Hornady V-MAX® bullets consistently achieve accuracy and rapid fragmentation at all practical varmint shooting velocities. At Hornady,® we manufacture Custom™ ammunition to give shooters and hunters the advantage of handloaded accuracy in a factory load. If the bullets have cannelures, just seat them where the case mouth is centered on the cannelure.Even though they were HOT, no burs sticking up on brass, just minor 'swipes'. The significant difference will be the seating depth (cartridge overall length). Powder drop wise, I would go with 26.5 gr of Varget with any of the 55 gr bullets. Sorry, I don't have any experience with Xtreme bullets. don't believe the factory ammo specs when you shoot from a short barrel. about 3100 fps from a 20" AR-15 barrel, however a 16" barrel will only clock at about 2800 fps.
223 Rem 55gr bullets are rated at 3240 fps from a 24" barrel. Yes, chronographs are great tools but you really need to do some research to find out what your 16" barrel will do. 16" barrels do much better than M4s and are typically quite accurate out to 100 yards. except the real M4s have a 10" barrel which isn't legal (16" minimum). These newer 16" barrel ARs are mostly a clone of the military M4. I don't see that as an issue with your S&W MP because the short barrel just isn't well suited for distances much longer than 100 yards. Rojasj, The military and NATO use 62gr bullets because they are more aerodynamic (higher ballistic coefficient) and will maintain stability much farther downrange than 55gr bullets in a standard 20" barrel. a whopping 440 fps loss, which is the prime reason why downrange accuracy suffers. Factory 55gr ammo chronos very close to 3240 fps whereas the same ammo in my 16" AR556 clocks at 2800 fps. I chronographed many different loads in my Remington 700 (223 Rem) with a 24" barrel. Yes, you can shoot at longer distances but don't expect stellar accuracy. With the M&P's and Ruger's short 16" barrels, it makes the optimum shooting distance about 100 yards or closer.
I have a Ruger AR556 (1:8 twist rate) and found 55gr were slightly more accurate than 62gr at 100 yards. Your 1:9 twist rate will support heavier bullets but you will find inexpensive 55 grainers do an excellent job. I'm sure a similar load with CFE would produce the same results. Hornady V-Max or Nosler Ballistic tip 55gr bullets are my "bench mark" loads. I found with Varget and with virtually any 55gr bullet, 26.5gr does a good job and has been very accurate in the many rifles I have tested it in. In rifles, typically the best accuracy will be found when the cartridge is loaded to emulate factory ammo velocity. Rojasj, There's nothing magic in any powder.
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