Since Barnes makes both a 165 grain and a 168 grain version of their .308 TTSX I was curious what is the difference in them. I sent an email to Barnes with my question and here's the reply I got.
I'm sure plenty of guys on here have used the 168 TTSX in their magnums though.
Hi John,
Great question! The 165gr versions incorporate a short nose profile, often referred to as the ogive, to accommodate cartridges that require a short COAL (Cartridge Over All Length) requirement, such as the 300 Win Mag and 300 WSM. The 168gr TTSX has a longer ogive than the 165gr TTSX and it provides a more efficient, more streamlined design that allows it to retain its velocity and energy better. We test each bullet and assign it a value that rates each bullets ability to overcome air.This is referred to as the BC or Ballistic Coefficient. The higher the BC value the more efficient it is. So you’ll see a slight downrange advantage to the 168gr versions with their higher BC’s when they are incorporated in cartridges such as the 30-06, 308 Winchester or 300 RUM that can accommodate the a longer finished cartridge length and magazine requirements.
The 165gr TTSX requires a minimum impact velocity of 1800fps for bullet expansion and the 168gr TTSX only requires 1500fps.
Thanks, Ty
Ty Herring | Consumer Service
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Use the data and advice at your own risk, and with extreme caution.
IMPORTANT NOTE: Always begin loading from the minimum "START” charge and carefully develop loads by increasing in small increments of 2% towards the Maximum load.
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38 North Frontage Road, PO Box 620, Mona, UT 84645
Phone 800-574-9200 | Fax 435-856-1040
