If you want to learn about your centerfire rifle you have to shoot it...
Agreed. If you need to learn how to shoot a particular rifle that is. I've shot enough rifles that unless the ergonomics are drastically different, I don't need to learn how to shoot any particular rifle. This isn't why I would use a "trainer" rifle.
you learn very little about the centerfire rifle by shooting a rimfire rifle with similar ergonomics...
I couldn't disagree more with this. Unless you're a naturally and extremely gifted marksman you need to practice. Anyone who's ever shot rifles know that shooting standing and unsupported is where the real marksmanship happens. At this it doesn't matter what rifle you're shooting, repetition and volume are key. Sure if I had unlimited funds I would just shoot .223 and .308 standing unsupported all day long. With Federal Gold Premium ammo no less. But I'm not made of money, and most us us aren't.
are you training for S.W.A.T? That is the only way you would gain any value, re; learning to rapidly use the firearm controls with speed under pressure.
Nor true and completely irrelevant to this discussion. People that have trained for SWAT understand that the Tactics part is far more important that the Weapons part. Most SWAT types aren't advanced marksmen at all. They stay alive and get the job done by flawlessly applying the tactics they repeatedly trained for, not by rapidly handling their firearms. The saying fast is smooth, smooth is fast is absolutely true but firearm manipulation speed has very little to do with it.
In addition, you learn nothing about trajectory, wind drift and the rifle's quirks, by shooting a rimfire "trainer."
Agreed. There's also much more to marksmanship than reading wind and calculating drop. As for a rifle's quirks, yes you can only work those out on that particular rifle. That being said, if a rifle has quirks that you need to work over you should probably get rid of it. Plenty of other quirk free rifles out there.
IMO, the guys preoccupied with trainer rifles, have spent too much time on World of Warcraft, or watching Hollywood movies.
Hurling stereotyped insults doesn't advance your argument one bit. I thought you were better than that.
As for "a waste of premium ammo," that is ridiculous... shooting your rifles is never a "waste."
I reload premium ammo that can often give me .6 MOA 10 shot groups at 300 meters, depending on the rifle of course. Can you tell me what the point would be of shooting such ammo to practice shooting standing unsupported at 100 yards? As mentioned above, if money was no object then sure.
It is the only way to learn how to shoot "that" rifle... Just my opinion, YMMV.
If one needs to learn to shoot "that rifle" then yes. I think most of us are past learning to shoot "that rifle". Marksmanship is an art that applies to all firearms, not just "that rifle". Firing thousands of rounds through a rimfire trainer rifle will have the same beneficial effects on marksmanship skills that firing the same thousands of premium ammo through a centerfire rifle, but at only a fraction of the price.
Now yes, if you want to improve shooting a .308 at 800 yards then a rimfire trainer will do very little to help that. However if you want to improve your ability to shoot the same .308 in various field positions then the rimfire trainer will absolutely have a positive contribution to that goal.
Every year I run into a though shot in the field that I sometimes miss. This year, it was a prone shot with a significant downhill lie with myself at the top of the hill and the target at the bottom. 250 yards, nice 5x5 mule deer buck. Started at 300 yards out, couldn't get much closer as all the does had already spotted me. Managed to crawl downhill 50 yards before the buck started paying attention. Prone at 250 yards I will hit the heart practically every time, on a flat prone shot that is. For this shot I ended up collapsing forward as I pulled the trigger. I saw the crosshairs go down as the shot went off. I shot clear under the buck and away he bounced. This had nothing to do with my ability to shoot "that rifle". I didn't have the skill or practice to make that shot with any rifle. I fully intend on practising that shot for about 500 repetitions come spring. I can guarantee you I will never miss a similar shot again. I can also guarantee you that after 500 practice shots with a rimfire I won't be needing another 500 on a centerfire rifle. The skill will be ingrained at that point. The final test will be with my actual hunting rifle at 300 yards, yes, which I know won't be a problem because of the ingrained repetition from the rimfire shooting.
But as you said, YMMV.