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First Shots KKM 13 Twist Barrel

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Post by Jon Eulette 7/27/2020, 1:07 pm

First topic message reminder :

This morning I fired frame mounted Caspian 1911 with 13 twist barrel. I shot 3.7 BE 185, 3.4 BE 185 and 3.5 BE Brazos 160. Everything shot on call. 3.4 shot very forgiving at 50 yards. The 160 and 185 recoil felt identical. Target is 3.4 load. Using 10# recoil spring. I'm going to load up some softer loads and see how it shoots. I'm a slide mount guy, so this feels funny to me. Recovery is lightning fast. I've hardly been shooting but shook them in pretty good today.
I shot 95 & 96 SF, then 40 shots TF all clean. Best target 100-8x.
Looking forward to reduced loads next time out. Will be RR'ing in near future.
I think the faster twist really helped the 3.4 loads stabilize for 50 yds. In the past with 16 twist barrels its not very forgiving. Jerry Keefer was running 3.0 BE. Next time out I will try the same.
Jon
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Post by mpolans 8/17/2020, 8:52 am

What made you switch from the Brazos 160s?

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Post by Jon Eulette 8/17/2020, 9:02 am

The Brazos 160's I previously shot were given to me (had 20 loaded rounds). I just got a shipment in to load up some with a lighter powder charge. So I was just shooting what I had on hand. In my experience so far with other pistols I can get 180/185 to shoot softer than 160's and give me better accuracy. Some pistols I've tried 160's in didn't group as well as the 180/185's. So I'm not sold on 160's yet. Still working it out.
Jon
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Post by TargetShooter27 9/23/2020, 3:00 am

Jon-

Thank you for sharing your experiment with us.  I have been intrigued with the idea of a fast twist .45 barrel since Mr. Keefer posted about it in 2016, you have now reignited my interest.  Since the reason for utilizing a 1:13 twist barrel is to impart a faster rotation on the .45 bullet so that it maintains flight integrity at slower velocities… it raises many questions.

.  Why 1:13?  I know Jerry had success with a 1:14 and reportedly made a 1:12 before he passed.  I do not remember him posting any 1:12 results.

.  What weight of mainspring/hammer spring are you using in your setup?

.  Have/will you measure the velocities you are achieving with your 2.7 and 3.0 grain loads?

.  The holes in your 2.7 target are a bit ragged, would a faster twist barrel improve that even more for that load, or is that more a function of velocity?

.  Have/will you compare the accuracy of the same loads fired from 1:13 & 1:16 barrels?  This would be very interesting but probably require a barrel-testing fixture.

.   Do you think it is possible to identify a velocity “threshold” where either twist rate has the advantage in accuracy at a given distance (i.e. 1:13 twist barrel is more accurate below 675 fps)?

.  Given the narrow velocity range (i.e. 150-250 fps) of typical bullseye loads, is it fair to say the powder load reduction possible, due to the faster twist 1:13 barrel, was less than the powder load reduction achieved by adopting a frame mount system?  In other words, the low velocity stability gains of the 1:13 barrel allows one to further refine their minimum viable charge.

I appreciate your comments and thoughts and look forward to your next update.

Scott

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Post by BE Mike 9/23/2020, 8:04 am

Good stuff! What equipment do you reload on?
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Post by troystaten 9/23/2020, 8:41 pm

Wow 2.7 grains of bulleye with a 160 grain bullet that is pretty amazing. I thought 3.7 grains of bulleye and a 185 grain bullet was a light load.  As for cutting clean holes I have found Kruger targets give a nicer hole with the slower velocity bullets.

