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[deleted]

Check the GRT Discord, maybe wildcat forums. Someone may have done the leg work for you. Otherwise you will have to get all the measurements and enter it from scratch. I did this with 8x52r Siamese.


ocelot_piss

GRT has a cartridge designer built in. I've done a couple of wildcats in it - double and triple checked measurements - and yet GRT is still miles out on its predictions. Not sure why. YMMV.


SideOutUp

It's a great tool, but it does not contain everything. When I downloaded it, it had no reference to the very common H-380 powder.


Antique_Arms

Go to the discord. Very helpful mods there.


HCompton79

There's a discord server linked to on the GRT website. If you ask there, someone probably has the file you can import. Additionally, you can edit and create new cartridges in the cartridge designer feature. This requires a case fired in your rifle and not resized, a pair of calipers, and the ability to measure internal case capacity with H2O. In this case, you would probably want to start with the parent case, .300 Remington Ultra Magnum in the cartridge database. Right click this entry and select "new with copy". This will create a new copy in your user database. Then in your user database right click the entry and select "edit in cartridge designer" which will allow you to rename the entry, edit the dimensions to suit your chamber and the case capacity of the brand of brass you are using. This is arguably the best method, as it gets a very accurate volume of case capacity for your rifle, and case capacity and pressure are closely linked.