I don't care how you cut it, a 20 or 25 gn bullet at 4000 fps and 240,000 RPM in a cup and core design is not a big game bullet. And it is the utmost irresponsibility to hunt big game with this bullet at this velocity. The bullet is barely staying intact just from the centrifugal force, add hitting a 200 lb animal and expecting any sort of penetration is ludicrous. I'm vaporizing 80 gn bullets at 3700 fps in a 1-8 twist 22 cal rifle at about 30 mtrs from the muzzle. How can anyone say they are getting any penetration from a 17 @ 4000 fps. I know for a fact Sisk bullets has been out of business for at least 40 years.
What you say is true - well - 'cept for maybe the irresponsibility part - I'll still be responsible if I shoot a deer with a ridiculously small bullet.
I've shot quite a number of deer with a high-speed bullet out of a 22.250 - and I expect little penetration - like you say - but the energy does not just dissipate harmlessly, but seems to become a predictable shock wave that does kill. There are limits I'm sure - and I'm not about to do a gut shot or a hip shot or a leg shot in an attempt to find the limits of the little bullets. I can't say what fast .22 bullets would do in those shots - but I can say what the bullets do in certain other shots.
This could get long - sorry.
I've done three high shoulder shots - those were years ago - remembering what was recommended in old Outdoor Life magazines - and all anchored the deer - the shock wave is transferred into the spine and no tracking is required - but kill shots are - and there is too much bloodied meat.
I started to shoot back further. The lungs are really delicate of course - and if I shoot a little high of centre, I don't damage the heart meat - if I can see and have time to choose, I'll wait until the near leg is forward - to be sure that the bullet doesn't damage leg meat. If the bullet hits a rib, the bullet stops - I suppose - I never find them in the mush that is made of the lungs by the bone shards and shock wave.
Twice, the bullet has hit a little higher than I intended - the shock of impact going up the ribs and - like shoulder shots - going into the spine and anchoring the deer.
Digging up memories - but this is taking too long - and we have deer to cut today - so I'll continue this later.
...Cuppa tea while warming up - skinned our last two for this year - one 22.250 and one with 243. What a hole that 243 left! - entry from high forward rib cage - going down to leave an exit hole big enough to put a fist through - bloody from high on the neck all the way to behind the exit hole. The 22.250 damage is much more local - thank goodness. Cutting time.
...Okay - that's done - two pressure cookers warming up with 14 jars of choice cubed meat in them. Roasts and burger bagged - and lots of scraps for Fido. What a mess that 243 made of the deer - both sides of the skinned carcass were bloodshot. I took a picture of it - but what a mess - I said that before. The bullets would have been handloads - nothing special.
Back to memories of light fast bullets out of a 22.250 - if the shot is a little high, the spine is taken out - a little low and the heart gets wrecked - a little forward and high and the shoulder shocks the spine. I did one high and back a bit from the diaphragm - a slightly cornering shot from the rear and it cut the - uh - spleen? - which bled out well too - same as a lung shot.
Occasionally, the bullet does not take out a rib on the way in - and so may leave an exit hole - had one like that this year - and once had an exit hole the size of a loony on a bear - but exit holes are really really uncommon - so bleeding is almost always internal with no blood to track until the deer starts coughing blood.
In my experience, deer that are hit where they live by a 22.250 have a very limited lifespan - about 50 yards would be max - but usually half that.
Once, I used a 243 at 240 yards on a walking deer - I was waiting for the boy to shoot and he never did - so I took a last-second shot as it left the field - gut-shot, it still died less than 40 yards into the bush. If I can't see the deer go down, I sure prefer to leave it for 20 minutes to settle down and expire. That was a desperate last second shot that... I guess that a 22.250 would kill - but it would definitely be further away and harder to find - that was a few years ago - I've been pickier of my shots since then. Some guys need to take every possible shot - and for that - a 270 would be more likely to knock 'em flat - but like we all know - more power doesn't make up for bad shot placement.
About the possible .17 experiment - I will get a .17 Remington set up and shooting well for me - maybe try it on coyotes or wolves yet this winter - then decide whether I can take a deer with it. Maybe it has too little power - but I'll leave off supposing until I have more evidence to consider.
The pressure cookers have a head of steam up and it is time to put the studded tires on the family car.