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twist (Read 6242 times)

Hank45 Oldtimer Offline Beer is living proof that GOD loves you Posts: 506 Location: MA Joined: Jan 21^st, 2010	twist Oct 6^th, 2013 at 7:26am	Print Post
	What is the optimum twist for the 87 grain 25-20 S.S. cartridge? Thanks for your answer. Hank45


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40_Rod Frequent Elocutionist Offline Extremism in the persuit of accuracy is not a vice Posts: 4285 Location: Knoxville, TN Joined: Apr 20^th, 2004	Re: twist Reply #1 - Oct 6^th, 2013 at 8:23am	Print Post
	Ron Smith's 25 gaintwist barrels end in a 1:9 1/2" twist. That is what works for me. 40 Rod


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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11458 Location: Why, out West of course Joined: May 29^th, 2006	Re: twist Reply #2 - Oct 6^th, 2013 at 8:25am	Print Post
	12

	A blind squirrel runs into a tree every once in a while.
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Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4040 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: twist Reply #3 - Oct 7^th, 2013 at 12:03am	Print Post
	Ron Smith's faster twist is for the 122 grain Paul Jones bullet. Westerner is right about the twist for the old barrels that were designed to shoot 85 grain bullets.


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SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: twist Reply #4 - Oct 7^th, 2013 at 12:22pm	Print Post
	But, as the faster twist shoots the smaller bullets as well as the slower twist why limit your rifle to only the smaller bullets? Get the 10" twist barrel (a standard for most barrel supplers' 25cal barrel) and can always shoot the heavier bullets when you want to.

	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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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: twist Reply #5 - Oct 7^th, 2013 at 3:57pm	Print Post
	You would be over spinning the lighter bullets and accuracy would suffer. JLouis

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: twist Reply #6 - Oct 7^th, 2013 at 7:52pm	Print Post
	JLouis wrote on Oct 7^th, 2013 at 3:57pm: You would be over spinning the lighter bullets and accuracy would suffer. JLouis I'm skeptical of this. But, will likely not purchase an 87gr mould to research.

	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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MartiniBelgian Frequent Elocutionist Offline Posts: 1674 Location: Aarschot Joined: Jun 7^th, 2004	Re: twist Reply #7 - Oct 9^th, 2013 at 4:11pm	Print Post
	Of the 2 evils, too fast a twist is by far preferable to a too slow twist. And I'm skeptical as to accuracy issues with too fast a twist. My 1:16" .45 shoots better than my 1:18" with the same bullets... Same chamber.


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40_Rod Frequent Elocutionist Offline Extremism in the persuit of accuracy is not a vice Posts: 4285 Location: Knoxville, TN Joined: Apr 20^th, 2004	Re: twist Reply #8 - Oct 10^th, 2013 at 8:04am	Print Post
	The solution is matching the speed to the twist. In the same way you can speed up a longer bullet to stabilize in a twist you can slow down to stabilize shorter bullet in the same twist. This has its limits but will work. 40 Rod


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tbird1960 Senior Forum Member Offline He shoulda armed himself. Posts: 331 Location: Brazoria, Texas Joined: Aug 14^th, 2006	Re: twist Reply #9 - Oct 10^th, 2013 at 8:40am	Print Post
	Maybe this will help. (You need to *Login* or *Register* to view media files and links)

	NRA Patron, Whittington Center Founders Club, Life Member TSRA, Life Member HGCA Distinguished Rifleman Badge #783
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SchwarzStock Frequent Elocutionist Offline Posts: 1159 Location: SchwarzWald Joined: Mar 23^rd, 2010	Re: twist Reply #10 - Oct 10^th, 2013 at 10:29am	Print Post
	MartiniBelgian wrote on Oct 9^th, 2013 at 4:11pm: Of the 2 evils, too fast a twist is by far preferable to a too slow twist. And I'm skeptical as to accuracy issues with too fast a twist. My 1:16" .45 shoots better than my 1:18" with the same bullets... Same chamber. Not sure I agree here if the possibility exists to increase velocity. Had a 24 inch, 30 caliber 1:11.3 Rock barrel that accurately shot 200gr SMKs when pushed at over 3300fps. Also shot 168gr SMKs at near 3600fps with super accuracy. The rifle was written up in April 2000 issue of Tactical Shooter Magazine. SS

	If your rifle is not in 7.62 and you can't hit what you are aiming at with de-linked machinegun ammo you are a pretender.
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MartiniBelgian Frequent Elocutionist Offline Posts: 1674 Location: Aarschot Joined: Jun 7^th, 2004	Re: twist Reply #11 - Oct 11^th, 2013 at 1:01pm	Print Post
	And my Ruger #1 in 25-06 shoots both 90 and 120 gr Sierra's equally well - I cannot see any resultant accuracy loss from overspinning the 90gr bullet. And those 90grainers were going quite a bit faster than the 120gr variety. As I said, I'm not really a believer of slow twists. Better to err on the fast side. Kinda allows you to have a better choice. And upping MV to get a bullet to stabilize in a slow-twist barrel? Now there is something I don't believe in. Too slow is too slow.


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SchwarzStock Frequent Elocutionist Offline Posts: 1159 Location: SchwarzWald Joined: Mar 23^rd, 2010	Re: twist Reply #12 - Oct 11^th, 2013 at 5:06pm	Print Post
	Ok, I'd then have say Too Fast is Too Fast. I have an AR with a 1:7 twist that will not shoot 55gr bullets accurately no matter what the velocity. Sure it will shoot 77gr bullets but not anything lighter than 68grs. Erring on the side of a too fast barrel will not always work. SS

	If your rifle is not in 7.62 and you can't hit what you are aiming at with de-linked machinegun ammo you are a pretender.
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MartiniBelgian Frequent Elocutionist Offline Posts: 1674 Location: Aarschot Joined: Jun 7^th, 2004	Re: twist Reply #13 - Oct 12^th, 2013 at 6:45am	Print Post
	Maybe it won't always work, but I definitely prefer it to a heavy bullet that's tumbling because the twist is too slow... The 'overspun' bullet will always be more accurate than the tumbling bullet. Besides, you don't match the barrel to the bullet - you do the reverse. You select a bullet that will shoot best in your barrel.


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SchwarzStock Frequent Elocutionist Offline Posts: 1159 Location: SchwarzWald Joined: Mar 23^rd, 2010	Re: twist Reply #14 - Oct 15^th, 2013 at 12:40pm	Print Post
	MartiniBelgian wrote on Oct 12^th, 2013 at 6:45am: Maybe it won't always work, but I definitely prefer it to a heavy bullet that's tumbling because the twist is too slow... The 'overspun' bullet will always be more accurate than the tumbling bullet. Besides, you don't match the barrel to the bullet - you do the reverse. You select a bullet that will shoot best in your barrel. Some times you do match a barrel to a bullet when you have a specific bullet you want to shoot. As an example Remington's M24 Sniper rifle was specifically matched to the M118 cartridge, that it how is came to be a 1:11.29 aka 1:11.3 twist. SS

	If your rifle is not in 7.62 and you can't hit what you are aiming at with de-linked machinegun ammo you are a pretender.
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