"What I think...."
OK, you asked, so here goes.
I think the inclusion of a large detachable box on a scout rifle is a contrary to the original concept of the design ,but has become the norm on recent renditions of scout rifles. The scout was conceived as a shoot and scoot arm and a low volume of fire was acceptable. If needed , strippers could be used to speed the loading process ahead of feeding single rounds. However, ahead of all else, the concept of the scout rifle was portability and ease of carry. Hanging a half box of cartridges (or more) out the bottom of a rifle is not conducive to ease of handling and handiness. My own experience toting rifles with large box mags is that the mag seems constantly in the way, banging my ribs when slung, limiting my placement of the rifle on the bench or shooting prone. and limiting stowage options. There may be circumstances where upping the capacity of one's scout rifle would be an advantage, so the "provision" to allow attaching a large box seems acceptable, but in my mind, a scout rifle should not be outfitted with a large box as a matter of course.
I'll mention that I have come to the conclusion that for me, a detachable magazine on a rifle is a liability, mainly because.......it detaches. Sometimes apparently on its own, sometimes because I've done something stupid. Ever arrive at the range or to your stand and .......no mag in the rifle. A blind magazine solves that problem, and to some extent, so does a rifle with a pivoting floorplate. In truth, all a floorplate has ever done for me is to facilitate dropping rounds to the ground.
If I follow correctly the OP is afield with 40 rds. Well and good for him. My own practice of late is to equip my bolt rifles with a simple, inexpensive elastic ammo cuff. Empty, stored with the butt cuff full, I still have ammo available to load the rifle fully and have a reload as well, nothing to remember in the unlikely event I have to jump and run. Nothing to remember if I intend to transport the arm via any conveyance. Nothing to remember but take the rifle with me. (don't laugh, I have left the house to hunt, and left the rifle at home
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Loading a detachable box with strippers is not new, the old SMLE rifles had boxes that detached, but the intention was to load them with strippers. The 10 rd box on the SMLE is about the best rendition of that idea to date. Blended in with the trigger guard, tapered forward and melding with the forearm, and extremely durable. The SMLE was equipped with a proper stripper guide that secured the clip and cartridges at the REAR during the loading process.
The modification illustrated by the OP does not secure the clip at the rear and requires maintaining the proper relationship between the clip, ammo and magazine solely with the fingers. The result is what appears to be the somewhat awkward loading process demonstrated. Consider that when loading AR mags from strippers, there is a stripper guide that aids the process. No such arrangement is present on the modified Ruger. At the risk of being blunt, I see the mod as something that was done because it could be done, not that it serves a practical purpose or lends itself to efficiency.
The first scout rifle to hit the market that was affordable and not custom work or pricey like the Steyer was the Savage 10C. I bought one and still have it. Early on, I used grip tape to tape the funky side release and detachable magazine in place and there it has stayed. I load from the top, bolt open , with the forward mounted scout scope not hindering the process a bit. I have essentially equipped the rifle with a blind magazine. That early Savage has no flash hider to add to unnecessary length either, another recent trend that compromises the original intent of the scout concept. I wish Savage had built those early scouts with 18" bbls and blind mags from the onset. That likely could be done and I should look into it.
I have a Ruger 18" Predator with a conventional scope mounted. Ruger provides a kit that will allow the conversion to detachable ACIS mag. I've bought the kit, but have not installed it. The little Predator has the improved conventional follower in its Ruger flush mount 4 rd box and it has worked thus far for me. The kit requires a paddle type release similar to the Mini family, and I have had issues with the flush mount 5 rd Mini magazine detaching itself when the rifle is slung. The paddle style release requires a longer box, say 10 rd plus, to protect the release lever paddle from being tripped accidently. Thus my Predator, somewhat scout like in dimension, keeps its factory 4 rd detachable box. Because the receiver mounted scope obscures the receiver top, the detachable 4 rd box aids loading and I have retained it.
The OP can do what he wants. He can sally forth with 40 rds. To date, anyhow, we all can if we choose. His flash hider equipped Ruger will display less of a fireball when fired owing to the device attached at the muzzle. And when the time comes, he can wiggle 5 rds from those stripper into that big box hanging out the bottom of his carbine. It is after all, his rifle. His scout is a bit different from mine.