Back in March I was reloading for my new .223 Wylde upper with Hornady's 68 grain HPBT item # 2278C. This was a bulk purchase of their 68 grain bullet with cannelure. All mine measured 0.920" or so, but I kept on coming across literature that said they should be 0.980" or so.
So I emailed Hornady Support, and they said:
Robert the COL of the bullet is 0.917 +/- of 0.005. Thanks
I never asked about their non cannelured versions Item# 2278, 22785 & 2278B
A few days ago on TOS I saw a measurement of a 68 grain HPBT Item#2278 that measured 0.982", so I e-mail Hornady Support again:
Thank you for the email. The over all length of the bullets are different. The 2278B is 0.986" + or - .005 and the 2278C is 0.917" + or - .005
So anyone wondering why these bullets shoot so badly in some 1-9" twist barrels and better in other 1-9" twist barrels, is the fact that the cannelured one is stable (shorter) where the non-cannelured one is at best marginally stable (longer).
I use a 1-8 twist barrel, but I still find this a bit bazaar, that two bullets of the same weight from the same maker could be so different. Hornady tells reloaders nothing about this difference unless they ask.....
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