About the same, might be too much for a 15 year old first time hunter/shooter if so look at something a tad easier on the shoulder as not to ruin the shooting of what might have been a great shot before flinching.
Better try out a 338 Marlin Express. Nearly duplicates 30-06 ballistics in a lighter package with about the same recoil as an '06 with more terminal snort. Both the 300 and 7mm you mention will boot the ass off a mule, where an 06 won't quite do that. Now, if you aren't the 15 year old, try him out on your '06 and see if he can stand up. If not able to stand, start him on a 243 or 270; a new hunter/shooter will not be going after bison or elk for a while unless he has more money than sense. If you are the 15 year old, get started with something a bit more reasonable or you will never become a marksman or successful hunter; you'll flinch with every trigger pull after the first, for ever and ever. This mental lock you have on the '06 is startling. No question that it will do for anything North America has to offer for game or gremlins, but it is overkill for almost everything smaller than pronghorn. It is without doubt an excellent old cartridge, but possesses no magical powers.
Ghrit, you hit the nail on the head. IMHO, I would go with nothing less than a 75mm RECOILESS Rifle, or better yet, see if there are a few of the older 90mm RR's to be had.
If by chance you are stuck on one of those two, I would recommend the heavier one, with a nice pad. When I was about 19 years old, at about 165 pounds (and 6'), I borrowed my dad's friend's ruger mark something 7mm rem mag. I loved that gun. I've since shot three deer with it, and I would trust that rifle with a shot on anything. With the weight of that rifle and a nice pad, I can honestly say that it didn't belt me much worse than my lightweight Browning A-bolt 3006. The one difference between me at 19, and this young man, may be that I had been shooting for a long time before that. Hopefully he has been, and can handle an incredible gift from his dad. ... given the choices, and for purely sentimental reasons, I pick the 7mm.
As in all cases, recoil depends on the platform. Weight, stock configuration, and operating system have a lot to to with what gets transmitted from the chamber to the shoulder, and even that can be subjective. In any given case, you can arrive at some conclusions about relative puissance based on energy of the bullet as it leaves the muzzle. For that sort of data, you need to go to a site that has loading and ballistic data. There are many, and I'm not going to do your research for you. If you haven't yet fired your '06, you really should do so. It'll give you a far better idea of what you are dealing with. Notwithstanding your profile claim to be a "gun mechanic", the questions you are asking point to very little in the way of experience with firearms of any type. That said, you are looking to start off way too heavy. Fall back a bit and get a quarter bore of some flavor (or a 22) and get some experience. Anything above 30 cal can be brutal, not a good place to start. I stepped up to a 270 at age 12, consequently I'm reasonably recoil proof (or was until I got the rotator cuff repaired. Haven't gone above 7.62X54R since that.) Now, knowing you are in SoCar, and knowing more than a bit of the culture there (in-laws and outlaws still there) I'd bet heavily that if you ask nicely, you can find someone that can take you to a range and wring out the '06. If you are really nice, you might even find someone that will let you shoot his or her pet projectile pusher in whatever caliber it might be. We've been watching your posts for a clue as to what you are really trying to do with the rather disjointed questions and claims. It might be useful for us to know what it is you are doing or wanting to do. Frankly, it looks like you don't really know what you want to know. There are lots of folks here that would be willing to help you get started, but not a damn one that is willing to pry open a closed mind. This thread sorta points to a bit of opening, following as it does your previous threads that were pointing at a completely closed brain box, making assertions that have no meanings and questions that did nothing but create laughter. I can see from the responses posted on this thread that there are some folks taking you seriously, and I'll admit I'm coming around to that idea as well. If you would rather not put up any details of your situation on the site, feel free to PM any of those or me, but please be prepared to own up to the actual situation so you can get the best advice.
1+ on what Ghrit said. If you already have a 30-06 then you do not need anything else. That round won WWII. It is big enough to take any animal on the north American continent if the shot placement is good. It is a VERY good all-around round. Practice with what you have, become proficient with it, and it will do everything you need. WWII riflemen were armed with M1 Garands that used the 30-06, and sniper rifles also used the 30-06. Like the .270 or .308 it is an excellent round.
If you haven't yet fired your '06,???? Wtf(?) are you trying to do with it? 300 win mag, 7mm(mag) and 338 are stout. cartridges. As you were; I don't need to troll "firearms" just spools me up...
Or you could buy a IDOTUSA recoil pad from the member of this group that makes them and wear it when you shoot. That way you could shoot any thing you want without being bothered by the recoil. They will bring 7.62x54r heavy ball down to the level of .223.
'Till Quigs found that table, I didn't know that an '06 was a heavier kicker than an M-N. For sure, the M-Ns are easier to handle than a 30-40, both with military wood. Damn Krag hurt me years ago, taught me a few things about pulling it in tight. "That way you could shoot any thing you want without being bothered by the recoil." Would that include a 50 without a brake? Owie.
physics,felt recoil Depends on the weight of the rifle,weight of the projectile,(30-40 kraigs were carbine length? I think?)
never shot one "everybody"I've ever known who shot one said they were a bear. Ammo must be expensive for them? Winchester 30-40 180 gr box of 20 - $38+ and shipping.
im not really worried as muchh about the recoil as i am if the scope comes back and gives someone a nasty wound