On the 223 for everything thought. The best I can do is agree to disagree. I know way to many hunters or fishermen to believe everything I hear. Let alone strangers on a forum. I'm sure we get to hear about all the wounded game that runs off.
Felt recoil isn't tied to body weight like that. There is a lot more physics involved. Recoil pulse and duration are tied to body weight and perceived recoil a lot closer. Think a car hitting a brick wall(200lb man), versus slamming on its brakes and taking longer to stop(80lb man).
My 2 kids are opposite in 1 prefers a brake and 1 prefers a suppressor. Both shoot with ear muffs. Meaning there is no one size fits all answer.
Lastly a 223 shooting a 77gr bullet has 5 or 6 ft/lb of recoil. A mild loaded 6.5cm has around 7'ish whereas a 30-06 has 20'ish. So it wasn't asked about and shouldn't be included.
Didn’t mean to insinuate that you were starting your kids on a 30/06, but I’ve seen it discussed by others here. I am not assuming you are a bad dad. I’m just asking you to reevaluate some of your arguments.
That said a suppressed 223 will have 3-4# of recoil energy and your kids will get immediate feedback on their form and fundamentals because they will see the bullet hit through the scope. Even at 100 yards. You say you are limiting their round counts because you say they get lazy with fundamentals. They’re not lazy, the recoil is just obscuring the lesson they need to learn. Putting them on a tripod to control recoil and support the weight of the firearm does nothing to promote good form and fundamentals. Much less gun safety.
Disagreeing on my statement about the 223 for hunting is allowed, but please consider the data before doing so. The combo I am referencing results in pint glass diameter wound channels reaching up to 18” deep. What can you think of that won’t die quickly from that? Most people make cartridge decisions based on dogma that has no basis in fact. The evidence in the 223 thread is voluminous. If your argument is that the data is high graded and people aren’t reporting failures, consider this. If you’re getting a pint glass sized wound channel that will still brake a moose femur and continue to penetrate to the offhand side, is more damage really what’s needed? And if bigger gets you more damage at the cost of reduced accuracy, which group do you think will have more rodeos and train wrecks?
I’d also ask you to think about your physics and recoil energy argument from your kid’s perspective instead of trying to justify preconceived notions. The effects of recoil on accuracy are pretty clearly documented and the power factor of PRS and NRL is evidence of that. Everyone shoots better with less recoil, even me and you. If your kids, want to stay on the range and shoot an extra box of ammo with the lighter kicking gun and are more confident making shots on game, where is the downside?
I’m sure you are thinking but Elmer said “use enough gun”. Elmer’s statement was based on his experience with black powder cartridge firearms and handguns with non-expanding bullets. Modern bullet construction has made that argument moot. The 223 is legal to use for big game in all but about 3 centerfire states. If you can make the same wound channel with a 223 shooting TMKs at 400 yards as you can make with a 300 WM with accubonds, why pay the recoil tax through reduced accuracy? And why make your kids pay it with a 6.5 cm?
And finally, brakes are not a great idea for anyone. There is plenty of information out there that breaks contribute to hearing loss over the long term even with hearing protection. This happens in two ways. First braked guns increase the sound signature often beyond the noise reduction rating of your hearing protection. Even if that’s not the case with your combo, brakes direct sound waves back towards the shooter. Those waves can cause damage to the cilia in your ears through the flesh and bones of your face. But beyond that, the muzzle blast has a huge effect on accuracy. You said you have a son who prefers brakes. Which do you think he will shoot better, a suppressed 223, or a braked 6.5? Which one do you think he’ll want to shoot 40 rounds through?
Like I said, this is meant respectfully and I am not questioning your parenting skills. I have a kid too and I want her to be better than I am. Passing on shooting skills and helping our kids be better shooters and more ethical hunters is something we can all agree is important.