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.25 Twist Rates (Read 407 times)

Fields Participating Member Offline Posts: 42 Joined: Aug 11^th, 2016	.25 Twist Rates Jan 31^st, 2026 at 4:39am	Print Post
	What are the twists rates in the following calibers? 25-20 SS 25-20 25-21 25-35 Do they vary by gun manufacture? Thank you in advance.


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scharfe Oldtimer Offline A good plan today beats a perfect plan tomorrow. Posts: 607 Location: ny / pa line Joined: Dec 18^th, 2006	Re: .25 Twist Rates Reply #1 - Jan 31^st, 2026 at 6:04am	Print Post
	25-25 and 25 rim fire too. Also land and groove data.


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 17673 Location: Oregon Joined: Feb 2^nd, 2009	Re: .25 Twist Rates Reply #2 - Jan 31^st, 2026 at 11:12am	Print Post
	Those are all going to be around 13"-14" twist rate. I can't tell you what each maker used.

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Dellet Frequent Elocutionist Offline Posts: 1234 Joined: May 19^th, 2017	Re: .25 Twist Rates Reply #3 - Jan 31^st, 2026 at 11:50am	Print Post
	Stevens offered 1/12 and 1/13 for all Those cartridges except 25-35 and 25RF. Not sure they even chambered any in 25-35. 25RF was 1/17. Bore/groove 250/257 with some tolerances for the era +/- .002. A lot of people report a 250” groove for the 25RF, personally have never seen one, but I trust those who have. I have ammo that was produced when the chambering was introduced, the bullets measure .256”


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rr2241tx Full Member Offline Posts: 134 Location: San Marcos Joined: Mar 27^th, 2012	Re: .25 Twist Rates Reply #4 - Jan 31^st, 2026 at 11:51am	Print Post
	25-35 is commonly 1 in 8.


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waterman Frequent Elocutionist Offline Posts: 2962 Location: Behind the Redwood Curtain Joined: Jun 9^th, 2004	Re: .25 Twist Rates Reply #5 - Jan 31^st, 2026 at 5:01pm	Print Post
	The 25-35 was intended for jacketed bullets and relatively high velocity. Relatively heavy (117 grain) bullets required a faster twist, hence 1 turn in 8". The others were lead bullet cartridges. I have a Stevens in .25-20 SS with a .251 groove diameter and a 1 in 17" twist. Barrel is marked "25/20" with the standard Stevens stamp.


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.22-5-40 Oldtimer Offline Posts: 825 Joined: Feb 13^th, 2010	Re: .25 Twist Rates Reply #6 - Jan 31^st, 2026 at 5:04pm	Print Post
	12" twist in my .25-25 Ballard. .258 groove dia.


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ndnchf Frequent Elocutionist Offline Posts: 1113 Joined: Mar 6^th, 2014	Re: .25 Twist Rates Reply #7 - Jan 31^st, 2026 at 7:09pm	Print Post
	My Stevens 44 in .25-25 is 1-12 twist with a .253" groove size. Here is a twist rzte page ftom an old Ideal handbook.


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Fields Participating Member Offline Posts: 42 Joined: Aug 11^th, 2016	Re: .25 Twist Rates Reply #8 - Feb 1^st, 2026 at 3:44am	Print Post
	Thank you all for sharing your knowledge and experience as I greatly appreciate all this valuable information. I feel every time I'm on the ASSRA page It's a learning experience.


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 17673 Location: Oregon Joined: Feb 2^nd, 2009	Re: .25 Twist Rates Reply #9 - Feb 1^st, 2026 at 10:39am	Print Post
	My 1893 Marlin takedown is a .25-36 Marlin and has a 1:9" twist. This is the cartridge Winchester modified slightly and called theirs the .25-35 Win.

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