Thread: How to get fast twist barrels in NZ

Originally Posted by Wingman

Personally I think if I was to build another subsonic rifle Id lean toward one of @Kiwi Gregs 8.6x47 Lapua's.
Much better brass and the flexibility to load viable high velocity lighter bullet loads for longer shots if needed.
Not sure if the 1-8" .338 Shilen barrels are still available but that would be my first choice, or a 1-9" true flight would be fine in that.
Do you have the chamber reamer for that one Greg or was it just a 6.5x47 lap followed up with a .338 N&T reamer?
I considered a 6mm Norma Dasher necked to .338 with its slightly longer brass and 40 deg shoulder compared to the shorter the 6BR with the 30deg but I think this 8.6x47 Lap will make the most of a short action and multi purpose loadings.

When we made my 338 BRX AR15 upper we cocked up & used 338 Whisper reamer which meant the throat was too long for the projectiles I wanted to run & they were crap

The 160 TTSX on the other hand went fantastic, 1/2 to 3/4 moa was easily achievable at 25-2600 fps with a 20" barrel, it was an awesome upper on a 1-9 True-Flite barrel

I wanted more case capacity for its replacement only having a 11.75" barrel to get 2600 fps & still easily keep it in a magazine.

We used a 6.5 x 47 Lapua & 338 Federal reamer to make the chamber