Tam D good points. I don't think the stocks of traditional lever actions can be made stronger with a thru bolt but I believe that is the design on the Henry Ling Ranger and BLR.
In the fantasy world where Blaser sees the light and comes out with a lever that is a variant of the R8, they would come up with something more efficient. But one can install a drawbolt in the Marlin, and the Winchester, as McPherson says. McPherson has just published a book on customizing the Marlin that is the size of a medium sized phone book. I have a copy, but I have only poked through it slightly. He is what he used to have on his Website:
"The next weakness is the two-piece stock. With only the conventional tang bolt attachment, any such stock is prone to failure. Considering the limited amount of wood reaching forward of the tangs and the stresses associated with side loading, we are not surprised to see longitudinal cracks reaching rearward of the tangs in older, well-used guns.
The other problem with the two-piece stock is that this system makes it impossible to isolate the barreled action from the bench and associated variations in shooter hold, etc. Firing good groups with any such gun is an exercise in patience and in paying attention to details that even many serious benchrest shooters might not have even considered.
After years of serious testing, I have concluded that how the shooter holds his tongue probably matters! For sure, how solidly the shooter holds the gun and presses his cheek against the stock will significantly alter the zero. In a related characteristic indicative of just how significantly these guns interact with shooter and bench, on a good day, I can call high and low hits when testing a Marlin 45-70 and I can do so without looking at the target — all I have to do is look at the chronograph! If shot velocity is slower than mean velocity the bullet will hit low; if shot velocity is faster than mean velocity, the bullet will hit high.
I mitigate these problems by installing a throughbolt that runs from near the rear of the buttstock to a hanger that I install on a replacement, hardened-steel tang bolt. With proper glass bedding, this modification allows me to significantly compress the wood of the stock along the grain (with more than 1000 pounds of force). Such compression monumentally reduces the potential for lateral loading to result in a crack in the stock. It also allows me to bring 100% of this force to bear on the front flats of the stock, where it should be, so that the buttstock and receiver are bonded in both the vertical and the lateral plane, to the extent possible. Finally, because the tightened throughbolt bends and stretches the tang bolt, it automatically clamps the rear of the tangs onto the corresponding flats in the stock, which further improves vertical buttstock attachment rigidity.
I owe this idea to my friend Steve Meacham, who used a more elegant version in his excellent reproduction 1885 Winchester rifles. In those rifles, with the right chambering and best loads, I have proven consistent varminting accuracy with the 225 Winchester consistently producing 100-yard, five-shot groups in the 2s (less than 0.3-inch separation of centers between any two shots in the group). This would simply not be possible if buttstock and receiver were not so well bonded."
Now all that said the idea of building a big lever action and shooting something big and scary does appeal to me. I wasted an hour last night looking up the new Winchester Model 94 available in 450 Marlin. Not an elephant gun but I'm not going to hunt elephants anytime soon. It looks almost perfect as the basis for a project. Maybe after I pay off my land and buy a boat I'll try it. With a laminated stock and some bedding it could be made reasonably weather proof. There is even a take down version.
Why not the 1886, it come in the 45-90, and it provides a lot more headroom. They are heavy, but that seems to be a good thing when full charges are let rip.
This is the Brockman Marlin, and I think it has a glass stock. Most of his rifles have laminated stocks.
M Loc handguard below, I think it makes all kinds of sight placement possible. I think it alllows the barrel to free float, but if it doesn't it certainly could, if it is worth the receiver being redesigned. The first thing like this that came out retail was a Zombie gun, but a tubular forend is the holly grain on a gun like this, if you want to step forward and solve a lot of traditional problem, such as magazine durability, sight placement, and free floating the barrel. Levers are a good design, but so far they are still hanging back 125 years. And visually if one wanted to make it seem in line with the past, it could certainly adopt this change and still look a lot nicer than the average Blaser. And mounting decent sights wouldn't cost you 500 dollars. But at the moment, cowbow action shooting seems to be carrying the weight for sales.
Now going totally crazy I wonder if a traditional Marlin or Winchester could be made with an aluminum reciever. Might save some serious weight. I'd put the weight back in as a heavier barrel. So theoretically more accurate.
Certainly not with the Winchesters as they have a strong rear lock, so the whole receiver is stressed. I would imagine the BLR would be OK, it has a turning bolt arrangement, I believe. I think there is some maker that has an alloy receiver out.
The big excitement will be to see what Ruger comes out with now that Remington has handed them the batton. I don't expect much, but they might make something available in the 50 Alaskan, or something like it. There seems to be some demand. It's a digital weapon after Ruger finished with it, so making changes is not going to be impossible.
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Let me just state again that I realize the bolt is the proven repeater in this field. Which not only points to it's superiority, but it also means than in any area where a lever excells it will either be regarded as cheating, or as something one does not need or the bolt would not already occupy the field, so there is not really any place for forward movement.