HSR22 Posted February 20, 2022 Report Share Posted February 20, 2022 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? Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted February 20, 2022 Report Share Posted February 20, 2022 Is one a soft point and the other FMJ? Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted February 20, 2022 Report Share Posted February 20, 2022 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. Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted February 20, 2022 Report Share Posted February 20, 2022 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". Quote Link to comment Share on other sites More sharing options...
HSR22 Posted February 21, 2022 Author Report Share Posted February 21, 2022 Both rounds are FMJ Quote Link to comment Share on other sites More sharing options...
HSR22 Posted February 21, 2022 Author Report Share Posted February 21, 2022 These are the bullets. Left Freedom 147 gr right Norma 150 gr. Here's the powder. Again the Norma is on the right. Quote Link to comment Share on other sites More sharing options...
Cunuckgaucho Posted February 21, 2022 Report Share Posted February 21, 2022 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. Quote Link to comment Share on other sites More sharing options...
HSR22 Posted February 21, 2022 Author Report Share Posted February 21, 2022 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. Quote Link to comment Share on other sites More sharing options...
Lane Posted February 21, 2022 Report Share Posted February 21, 2022 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. Quote Link to comment Share on other sites More sharing options...
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