. . On the all metal stocks. Will the metal have any problems with vibrations, or dampening of the vibrations from big boomer 1000 yard chamberings? Seems like we use wood and synthetic materials for the dampening effects in most all other rifle designs. any thoughts on this?
No problems with metal. Put it this way. There are two differences between a 1K Heavy Gun and a point-blank rail gun.
The first is that the front and rear pedestals cannot be conjoined
when you shoot. If you look at that web site, you'll see what appear to be one-piece rests. They are, but there is a plate holding the front and rear together. Before you start shooting, you take that plate off. Now the front and back aren't conjoined.
The second difference is the rifle must run on sandbags, not (say) V-blocks and delrin. If your rifle doesn't return to battery 80% of the time, you're not set up right. The difference lies in the fact that you have to look, and maybe adjust, after each shot. There is always that 10-20 percent chance the rifle didn't quite "return to battery." Though in fact, in order to shot as fast as possible, you sometimes ignore the little bit you're off. Depends on how bad the wind is and how far off you are.
OK. What are the most common materials used building point-blank rail guns? Steel and aluminum, right?
* * *
What first attracted me to 1,000 yard benchrest was the lack of equipment rules. There are a lot of "that won't work" notions in point-blank BR, I guess passed down from one generation to the next. Since they ran contrary to some rule or other, apparently nobody ever tried them, because in fact, many work just fine.
The Cass brothers, for example, had Light Guns where the "forearm" was a plate that clamped to the barrel, very similar to the "forearm" Gene Begs now uses in his ultralght stock. The rear "butt" on the Cass design was a small plate bolted to the bottom of the action. Except for the pound the scope weighted, and probably another pound for those front and rear "plates," everything else in the 17-pound rifle was the barrel, and a plain Winchester model 70 action. The Cass's won a lot...
While on them, their HGs weighted abut 180 pounds, and were chambered in 6mm/06. All metal designs. That 6/06 would send 107-grain Sierrra's off about 3,600 fps. So much for the notion that 6mms won't shoot over 3,000 fps -- or any particular number. As long as the bullet will hold together, and you can keep going up in powder, you'll likely find another speed they'll shoot at.
Anyway, they'd set the rifle up and fire about 5 shots as fast as they could. The rifle recoiled about an inch or so with each shot. After each shot, they didn't bother pushing the rifle back until they were running out of room on the bags -- usually about shot 5, so they'd only have to push the rifle back once. Talk about shooting fast -- a little over one second per round.
Oh yeah. Those HGs won a lot, too. Now that goes against the statement attributed to Bruce Baer in that 6mBR piece. 180 pound rifle that recoils about an inch, and shoots like a bat out of hell. Using a model 70 action. The Casss brothers only shot 4-5 years, but they're about middle of the pack among the 60 or so people who have achieved the IBS Long Rang Marksman jacket.
Speaking of that 6mmBR.com article -- they talked aout the tensioned barrled rifles I & some others were making (Charles Bailey was the first at our range, but the idea is so old, it had been patented. The patent had long run out by 1995.) Anyway, the 6mm BR.com article got how they are built wrong -- most, including the one pictured, use jacking screws, not a nut (though I've done that, too). And the point was not to lessen vibrations
per se., but to move towards a double-cantileverd beam system. In other words, wherever the low-harmonic vibration's are moving things a lot, it ain't at the muzzle.
Etc.
With everything that's been tried, and worked, I get terribly hesitant saying, at least about a general system, "that won't work." It probably will. As always, the devil's in the details.