Barrel twist on Ruger M77

[hardtner]

I have a M77 .22-250 tang safety 1983 production. Any idea what the barrel twist would be?

[dcw]

Newer ones are 1:14 I would think it would be the same still. Hopefully someone can chime in that has one

[hardtner]

Newer ones are 1:14 I would think it would be the same still. Hopefully someone can chime in that has one

Thanks for the input. Anyone else with knowledge of this?

[txfireguy2003]

I don't doubt the 1-14, as gun makers have been known to do some weird things, but that seems awful slow for a .224 caliber. I know it's a varmint caliber, but it's known for being a long range varmint caliber. That would lead me to think that heavy bullets would be desirable for the better ballistic coefficient and more energy at range. Admittedly, i don't know much about 22-250, but with that twist rate in a 223, i bet you would have a hard time stabilizing even a 55gr bullet, if not, 55 would be max. With the powder capacity of the '250, seems like you could run up into the 70gr class bullets and still have adequate velocity, but not with that slow twist.

[Chad C]

Probably 1:8, I have one as well. But it may be 1:14, I've never looked into it.


Edit:
Mine is not a heavy barrel, its 1:9.

[Mike D]

Probably 1:8, I have one as well. But it may be 1:14, I've never looked into it.


Edit:
Mine is not a heavy barrel, its 1:9.

Yours would be an oddity then. 1:14 is pretty much the standard for 22-250.

[Mr. Redlabels]

My Ruger 22-250 has a 1:14

[Chad C]

Yours would be an oddity then. 1:14 is pretty much the standard for 22-250.

Yup, I was wrong. Mine is 1:14.

[Coach W]

Yours would be an oddity then. 1:14 is pretty much the standard for 22-250.

Sako; Some Savage 110, 112's and the Thompson/Center Rifle are 1:12 Twist 22-250... Bergera makes their TC barrel in 22-250 in 1:10.

But as far as I know the ruger m77 has always been a 1:14 in 22-250.

[Mike D]

Sako; Some Savage 110, 112's and the Thompson/Center Rifle are 1:12 Twist 22-250... Bergera makes their TC barrel in 22-250 in 1:10.

But as far as I know the ruger m77 has always been a 1:14 in 22-250.

My factory TC 22-250 barrel was 1:14. I sold it to get an MGM barrel with 1:8 twist.

[hardtner]

Thanks for the answers guys

[txfireguy2003]

I wonder if the higher velocity of the 22-250 would allow you to stabilize a heavier bullet because of higher RPM. Let's say you're shooting a 1-12 twist at 3000 fps (easy math). That means that the bullet is spinning at 3000 rotations per second, or 10,800,000rpm! Slow the twist down to 1-14 and you're only rotating at 9,257,142rpm, a loss of 1.55 million rpm! But if you speed the bullet up to 3400fps, you're spinning at 10,491,428rpm, a loss of only 300,000rpm. What say you ballistic experts?

[hardtner]

Any more thoughts? So the concensus is most likely 1:14?

[Coach W]

If you have the rifle on hand you can figure this out very easily.

https://www.youtube.com/watch?v=cdoCNZBlRGQ&feature=youtube_gdata_player

[Mike Javi Cooper]

http://www.exteriorballistics.com/reference/pdf/Twist%20Tables_Rifle.pdf