Does anyone know whether the .20 & .17 Myra Extruder conversions are still available and, if so, who does them ?

Sprinter Arms in SA did the conversions or supplied the barrels at least. Pretty sure Keith Bridgeman will still supply a barrel and build one for you if you want it.
Cheers...
Con

All that work was in the 1960s and 70s . I doubt anyone has stocks of such barrels now , but if you have the money I'm sure there is an engineer out there who can make what you want .....

Its a neat concept , I have seen projectiles from the 22 rimfire extruder barrel . Way cool stuff , just a little too advanced for the times....

I have a 22/17 Extruder TC Contender barrel that was made in the US a few years back. It is fun and not many people have one but I probably would not build another one with the 17 rimfires finally on the market.

Thanks for the feedback.

Only reason I was even considering this was I have a large stock of std vel 22's which is not great for hunting. This would have been a useful way to use them as hunting rounds rather tin can fodder.

Joe

JFE,
Get an Engineering firm to make you a die in which you can insert your cheap .22RF ammunition and the lead projectile sticks out about 3/4 of the way. File them flat so they become more wadcutter like, similiar to the Power-Point nose but without the hollow-point. Now use them on game and you might just be VERY surprised.
Cheers...
Con

there is a discussion here you might find interesting

http://forums.sixgunner.com/%2522lr_SGB_tool%3F/m_19582/tm.htm

just use the std velocity .22 ammo as is - it is quiet , and wont disturb other game in the immediate area . I pretty much use std vel ammo for all my .22 shooting , can shoot bunny after bunny out of a bunch without the rest getting overly alarmed.And the more you shoot the better you will get with it .

Nothing cheaper than wots on the shelf already.....

I used to have one of Arthur's 20 cal extruder BBLs on my old 10/22. Worked ok, trajectory seemed about the same (maybe a tad flatter, but nothing to worry about in the field) but a bit better penetration. And it didn't seem to matter what ammo I fed it, at about .4MOA, the accuracy was outstanding, way, way ahead of the old 10/22 BBL. Which is principly why I bought it, as it shot so well. Not so much for all the other claims about them, just the accuracy.
If Sprinters will build one like that, go for it. It won't be an earth shattering leap forward, but if it's more accurate than what you have, what do you lose?
Muzza is right in that respect, go with what you can get, inexpensively, that works. Put the rest of the time and money into trips to the range, and hunting.
That will get you a much bigger payoff than any 'gadget'.
JMHO.

Guys - thanks for your feedback.

Sambar & Mike - you are the only blokes I ever heard of that have actually had one of these conversions.

To rounds things out, I contacted Sprinter and they do indeed still do an extruder conversion. They reckon that there is still modest demand for the conversion. The comment made was that in their experience the .17 version had too much fouling and needed quite a fast twist rate to stabilise. I guess squeezing down a 40gr .22 down to .17 is probably asking a bit much. They no longer do that one. The .20 extruder is based on a 1:10 twist and works well. As Sambar mentioned, the main difference is accuracy, with other gains being marginal. Reckons accuracy is as good as what you would get with a good rimfire.

The downside is the cost. At $465 fitted, you can buy a lot of .22LR HP's.

Joe

My 22/17 is built on a 1:6 twist .17 barrel blank. It stabilizes just fine but it does lead pretty heavy and needs to be cleaned every 100 rounds or so or the accuracy gets pretty poor. I have caught some bullets and the 40 gr .17 bullets look like a very long flat ended cylinder shape. I had it built about 1997 when it looked like the 17 rimfires were never going to make it to the commercial market. Now, of course, the 17 HMR will shoot circles around it.