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Very Hot Topic (More than 25 Replies) .25 (Read 10183 times)
dave_j
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.25
May 12th, 2013 at 8:55am
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i know this horse has been beaten before but...
what is the best twist for the .25 cal with a 120 grain bullet? I have a Shilen stainless barrel with a 1-10 twist in 25-20 WCF. Velocity was 1677 fps and it leaded up. Dropped down to 1430 fps and had terrible tipping.
Would a 1-12 twist be better????
  
ah heck  AA#9,4227,300MP, as long as it goes bang
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joeb33050
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Re: .25
Reply #1 - May 12th, 2013 at 9:26am
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GREENHILL
.257", 10" TWIST, .991" BULLET LENGTH AND ~120.6 GRAIN BULLET WT ARE MAXIMUM

.257", 12" TWIST, .826" BULLET LENGTH AND ~ 100.5 GRAIN WEIGHT ARE MAXIMUM

Your 10" twist should stabilize a 120 grain bullet at 1430 fps.
A slower, ex 12" twist makes the 120 grain less/un stable.
We also have Dell, Powley and Miller formulas available.
joe b.
  
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joeb33050
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Re: .25
Reply #2 - May 12th, 2013 at 9:33am
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Dell formula twist = 8.8"
Powley formula twist 1.5 stability factor = 10.3"
Miller formula twist 1.5 gyrostability factor = 11.1"
All 1430 fps
10" should do it with your bullet, Charlie's formula is very conservative.
joe b.
  
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frnkeore
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Re: .25
Reply #3 - May 12th, 2013 at 12:29pm
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Dave,
Your twist and velocity are in right in the range that everyone is doing well with. Change your lube. I suggest Smilley. The fit in your throat may also be the problem.

Frank
  
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Jerry_H
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Re: .25
Reply #4 - May 12th, 2013 at 5:56pm
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Dave,

Did your barrel lead up at Modesto last weekend? None of our's (Central Sierra Schuetzen Club) did and the three of us use 10 twist Douglas barrels with the Mos 120 grain bullet.

My rifle had a MV of 1662 fps (over Barry's ballistic system) and Rich and Steve should have been very close to that.

Like frnkeore said, try Smiley Lube (aka Javelina Schuetzen Lube). Three of the top four shooters in the QB match used Javelina Schuetzen Lube. I've got plenty, let me know how much you want.  Cool

Jerry_H
  
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JLouis
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Re: .25
Reply #5 - May 12th, 2013 at 7:56pm
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Dave get some Javelina Schuetzen Lube from Jerry, it's one of the best if not thee best out there in my book.
  
" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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dave_j
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Re: .25
Reply #6 - May 13th, 2013 at 12:46am
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well dog my cats I'll just have to try some I guess. my lube works in all my 32s but they are going slower.
and yes it did lead up in Modesto but it was quiet!!!!!
  
ah heck  AA#9,4227,300MP, as long as it goes bang
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SSShooter
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Re: .25
Reply #7 - May 13th, 2013 at 8:04am
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Am wondering if the OP has slugged his barrel to insure the bullet is a good match for the bore diameter?

As will also be shooting the 120gr Mos bullet in a 10" gain-twist barrel later this year, am wondering where to purchase the Javelina lube? Do you pan lube or run the bullet through a lubrisizer? What alloy are you casting to get to 1660fps with no leading? Thanks.
  
Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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ole7groove
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Re: .25
Reply #8 - May 13th, 2013 at 11:17am
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This is not the original Javelina Bullet Lube business founded by Jesse Smiley, the original Javelina Lube business was purchased by a member of this forum. The Previous owners Jesse Smiley and Chuck Cleave were dear friends of mine as well as is the current owner. For what is worth I believe this NY company is a label grabber.
  
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rkaires
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Re: .25
Reply #9 - May 13th, 2013 at 11:28am
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Quote:
Quote:
am wondering where to purchase the Javelina lube?


JAVELINA Bullet Lube, both in the 50/50 Formula and in the Schuetzen which is 75/25 (Alox is the first percentage) is alive and well from;

    S & S Friearms Glendale, N.Y.

    see: (You need to Login or Register to view media files and links)

C.M.M.
.


CPA sells it as well. A little cheaper than S&S I might add.

Bob
  
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rkaires
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Re: .25
Reply #10 - May 13th, 2013 at 11:33am
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Quote:
This is not the original Javelina Bullet Lube business founded by Jesse Smiley, the original Javelina Lube business was purchased by a member of this forum. The Previous owners Jesse Smiley and Chuck Cleave were dear friends of mine as well as is the current owner. For what is worth I believe this NY company is a label grabber.


Interesting you say this because the Javelina Schuetzen lube I purchased from S&S was a much lighter color and didn't melt as fast as the ones I got from CPA.
  
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SSShooter
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Re: .25
Reply #11 - May 13th, 2013 at 12:29pm
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Good that CPA sells Javeline. Will have them include when they return my action.

Are you pan-lubing?

  
Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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rkaires
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Re: .25
Reply #12 - May 13th, 2013 at 2:15pm
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SSShooter wrote on May 13th, 2013 at 12:29pm:
Good that CPA sells Javeline. Will have them include when they return my action.

Are you pan-lubing?



Yes I been pan lubing for my .32-20CPA and 40-65 with a silicone cake pan. Works good for now. I'm in touch with Willis to have him build me one of his Pope style lube pumps.
  
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JLouis
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Re: .25
Reply #13 - May 13th, 2013 at 3:02pm
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Just make sure you use a double boiler so you do not burn the lube and ruin it.
  
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SSShooter
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Re: .25
Reply #14 - May 13th, 2013 at 6:51pm
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rkaires wrote on May 13th, 2013 at 2:15pm:
I'm in touch with Willis to have him build me one of his Pope style lube pumps.

Interesting. Got a pic you can post his pump? Any idea on cost?
  
Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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