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Twist & bullet wt for 25-20 (Read 5263 times)

pmcfall Senior Forum Member Offline Posts: 265 Location: St. Joseph, Missouri Joined: Jan 27^th, 2006	Twist & bullet wt for 25-20 Feb 20^th, 2018 at 2:21pm	Print Post
	What is the longest bullet I can expect to stabilize in a 25-20 SS (bore .257.5) with a 12 twist? Thanks Phil


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pmcfall Senior Forum Member Offline Posts: 265 Location: St. Joseph, Missouri Joined: Jan 27^th, 2006	Re: Twist & bullet wt for 25-20 Reply #1 - Feb 20^th, 2018 at 6:58pm	Print Post
	I've used the twist calculators I found on the internet, but I don't think I believe them. Phil


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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Twist & bullet wt for 25-20 Reply #2 - Feb 20^th, 2018 at 7:03pm	Print Post
	Schuetzendave will know when he comes along.

	"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4234 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: Twist & bullet wt for 25-20 Reply #3 - Feb 20^th, 2018 at 7:16pm	Print Post
	Caliber 0.258 Inches Bullet Weight 110 Grains Bullet Length 0.946 Inches Barrel Twist 12 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.37 Caliber 0.258 Inches Bullet Weight 100 Grains Bullet Length 0.859 Inches Barrel Twist 12 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.64 Caliber 0.258 Inches Bullet Weight 90 Grains Bullet Length 0.774 Inches Barrel Twist 12 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.98 Sg shouldn't be less than 1.4. If Sg is greater than about 2.0, you may gain some accuracy by going to a slower twist barrel. A 90 to 100 grain bullet is suitable for the 12:1 twist barrel.


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pmcfall Senior Forum Member Offline Posts: 265 Location: St. Joseph, Missouri Joined: Jan 27^th, 2006	Re: Twist & bullet wt for 25-20 Reply #4 - Feb 20^th, 2018 at 8:16pm	Print Post
	Thank you very much. I'm getting ready to have a new mold made and wanted to make sure. I've shot some excellent groups with some 108 gr bullets but they might be right on the edge, I'll have to measure their length. Thanks again Phil


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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Twist & bullet wt for 25-20 Reply #5 - Feb 20^th, 2018 at 8:59pm	Print Post
	Phil a good mould maker the likes of David Mos. can also very clearly steer you in the right direction so I would not hesitate in running it by whom ever that may be as well when you go to order your mould. JLouis

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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pmcfall Senior Forum Member Offline Posts: 265 Location: St. Joseph, Missouri Joined: Jan 27^th, 2006	Re: Twist & bullet wt for 25-20 Reply #6 - Feb 21^st, 2018 at 7:37am	Print Post
	That's exactly who I plan to have make this mold now that he is back in business. Phil


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Geezer Participating Member Offline Posts: 35 Joined: Jan 5^th, 2018	Re: Twist & bullet wt for 25-20 Reply #7 - Feb 27^th, 2018 at 1:47pm	Print Post
	Timely discussion for me. I'm new to quarter bore shooting and appreciate the information. I have a Ballard 25-20 SS with a 1-10 twist bore. Assume the above info will work OK in that?


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frnkeore Frequent Elocutionist Offline Posts: 7661 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Twist & bullet wt for 25-20 Reply #8 - Feb 27^th, 2018 at 3:41pm	Print Post
	With that twist (10), you can shoot a bullet 1" long. Frank

	ASSRA Member #696, ISSA Member #339
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Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4234 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: Twist & bullet wt for 25-20 Reply #9 - Feb 27^th, 2018 at 4:21pm	Print Post
	For a 10":1 twist: Caliber 0.258 Inches Bullet Weight 110 Grains Bullet Length 0.946 Inches Barrel Twist 10 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.97 Caliber 0.258 Inches Bullet Weight 122 Grains Bullet Length 1.049 Inches Barrel Twist 10 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.62


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bpjack Frequent Elocutionist Offline Posts: 3797 Location: East Olympia, WA Joined: May 18^th, 2008	Re: Twist & bullet wt for 25-20 Reply #10 - Feb 27^th, 2018 at 8:11pm	Print Post
	Geezer, I am shooting the NOE 117 gr spire point in my 10 twist 25-20 win. It it stabilizes just fine and is very accurate. Jack

	People who think they know everything are a great annoyance to those of us who do.
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Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4234 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: Twist & bullet wt for 25-20 Reply #11 - Feb 27^th, 2018 at 8:23pm	Print Post
	Gyroscopic stabilty factor for Jack's NOE bullet: Caliber 0.258 Inches Bullet Weight 117 Grains Bullet Length 0.993 Inches Barrel Twist 10 Inches/turn muzzle velocity 1600 fps Temperature 50 degrees Fahrenheit (59 is standard) Pressure 29.92 inches of mercury (29.92 is standard) Sg = 1.82


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