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April 6, 2011
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Can someone please tell me what the twist rate is for a stock 8" barrel is for a 357 15-2 VH.
Thanks, Matt
February 11, 2010
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I believe it was 1:14 member Pinetor has the numbers on these.
-Blacktop
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Range Officer
Range Officers
May 2, 2009
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All DW barrels were originally 1:16 -- Later on in life, this was changed to 1:12 on a VERY limited number of barrels. It is easily seen when you look down a fast twist barrel.
If I remember right, the 5" comp I sold had a fast twist in it.
SHOOT
May 17, 2010
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My long time understanding was that for the .357/38 in barrel lengths under 10" the standard twist rate for monson guns was 1:16. For barrels over 10" and up it is 1:14. However, a simple google search has some placeing the twist rate was as high as 1:18 3/4.
http://www.exteriorballistics.com/reference/pdf/Twist%20Tables_handgun.pdf
My (extremely limited) understanding is that optimal twist rate is a function of BOTH bullet weight and velocity. So a .38spl @ 158gr and at say sub 900FPS likes a fast twist rate (12 to 14) while a .357 @ 125gr and 1250FPS benefits from a slower twist rate (14 to 18). At one time I found a table showing all this but I lost the link. The probelm with the table was that it only covered very standard loads. So what twist rate would say a 180gr at say 1200FPS want... I really dont know. I think the point of what I have read is this: you only want enough twist as needed to stablize the round. More twist (than that) yields no more benfits.
Adding to all that may be range/accuracy at range. I have not had a chance to shoot past 25 yards, and I mainly shoot .38's @ 158 and sub 850FPS. So for me Erics 1:12 seemed a very good fit. (I also am only shooting 6" barrel). Now if I move up to my 8" barrel and .357 loads... I will be shooting the standard DW barrel.
Soap Box, Ballot Box, Ammo Box
in that order.
4 Monson Model 15's
1 Palmer FB 15
1 Rossi 357 Model 92 (lever)
1 CZ 75B
April 6, 2011
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I have a 15-2 that says monson,mas on the barrel. I plan to use this barrel for hunting and shooting. What I am looking for is a barrel that I can shoot 200 yards with bullets 170=180 grain cast. What is the best twist rate for this? I believe ews has the 10-12" barrels with a one in 12 twist.
May 17, 2010
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Hmmm try this:
http://www.stevespages.com/page8e.htm
Seems that its bullet length, not weight as well as velocity.
Soap Box, Ballot Box, Ammo Box
in that order.
4 Monson Model 15's
1 Palmer FB 15
1 Rossi 357 Model 92 (lever)
1 CZ 75B
DWF Supporters
June 20, 2010
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I like JBM calculators. Go to bottom of page and look for the stability calculator.
http://www.jbmballistics.com/ballistics/calculators/calculators.shtml
It includes length, weight, velocity.... Be sure to read the "Explanation of Terms"
p.s. I posted this similar response (above) yesterday, but when I logged on now, my post was gone when I looked ( so I just reposted this shorter version). Did anybody else see my prior post or am I going 
?
Winchester also has a nice on line trajectory calculator:
http://ballisticscalculator.winchester.com/
I have been thinking about writing something up for my own use, but came across an Excel ballistics file that looks real nice so far: FBC-v3.1.xls. Go to
http://sites.google.com/site/freeballisticcalculator/
and click through a page or two until you get to the download for the file.
Finally, here is a compendium of sites and tools. I have not looked at them all:
http://combatrifle.net/ballistics.htm
Enjoy 
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