If you have a coned bolt barrel and want to screw it into Remington Action, (assuming it's a 1 1/16 16 TPI), you have to chuck the barrel up and establish the counterbore for the nose of the Remington bolt.
Back when Stiller brought out his drop port, I bought one for my Rail Gun, which had a standard L/R Stiller Viper on it, with the 30 degree cone. I had several good barrels for the Rail, so I just machined them to where the Stiller Drop Port Bolt, ( which has a Remington style nose), would fit.
Now, you could machine the end of the barrel flat, resulting in a .100 short tenon. I don't think that is a good idea, as the thread is already kind of short. Plus, not sure how well it would feed.
Keep in mind, all of this does defeat the safety feature of the Three Rings Of Steel that is part of the Remington design.
Here is what the Coned Bolt Barrels of the Rail Gun Barrels looked like after machining them to accept a Remington style nose.
http://benchrest.com/attachment.php?attachmentid=21168&stc=1&d=1530539051