maybe some company has already built one I don't know, I would like to see a thin suppressor that's literally built into / around the full length of the barrel rather than a can on the end.  nothing longer than the barrel itself.  if you can make a sleeved carbon fiber wrapped barrel you could likely come up with a lightweight built in suppressor. 

a little over 10 years ago a couple friends wildcatted a 257/300 ultra mag,  Van Horn build the barrels for them,  they were pushing well over 4000 fps with 100 grainers ,  the downside was custom dies had to be made, and at the time a lack of suitable powders , I think they could probably push a little faster today,  one of them just died a couple weeks ago and I'll talk to the other when I get a chance.  when they were being built  I told them why not just go to a 6.5mm instead but they wanted a 257 caliber.  a 6.5 in an ultra mag case would be a screamer. 

You might want to read about (OCW) Optimal Charge Weight.   I kind of do a little different version in my ladder testing.  I pick a bullet, I try to pick a powder with the highest book velocity with the lowest pressures not a hard and fast rule as some known powders in some cartridges have become favorites with a lot of  good re-loaders. initially don't worry about seating depths that will come later,  same brass, same bullet, same primer as you normally would.  In my ladder test I don't look totally for group size but rather where each group prints on the paper.  when you find groups  when ladder testing  that print in basically the same place on the target start fine tuning charge weights and seating depths with those loads.  in other words you may shoot group 1 and it prints high and left , group 2 might shoot high and right,  group 3 might shoot high and right also, group 4 might shoot again high and right,  all are these are within reason of course,  you are looking for a node where the bullet exits the barrel at the same barrel whip in simple terms.   now take these loads and fine tune 1/2 grain  to 1 grain at a time depending upon medium to large  rifle cartridge size and see if the groups tighten,  of course you start low on your charge weights and work up safely re-loading 101.  once you get decent groups start testing bullet seating depths and see where it leads.  every rifle likes what it likes so if you have to change bullets & powders , different brands and weights that's just part of the game.  primers do make differences , but I tent to stick with certain brands in different applications.  I swear by Wolf small rifle primers in a 5.56 using TAC and 55 grain bullets in my rifles. I use Win WLRM primers in my mags although CCI Mags work also.  nothing wrong with other brands as long as it works for you.  one thing I  have found and I'm absolutely anal about stock bedding ,  all of my Weatherby's MK V's and Vanguards with the exception of a deluxe 7mm wby mag too darn pretty to scratch up.   I have glass bedded to get best consistency.  now I don't test my rifles shooting 3 shots and let it sit for  year,  I will test them until I'm happy with them,  I get them hot come back the next day or next week and do the same,  I want to see consistency from yesterday to next year so I don't have to worry about where this or that rifle is shooting.  I have rifles and ammo I haven't shot in 5 years plus and they still shoot in the same place.  that's because they are bedded right with good tested ammo and good scopes.

on all my longer range rifle/scope combo's I install bubble levels on the scopes although on some other long range I went to Talley 20 moa Picatinny bases with the bubble level installed the back of the Picatinny base itself they are pretty slick and eliminates something hanging off the scope. the other thing about this type of system it's easier to just look down on the scope and see your level,  the down side is these little levels are sitting right where the rail base screws are sitting so once you mount the rail you super glue the bubble in place it's not coming out unless you break the bubble vile unless Talley has improved the design anyway it's not a big deal Talley told me to give him a call if I ever needed to pull the Picatinny rail.    I will use a couple small levels  when needed along with a plumb bob I keep hanging off the dog run's or the fence,  i just sit in the garage and level the rifle on the shooting bench looking at the plumb bob and carefully turn the scope  until the reticle matches up with the plumb bob line on the fence, then lock it down.  I do agree use grid paper especially when checking scope tracking, normally I do this at  50 to 100 yds or so.

I would be tempted to shoot it !  cool rifle

Grizzly340 :   I saw that also on Hodgdons re-loading data center,  IMR 7828 and Winchester Supreme 780 Discontinued  while looking at load data.   I don't know what the deal is on IMR Enduron 8133  good powder not a lot of load data.

everyone has good points imo,  we are a dying breed the kids today can't even make change without an electronic  cash register do it for them,  so why would we expect the younger generations to have the same tastes than we do.