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.22LR Velocity vs Barrel Length
Discussions related to Guns and Firearms
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Aloysius
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PostPosted: Fri Oct 22, 2010 12:22 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Low resolution pictures just travelled to Texas. When you want more details I'll try to make some pictures in daylight, just ask.
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slimjim
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PostPosted: Sat Oct 23, 2010 6:03 am    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Aloys, the pictures were great! Thanks!! I finally found some a jackpot of information on the web on the Marlin 39.

www.thehighroad.us/sho...=marlin+39

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slimjim
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PostPosted: Wed Oct 27, 2010 7:21 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Ok, here is my plan. I'm going to take my Marlin out to the range and do a 10-shot string for velocity measurement with its stock 24" barrel. I'll then cut about 3" off the barrel with a hacksaw. Repeat the velocity measurement, cut 3 more inches off and repeat again. I think I want to go for 18 inches but may cut finer as I seek a comfortable balance. Post velocity measurements, I'll have the barrel recrowned and a dovetail added for the magazine. This will be a true test of barrel length vs velocity because its all from the same barrel vice barrels from different manufactures with different bores and rifling. The only ammo that showed optimum performance at 16 inches was the CCI Green Tag. I don't have any more and I'm not sure its readily available anymore. I think I'll use the Federal Bulk and Target, Winchester Bulk, RWS Target, and Aguila. That will be 150 rounds. Suggestions?

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Pumpkinslinger
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PostPosted: Wed Oct 27, 2010 10:24 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Won't you have to at least deburr the muzzle after cutting? Should be an interesting test.

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Aloysius
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PostPosted: Thu Oct 28, 2010 1:28 am    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

SJ, buy a reamer, cut a new .22 chamber in the 3" barrelpieces and fix them inside another cartridge as a cal 12 shell or put it on a lathe to give the outlines that fit in your revolverchamber. A nice thing for traphunting or even giving the last extra headshot.
That's some extra fun and your environmental foothprint will become a little smaller Smile
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slimjim
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PostPosted: Sat Oct 30, 2010 5:20 am    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Aloysius wrote:
cut a new .22 chamber in the 3" barrelpieces and fix them inside another cartridge

Interesting concept. Guess the bore would have to be offset to make it work.

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slimjim
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PostPosted: Fri Nov 12, 2010 11:59 am    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

I committed to this project today! I pre-cut the barrel to make it easier to cut-off barrel sections at the range. Hopefully, I'll have some velocity data soon - all from the same barrel. The extra cut in-front of the dove tail will allow me to keep the dovetail on the lower section of the barrel which will make the gunsmith's job easier when he relocates it.

I'm thinking 18.5" to 19" looks about right with the front stock. Any shorter and it will start to look stubby.



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44marty
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PostPosted: Fri Nov 12, 2010 7:39 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

Very nice experiment, Slim. It will be interesting to see your results. Will you be trying both standard and hyper-velocity ammo?

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slimjim
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PostPosted: Fri Nov 12, 2010 11:04 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

44marty wrote:
Will you be trying both standard and hyper-velocity ammo?

I've decided not to buy any more ammo. I must have X000+ rounds already. I plan to use Federal Bulk and Target, Winchester Bulk, CCI Mini-Mag, RWS Target, and Aguila. That covers the range from highest to lowest velocity from my last test. This time, all the data will be from the same barrel.

Maybe I can get out tomorrow morning.

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slimjim
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PostPosted: Sat Nov 13, 2010 9:39 pm    Post subject: Re: .22LR Velocity vs Barrel Length Reply with quote

I decided to start a second post with the results of today's assessment.

.22LR Velocity vs Barrel Length - Take 2

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