Will 1 in 10" rifling work for a 25-35?

MikeB · Post by **MikeB** » Sat Sep 29, 2007 11:31 pm

This is a follow up to my question about how to fix a bad bore in a 25-35. There were several recommendations for re-lining by Randy Redman or John Taylor. I found that Redman does not re-line this caliber. John Taylor can do the work, but the available liner has a 1 in 10â€

Post by **Old Savage** » Sun Sep 30, 2007 12:22 am

No direct experience but bullets of greater sectional density are stabilized by a 1 in 10" twist.

TedH · Post by **TedH** » Sun Sep 30, 2007 8:28 am

I don't think you would have any problems with a 1-10. Try out this calculator and see what you come up with.

http://kwk.us/twist.html

Post by **Hobie** » Sun Sep 30, 2007 8:35 am

I'm going to speak plainly about this.

#1, Winchester used the 1-8" twist for a reason. You don't get high velocity with the .25 cal 117 gr. RN, about 2300 fps max, and it is a long bullet needing to rotate to stabilize. I believe you do need that 1-8" twist.

#2, it doesn't always pay to be cut corners.

If you look at other similar rifles chambered for similar cartridges using similarly long bullets you'll note that they use similarly fast twists. There's no way around the physics.

Post by **Old Savage** » Sun Sep 30, 2007 10:10 am

Sectional density on a 117 25-35 bullet (.253) is less than that of a 170 30-30 bullet (.257) at the same velocity. Seems if one will Stabilize at 1 in 10" the other will.

Post by **Old Savage** » Sun Sep 30, 2007 10:22 am

In the 7x57 Winchester has used at least 3 different twists in the Model 70 from 1 in 8 1/4" to 1 in 10". They also used a 1 in 12" twist in the 307 wihich shoots 170s in the same general speed range for many loads according to Speer #11. The Savage 99 used a 1 in 12" for bullets up to 180 and and 200 at the same velocities or lower.

Post by **Old Savage** » Sun Sep 30, 2007 10:42 am

In Pet Loads Ken Waters reports that Remington used a 1 in 10" twist in its 25 Remington barrels. He also reports that he got excellent accuracy with a 117 gr. Remington bullet at 2124 fps in his Model 8. The 25 Remington is the ballistic twin of the 25-35.

John Boy · Post by **John Boy** » Sun Sep 30, 2007 2:12 pm

Mike, for a 25-35 - 1:10 twist is the correct rate for Winchester 94 levers and works great for single shots too. Here's one of the several tables available for reference:
http://www.exteriorballistics.com/refer ... _Rifle.pdf

If it were me, I would order a 25-35 liner (1:10) from TJ's Enterprises and have it put in your rifle.

I put a 25-35 TJ's liner in a custom made Scheutzen Gallery Rifle that was chamber reamed for 25-20. I shoot 65gr 1:40 bullets with 3.8grs of Unique (1050fps) and can make a group the size of a half dollar at 25 and 50yds.

Post by **Old Savage** » Sun Sep 30, 2007 2:49 pm

Well, if that is the case, MikeB I can tell you my 94 in 25-35 is very accurate with 117s.

M336 · Post by **M336** » Sun Sep 30, 2007 9:14 pm

I had a Marlin 336 rebarreled to 25-35 a couple of years ago with a Douglas 1-10 barrel and I've used 75 to 117gr bullets in it and they've all shot great. Get it lined and have fun with it,it's a great caliber!

Post by **Ysabel Kid** » Sun Sep 30, 2007 9:17 pm

TedH wrote:I don't think you would have any problems with a 1-10. Try out this calculator and see what you come up with.

http://kwk.us/twist.html

Cool site Ted!!!

MikeB · Post by **MikeB** » Sun Sep 30, 2007 10:06 pm

A Hornady 117gr round nose is very close to 1 inch long. Running it through the twist calculator for 2100fps says that 1 in 10.6" is needed. That at least indicates that a 1 in 10" twist is inside the ballpark.

Thanks to everyone for posting their experiences. It looks like this bullet/twist combination has worked successfully when it has been tried.

Mike

Post by **Old Savage** » Sun Sep 30, 2007 10:45 pm

Hobie ???

Post by **Hobie** » Mon Oct 01, 2007 6:42 am

The two people I know with replacement or 1-10" twist rate barrels on another platform were not happy. Unfortunately, I don't have the specifics. I wouldn't settle for a 1-10" twist. Mine is NOT a 1-10" twist.

Post by **Old Savage** » Mon Oct 01, 2007 9:44 am

Something to consider there. The one thing I know personally is that the new 94 I have is accurate so I may be back to going with Hobie on this.

MikeB · Post by **MikeB** » Mon Oct 01, 2007 10:38 am

I hear what you are saying, Hobie. The calculator indicates that stability would be marginal with the standard 117gr load out of a carbine. Is the other platform with bad results something like a Contender pistol with a short barrel? Or maybe using pointed boattail bullets? Even a small change for the worse in the assumptions would calculate as unstable.

There just donâ€™t seem to be any 1 in 8â€

Post by **Hobie** » Mon Oct 01, 2007 3:41 pm

The question is about 117 gr. Hornady RNs with barrels 18+ inches long (as I read it) and that's how I answered. Seems to me that you don't need marginal, you need for certain. IME, maybe marginal always goes bad, for certain doesn't. I only bet the sure thing.