Reeder Custom Guns - AR-15 question for the forum

Is there a way to tell the twist rate without literally measuring, ie is it marked anywhere on the barrel ? Given the fact ARs come in several twist rates from 7 to 9. I was sent a box of 64g bullets instead of the 50g which I ordered. I know my fast twist bolt guns wont shoot them.
Given the unknown, my other choice is to load up a few and try them. They do show that bullet weight in the loading manuals, so I can't be too far off.

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1:9 is one rotation every 9 inches. Use masking tape on cleaning rod. If i remember right, think Berger Bullets details how to do this?

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a few to try. Unless I build an Ark, or move west to join the other JT. I'm going to have to wait a while to test it. our gun range is 8 ft under water from the spring monsoons. Ive done the cleaning rod bit and have an idea that its a 1 in 9.

AR-15 question for the forum

Use cleaning rod with dry patch to measure twist.....

Thanks guys, I went ahead and loaded

normally the barrel will be marked with just a 7 or 9 or

Factory can tell you