Will such take a .22LR?

The slow twist barrel used for the 22 long 29 grain bullet may give poor accuracy to the 40grain 22 LR bullet.

Everything mentioned is sage advice, a couple items to think about, what distances are you planning to shoot? Indoors? Outdoors? 50', 300 yards?  I recently put a slow twist, minimal groove number in the barrel - I'm using for indoors only, 50'.  Using standard velocity ammo, it's showing potential for extreme accuracy, less bullet disruption, distortion, just enough to get it there, a lot more testing to happen yet.   
My experience with a slow twist like this outdoors where elements have effect and the distance increases, accuracy diminishes significantly.   
I'm not here for a debate, but if you have the time and resources to dabble in this and not just go off theories or hearsay, please do and give us a report.   In my experimenting, high velocity ammo in a slow twist, 1:20 twist will give fair to good accuracy to 100 yards, depending on ammo, chamber, and conditions.  Same setup at 150 yards, a 12ga with buckshot gave better results.  Bulk or cheap ammo, a worn or sloppy chamber, 50 yards with HV required effort and luck to group minute of hillside.   
Looking forward to a report.
GT

GT wrote on Jan 29^th, 2025 at 10:01am:

I think this is the sage advice!
A long time ago, back in the day, LOL I spent time in the 50/50 game. Talk about superstition and secret formulas and voodoo before every round and secrecy concerning. I think the 22 is a different duck with its heeled bullet, a shape that in a lot of ways mimics nearly a round ball in center of gravity and center of pressure, maybe doesn't fit the Greenhill formula expectations well, and so therefore gives many none standard results under varying conditions.
As GT said, please report what you find 

notlwonk wrote on Jan 30^th, 2025 at 11:00am:


Not much.  Back in 2008, I played with an odd-sized .22 rimfire, measured .226" groove diameter, 18" twist. Later learned it was chambered for .22 Extra Long.  Paco made me one of his tools, several holes, sized bullets anywhere from .221 to .2265.  I also bought a Waltz die, fattened the bullets to .2261. 

Tried both. The Waltz die was much easier to use and reformed the bullet to the Eley EPS shape.  (But, IIRC, Mr. Waltz no longer makes dies.)

In that rifle, a US Model 1898 Gallery Practice Rifle fitted with a peep sight, fat bullets helped a bit, but at 100 yards, I could not keep shots closer than the 8-ring on an NRA smallbore target.  Out-of-the-box Wolf Match Extra didn't shoot even that well IN THAT BARREL.

3 weeks ago, I found some of the ammo (Wolf Match Extra) that I had fattened (some Waltz and some Paco, I'd marked the boxes) and tried it from the bench at 100 yds.  I used regular Wolf Match Extra as control.  Test rifle was an ordinary H&R M-12 military surplus job, because the fat bullets would not chamber in the BSA International.  Used a 12-X Unertl scope & the 25-ring target.  Weather: Dry, wind 5 to 10, temp low 50s.  Three 10-shot groups with fat bullets kept everything in the 23-ring, even the Paco'd stuff.  The 2 Waltz groups were a bit tighter. 2 control groups had more hits in the 25-ring, but max spreads were about the same.

What twist did companies like Winchester use in their .22's that were marked short,long and long rifle? I grew up with a 62A and shot shorts in it most of the time because they were cheaper and it shot great.

Winchester, Remington and Stevens all used 1-in-16" for the .22 Long Rifle.

For .22 Short, Winchester used 1-in-20", Stevens used 1-in-25" and Remington, for manually operated arms used 1-in-16".  For autoloading .22 Short, Remington used 1-in-24".

Presumably, the .22 Long had the same twist(s) as the Short.  No specific mention in the chart I have.

This is off Appendix 3, pp 278-279 of twists and min and max groove diameters of all calibers from .218 Bee to .38 Short, Long and Extra Long that I've had under the glass top on my desk as a quickie reference for decades.  Can't remember the book I got it out of; maybe one of Whelen's books?