barrel twist

[philpapa]

I went prarie dog hunting in Oklahoma and got addicted with one fix. I called Hart and he recommended a 6mm br with a 1 in 12 twist for 68 to 70 gr. bullets for ranges out to 500 yds or so. Then I got recommended to this site to read about the caliber. After reading everything I can find, I am wondering if my 1 in 12 barrel is going to shoot anything but a 68 to 70 gr bullet. Is shooting a heaver or lighter bullet going to actually hurt the barrel? Are any of you guys shooting a heaver or lighter bullet in your 1 in 12?

 

[AckleyImproved]

HI

1 in 10 to shoot the 75-87grainers out to 500yds.

AI

 

[philpapa]

I appreciate the reply, however, my question is "does anyone have any experience shooting a lighter bullet or a heavier bullet in a 1 in 12." Will shooting lighter or heavier bullets in anyway harm the barrel?

 

[Forum Boss]

Shooting lighter or heavier bullet won't harm the barrel in any way, provided the powder charge is safe. The 75gr Vmax should work fine in your 1:12. John S. of www.VarmintsForFun.com has had good luck with this bullet in a 1:10, and Richard Franklin has used it in both 1:12 and 1:14 I believe.

Here's Richard's web site: http://www.richardscustomrifles.com/

Mark Schronce had good luck with the 80gr Fowlers in a Lilja 12-twist: "Richard Franklin, of Richard’s Custom Rifles, was chosen to install a Lilja 12 twist barrel on my Hall action rifle, chambered in 6mm BR,with a .262" neck and Harrell's Precision muzzle brake).

I ordered 68gr and 80gr Bergers, 68gr Barts, and 80gr Fowlers. They'd be loaded into turned Lapua brass and tested with Vihtavuori N-135, Varget, Benchmark, and Fed 205 primers. Once load testing started, I found the 68 Barts, and 80 Bergers with N-135 to be a stand out. But when the 80 Fowlers finally arrived, they quickly took the lead with groups running .1" at 100yds and .250" at 200 yards. The load of 30.0gr N-135, Fed 205, at 3200fps out shot everything, hands down."

Article: http://www.6mmbr.com/Schronce600.html