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rifle twist rates
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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slimjim
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PostPosted: Thu Jan 14, 2010 8:07 am    Post subject: Re: rifle twist rates Reply with quote

When you have a group size as great as Paul's and you can't see or make out the center's of the bullet impacts, you have to measure the outside and subtract bullet diameter. Otherwise, you can measure centers like the 0.8-inch group below.

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Savagenut
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PostPosted: Thu Jan 14, 2010 4:17 pm    Post subject: Re: rifle twist rates Reply with quote

Thanks just wondered.

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stovepipe
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PostPosted: Thu Feb 11, 2010 2:51 pm    Post subject: Re: rifle twist rates Reply with quote

Always an interesting topic.

Still aint settled on load for Boomer... got two bullet weights I'm interested in....200/240gr Nos JHP for traget shooting.

Only had two half-way decent chances so far to test due to the winds in this area fouling up every session I've been out on. Literally every session has been blown out. I'm anxious to see if the 200gr works at 100/200y as well as the 240gr seeing as how the twist is 1:20 on a 9.5" tube. I'm not concerned with TB, just stability/accuracy. Couple of folk say the 200gr pill is too small for over 50y and won't fly.

At 50y it's pretty even w/ 3 loads... before it started to blow. Been too darned windy though to do any testing at longer ranges the last 3 times....I mean WINDY. (20-40mph, swirling, shifting, gusting, stuff blowing over etc...)

Same's why I always bring the .22...it's been getting used a lot of late. Laughing

Should be intersting to see if/what the diffs are in clicks of elev. at a given range and group sizes etc....and what the pistol actually likes the best.

Aint reloading and research fun?!!!! Razz
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slimjim
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PostPosted: Thu Feb 11, 2010 3:42 pm    Post subject: Re: rifle twist rates Reply with quote

stovepipe wrote:
Aint reloading and research fun?!!!!

Its grand! It very much is an exercise in consistency, precision, and due diligence. It can be every bit as challenging as any engineering task I've worked. And there always seems to be a few unexpected twist along the way.
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BigBlue
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PostPosted: Fri Feb 12, 2010 5:12 pm    Post subject: Re: rifle twist rates Reply with quote

Not that I ever read about it, but one thing I found was that a bullet that won't stabilize at lower velocities may well stabilize when pushed to a higher velocity. I had a 1-38" twist rate barrel on a .44 mag. carbine and was able to stabilize 320gr. cast bullets when I pushed them to 1650fps. I don't remember the exact length of those bullets.
Don
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stovepipe
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PostPosted: Mon Feb 15, 2010 8:06 am    Post subject: Re: rifle twist rates Reply with quote

slimjim wrote:
And there always seems to be a few unexpected [twist] along the way.

Pun intended? Very Happy
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slimjim
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PostPosted: Mon Feb 15, 2010 8:31 am    Post subject: Re: rifle twist rates Reply with quote

stovepipe wrote:
Pun intended?

You caught it!!!
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