There is no way of knowing without a much more detailed description of your Winchester model 70.Is it a pre-64 model or post 64 model.How much custom work has been done to your rifle?All this has a bearing on the value.Please repost your question with this info for a accurate value.
Custom proposition
1000-10000 usd
Yes.The Winchester model 70 classic custom grade rifle was chambered in .300 Weatherby Mag.This model was made from 1990-1994.The custom ultimate classic wcaliber as also available from 1995-2006 in this chambering.The model 70 Winlite was chambered in .300 Weatherby.This model was made from 1986-1990.The model 70 classic stainless BOSS was available from 1996-1997 in this caliber.The classic sporter BOSS was available in this caliber in 1996.The classic sporter III was chambered for this caliber from 1994-2000.The model 70 sporter was chambered in this from 1989-1994.This model was also marked XTR sporter in 1989.
Your description tells me that you have a custom rifle chambered in .300 Weatherby Magnum which was built on a 1903 Springfield action.The weatherby Cartridges did not come into being until the 1940,s and were only available in the Weatherby rifles of that time,It would be har to define a value for you because it is unknown how much work went into this rifle and the components used.If you can locate the gunsmith that made this rifle,i am sure he could tell you the amount spent to create it.
There does NOT appear to be any current major producers offering a lever action rifle/carbine chambered for the .41 Magnum cartridge. There may be some custom made guns, finding a custom rifle gunsmith will require internet research.
The Winchester model 23 custom with winchoke chokes were imported in 1987 only.
While there have been custom rifles built, or converted from 357 Magnum rifles, to the best of my knowledge, there is no maker producing a .327 Magnum rifle.
Any rifle chambered for that cartridge. Most will be custom made double rifles.
Numerous commercial and custom makers have made 8mm Mauser rifles in the last 100 years
C Only if it came from the custom shop
Various grades were offered. Standard, Custom, etc..
While not very common your winchester model 1894 rifle is chambered in a caliber that was seeing it,s swan song by the time 1913 was rolling by.These fine rifles made prior to world war I are some of the best winchester made.Your rifle could be worth a considerable amount if in fine condition and happens to have some custom features that were available during that time span.If your rifle has a full octagon barrel,or a half magazine,or special wood,then we are talking in excess of 1,000 dollars.Almost all rifles of this age and in good condition can only be found in winchester collections.If you have this rifle congratulations and enjoy a fine winchester rifle.