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Old June 22, 2022, 01:10 PM   #1
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Join Date: June 20, 2022
Posts: 2
1:11 twist barrel 300 win mag - 180 gr SST

Hey y'all!

I recently got an old Sako Finnbear A3 in 300 win mag, and I understand that rifle has a 1:11 twist barrel. I took it out to the range and shot groups with 150gr Hornady interlock bullets, 165gr Barnes TSX, and 180gr Hornady SST. The first 2 shot fine, but I couldn't get the 180gr load on paper at 100 yds. I brought my target back to 20 yards and grouped about 1.5" at 20. So I'm wondering, will a 1:11 twist barrel stabilize the 180gr SST? I can't think of any other reason it isn't hitting paper at 100.

Also, the 165 impacted about 5 inches to the left of the 150gr at 100 yards. I don't know why a different bullet would group that far left/right, so if anyone has any ideas, please let me know.

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