Customer service could've gone one step above and beyond by checking with a knowledgable staff person and then getting back with you. But, I keep forgetting that few folks bother to step outside of their box these days.

I hope you get your answer.

 

I appreciate it. To be fair, I called Monday (holiday), and she said the engineer wasn't at work. They were aware of my question and said they'd get back to me. I'm likely being impatient because I want to get my order in. Wait time went from 12-14 weeks to 14-16 weeks in the past 3 days.

 

Industry standard twist for a 9mm Luger is 1:10".

 

Unless a Colt, Wilson, or KKM at 16” or a Schueman at 24“ gain or even 32” if you want to load 115 gr 9mm Major.

 

Schumann was the one I know had various twist rates. They were, I believe by special request and not sold as standard. I'm not saying they don't offer other twist rates, but I don't understand why they would not specify it if they are varying.

What was their logic (Colt, et al) for using the slower twists?

 

They didn’t tell me.
But I guess that they started with a 16” twist in .38 ACP and saw no reason to change.
KKM will apparently twist to order although standard at 16”.

i understand the twist effect on terminal ballistics but it is not a purchase criterion for me.

 

SAAMI lists standard twists for 9mm as 1:10", and 1"16" for 38S, 10mm, 40, and 45.

 

Glock uses 1 in 250mm (1 in 9.84"). The original Colt Python used a 1 in 14" ROT and back in the day S&W used 1 in 18.75”. Many said that is why the Python shot heavier bullets better in theory. Personally, I think ROT is very important and moreso in rifles. Of course, debates rage online to this day whether the Greenhill formula is correct. For old blackpowder cartridges I swear by it. Remember however that bullet length is the factor and not weight so much.

 

I haven't pushed a patch and swivel handle through mine but just looking I'm going to say it is 1:16 twist.

 

I just looked and saw that I got an iPhone email from SA about an hour ago saying simply "1:10". I'm looking forward to confirming that.