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Discussion Starter #1
Got a question for those-in-the-know.....I just picked up a Thompson Center Seneca in .45 cal. Anyone know the twist rate of the barrel. I've heard it was 1:48, is this correct?

Thanks.
 

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Doesn't the barrel have the twist printed/stamped on it?

If not, Use your ramrod with a tight patch....Put a mark at 12 o'clock on the rod as you push the patch in. When/if you have one complete revolution of the rod, mark the depth on the rod. If you can't get one revolution, go to 6 o'clock (rotation) and mark the rod depth and multiply the depth times 2. That will be a rough measurement of the twist.



savageT
 

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Discussion Starter #3
No twist rate on the barrel...thanks for the great tip savageT.
 
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