1/32 twist

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1/32 twist

Postby floydp » Sun Feb 12, 2017 9:54 am

hello to all looking for a starting load for 450 bm in 1/32 twist 18in barrel thanks for info
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Re: 1/32 twist

Postby Hoot » Sun Feb 12, 2017 12:13 pm

floydp wrote:hello to all looking for a starting load for 450 bm in 1/32 twist 18in barrel thanks for info


Floyd, do you have a bullet in mind? I would suspect that you would want 250gr max, given the slower twist. Might be a good match for the 225gr FTX and they're less expensive than the 250s. This is all speculative since I've never used a barrel with that twist rate and barrel twist is not a parameter you can adjust in QuickLoad.

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Re: 1/32 twist

Postby floydp » Sun Feb 12, 2017 2:21 pm

HOOT I was looking at two hornady #45177/451771 fmj-rn and #451871/45187b fmj-fp TONY M SAYS THAT THE 225FTX DOS NOT DO WELL WHIT THE 1/32 TWIST ?
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Re: 1/32 twist

Postby Hoot » Sun Feb 12, 2017 9:29 pm

floydp wrote:...snip...TONY M SAYS THAT THE 225FTX DOS NOT DO WELL WHIT THE 1/32 TWIST ?


I would not have guessed that Floyd, but again I stress that I have no experience with that barrel twist rate. Still has me scratching my head though...

Lets see if any other member bought one of them and will step in.

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Re: 1/32 twist

Postby Bmt85 » Sat Feb 25, 2017 2:28 pm

I was playing with a twist rate calculator and it's saying the 225 ftx should stabilize just fine. I'd say give em a try. As long as they stabilize, they should give you better accuracy then 230gr RN.
Last edited by Bmt85 on Mon Feb 27, 2017 4:45 pm, edited 1 time in total.
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Re: 1/32 twist

Postby pitted bore » Sun Feb 26, 2017 8:47 pm

Bmt85 wrote:I was playing with a twist rate calculator and it's saying the 225 ftx should stabilize just fine. I'd say give me a try. As long as they stabilize, they should give you better accuracy then 230gr RN.

Bmt85-
What muzzle velocity were you using in your calculations with the 225-grain FTX bullet?
Thanks.
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Re: 1/32 twist

Postby Bmt85 » Mon Feb 27, 2017 4:43 pm

2000 fps, 30 degrees Fahrenheit, 0 ft Elevation gave a stability factor of 1.68

2300 fps, 60 degrees Fahrenheit, 1000 ft Elevation gives a stability factor of 1.93

Minimum stability factor of 1.5 is recommended, marginal stability is around 1.0-1.4 . I have seen some instances where a cartridge had a factor of 1.2 and was still accurate out to 300yds. So try it and find out
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