I am building a 378 weatherby on a No. 1 Tropical (28 inch barrel), and would like to add weight to the rifle for a total weight of around 11 lbs. For now, I will keep the original laminate stock.

How does one artfully add weight to a No. 1?

Most common method is adding lead to the stock. One method is to make plastic tubes up of various lenghts add shot til you get the wieght you want. Drill stock and insert. My problem isas I get older I'm going the other way, lighter and lighter. My No. 1 in 45-70 with heavy loads really is as much recoil as I want. Most practice is with lighter loads for offhand practice. Use the heavy loads last couple of weeks before the hunt.

I would think that a heavy barrel would get you up to 11 lbs. easy enough(or close to it)...I have a C.Sharps in 40-90SS that weighs 11.25 lbs with a 32" 1/2 oct. 1/2 round barrel...

Unlike the Sharps the Ruger #1 has a forearm hanger that limits barrel diameter. The "Tropical" barrel is about as large (in dia.) as you can go without major mods. But, a 28" round "Tropical" size barrel with minimal taper should add pound or so over the standard one.
Is your new 28" barrel already installed? If so then I guess adding weight to the buttstock is the only option.

Put a mercury tube in the draw bolt hole. A pound is pretty easy to add and the mercury does seem to help with the recoil more than just static weight. A tube in my 375 Holland #1 makes a world of difference, but I am a bit recoil sensitive.

Josh

What Josh A said!!

Rich
DRSS

Mercury or some bird shot (if you're worried about the environment . You can also mill out a trough in the forend & pour some shot in the trough & pour a little epoxy in to keep it there.
I like a little heavier gun too. Even my deer rifles, I like to be 8# or more. I carry one all day with no problems and they are much easier to shoot well; especially when you're fatigued from walking or climbing . I try to get my customers to get their Big bores (.375 & up) over 10# with scope & sling. They've ALWAYS thanked me for that advice.

My other gun is a 458 Lott No.1 - at 9.25 lbs, it is way too light for that cartridge. As I build my 378 weatherby (which many have said kicks harder & sharper than a 458 Lott), proper weight is a important issue as I have no intention of using a muzzle brake.

Thanks for all the advice, what a great group we have here!

Bray, I just had this exact discussion with Mr. Hagn about the appropriate weight of a single shot in 375 Holland or 9.3x74R. He recommended 10 lbs., ready to hunt. For me light weights are just too hard to shoot accurately.

Josh