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Post by Jon Eulette 10/19/2020, 8:54 pm

Been busy building guns and not shooting mine. Just got out and shot the 13 twist again tonight.
Today I shot 50 yards with new load; 3.5 gr BE with Zero 185 JHP. They shot on call and clustered them nicely. Brass ejected about 3 ft to the right.
To clarify earlier post, my light 2.7 BE charge was with 180/185 lswc. My lightest 160 load was 3.4 gr BE. The 180/185 feels better too me than the 160. I also group them better.
Commiefornia has no matches yet in So Cal. My next match I plan on shooting these loads.
The 13 twist rifling has been intriguing. I think it will benefit woman and men with shoulder/arm problems. And my friends who don't like recoil would definitely like it.
Building more fast twist guns now, so we'll be hearing from others in the near future.
I still plan on machine resting the pistol and sharing the results.
Jon
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Post by jmdavis 12/26/2020, 11:24 pm

I know I'm resurrecting this topic, but did you lighten the slide at all?

My memory is that Jerry was using a slide that had been lightened for PPC use on the 13 twist frame mount and that helped to get the 180gr Penn load working with 3.0.  I'm pretty sure that the 12 twist is on the last gun that he built for his shooter.
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Post by Jon Eulette 12/27/2020, 12:07 am

The slide has not been lightened. Yesterday I was out shooting and ran 2.8 gr BE Summers 180 PB lswc through the gun without a hitch. Temperature in high 60’s. The pistol is very tight. Takes a lot of effort to unlock the slide by hand. I get a kick out of the fact that it will run these light charges and still be so tight. 25yds is cake with this pistol. I have not been shooting much so I still need to see what the lightest 50 yd load can be. I have a 12 twist Douglas barrel I need to fit to one of my other guns. 
Jon
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Post by mpolans 12/29/2020, 12:29 am

I can't wait till my KKM 1:13 barrel gets in...just seems to be taking a while...but I guess that's kind of the times we live in.

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Post by Jon Eulette 1/18/2021, 2:03 am

So I went shooting today and was having exceptionally good performance with my 22. I then was doing really well with the 13 twist 45 at 25 yds with 2.9 BE 180 Summers bullets. I decided, what the hell try 50 yds with the 2.9 load.
Here’s my target. I made WAG on clicks up and errored high. Did not spot my shots. They were on call when I checked my target; called the good and the bad 😝
They felt that good but I didn’t think they would look that good considering the light charge. I was pleasantly surprised by the 7 shot cluster. 
The fast twist barrels are really forgiving to shoot. It’s been interesting playing with this gun/barrel combination. Next month I’m shooting my first match in almost a year, I will probably shoot this pistol.
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Post by chopper 1/18/2021, 6:19 pm

Jon, that is really impressive at the long with that load. Is the gun a slide or frame mount?  Your hand must be feeling good again.
Stan

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Post by Jon Eulette 1/18/2021, 7:14 pm

Frame mount Stan.
Jon
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Post by Vinkemulder 1/18/2021, 8:10 pm

Jon Eulette wrote:I was using the coated bullets. 3.5 of BE was warm, the 3.4 with 185 didn't feel as snappy. I need to pick up more of them to download.
Jon

Brazo has two diameters to pick from .453 and .452. which ones do you use? They make both diameters for all of the 45 acp lead bullets. I am not sure which one to chose and why.

Thanks for your help.
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Post by Jon Eulette 1/18/2021, 9:01 pm

99% of the time I use 0.452 bullets. Most 45 ACP barrels are 0.451 groove diameter. Typically you just go 0.001 larger than your bore with lead bullets.
Jon
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Post by rgwellsjr 1/22/2021, 11:17 am

Jon,
Is there any reason not to try the 1:13 with a slide mounted optic?  Or any advantage?

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Post by Jon Eulette 1/22/2021, 11:22 am

That’s in the works now Russel, I see no reason not to use with slide mounted optic. 
Jon
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Post by mspingeld 3/15/2021, 10:24 pm

Update? Any downside at all to the fast twist barrel? Gonna be standards issue for all future builds?

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Post by Jon Eulette 3/16/2021, 12:34 am

Will be offering 13 and 16 twist per customer request. The 13 has shot everything well. It shines with low velocity charges. I have not had time to machine rest it yet. Looking forward to it.
Finishing up one for a forum member now with a frame mount.
Jon
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