything in front of the ogive doesn't touch the rifling while everything below( until the boat tail begins) does touch the rifling( bearing surface. When comparing bullet shapes there are a number of variables . For example the Winchester has a BC= 0.398 and the Norma has a BC= 0.41

 At the end of the day if you don't reload, shoot both and see which one your gun like best.

[HSR22]

I'm not well versed on the topic bullet construction. Why do you suppose that 150 gr bullet is shorter than the 147 gr bullet. Also I ignited both gunpowders and noticed the extruded powder burned much faster.

[Lane]

1 hour ago, Cunuckgaucho said:

Winchester has a BC= 0.398 and the Norma has a BC= 0.41

 

55 minutes ago, HSR22 said:

Why do you suppose that 150 gr bullet is shorter than the 147 gr bullet.

Different shapes.