| Grenadier |
| (.375 member) |
| 26/08/17 09:04 AM |
|
Re: Behind-the-bullet- 6.5-284-Norma
|
You did it again.
You said,
Quote:One could have said with just as much validity,
MY point was/is thats an unfair comparison as in that you are attempting to stack the longer heavier bullet in the 270's column to match the bc of the 6.5..IF BOTH the 6.5 and 270 are 140 gr bullets the 6.5 wins every time...in both bc and sd, period..
Other point is the fact the lighter bullet will in fact have a higher mv..and with the already good bc/sd of a 6.5, the 270 in the higher weight would never make up the difference at its reduced mv.
Quote:
That's an unfair comparison as in that you are attempting to stack the longer heavier bullet in the 6.5's column to match the bc of the 6mm's . IF BOTH the 6mm and 6.5 are 120 gr bullets the 6mm wins every time...in both bc and sd, period..
Other point is the fact the lighter bullet will in fact have a higher mv..and with the already good bc/sd of a 6mm , the 6.5's in the higher weight would never make up the difference at its reduced mv.
A 162gr .277 bullet made to the same form as the 147gr 6.5mm ELDŽ Match bullet would have the same BC but could be driven at higher velocities than the 6.5 version. Further, a 165gr .277 bullet made to the same form as the 147gr 6.5 ELDŽ Match bullet could be driven just as fast as the 6.5 version but would have a BC of .710 (G1)!
There should be little doubt that a 270 Creedmoor would give the 6.5 Creedmoor a run for its money or that a 270-284-Norma would do the same to the 6.5-284-Norma.
But alas, there are no such .277 caliber bullets available. So, the 6.5 Creedmoor and 6.5-284-Norma are in the forefront and in the limelight. Not because the 6.5mm bullet is magical, but because there are no good .277 caliber bullets to compete against them. Not to say the 6.5s are not fantastic cartridges on their own merit. They absolutely are.
And as for a .257 Creedmoor, with proper bullets it would lie in performance right between the 6mm Creedmoor and the 6.5mm Creedmoor. Wouldn't that be nice.