|Originally Posted By borderpatrol:
Originally Posted By sititunga:
Originally Posted By borderpatrol:
2750 fps is about it for speed with 107's. You don'yt have to run them that fast to get good groups. The 107 6mm match bullets are some of the very best bullets made. They lack nothing in the accuracy department.
The Grendel gets that speed with a 108 grain bullet, furthermore the 6mm Turbo 40 Improved gets 2850 - 2900 with that weight bullet.
My Grendel is over 100 fps slower, closer to 150 fps slower and the bolt has less case support at the head. My Grendel's barrel is 2" shorter which has a effect on speed also. The 107 6mm SMK has a B.C. of over .500, the 107 6.5mm SMK is only around .400 B.C.
The OP was intereste in what 6mmWOA does, not in a caliber vs. caliber debate.
The advantage, in my opinion, lies with Whitely's wildcats just because the quality of the brass is better. Lapua is the premier maker of brass, although they do a better job with their PPC and BR brass than some others, Grendel included. The shotcoming has already been mentioned, weaker bolts because of less metal.
Grendel shooters have their "proud member of the broken bolt club" which I'll try very hard not to join.
edited to add - Grendel uses a nominal 7.62X39mm case head bolt .441" to .444" +/- a little. AR Performance and others are producing .308 case head bolts and extensions which will allow 6mm Norma BR based cartridges to run through an AR chassis. Magazines may be the only glitch to be worked out.
also added - I would like to see AR Performance give us a .441" to .444" face bolt based on their new .308 bolt. This will give the Whitely Grendel based wildcats a better home to live in.
The 6.5 108 Lapua has a BC of 478 which is pretty close to the BC offered by the 6mm 107gr SMK. I chronographed some 6.5 108 grain Lapuas out of my Grendel the other day and was achieving 2740 fps from a 22 inch barrel. AR15 Performance's bolt would certainly handle the Grendel or Whitely's wildcats with more pressure comfort room. Harrison at AR15 Performance has already indicated he could offer bolts for the Grendel. However I do think the 6mm BRX is the cartridge to watch in the AR15 platform.