Wildcats and load data question?

[rockhound78]

Wondering, if you have a "wildcat" you are working on, can you extrapolate potential max loads for your cartridge by comparing powder capacities from your cartridge to another cartridge where there is load data for? Same caliber and lets assume everything forward of the case mouth are identical

Case in point, I am messing with a cartridge that has a powder capacity to the case mouth, of 1.7 grains less than the 6.5 grendel has of the same powder (ball powder). I there a formula available to figure out what might be a max. powder charge for different powders utilizing the weight difference? Something along the lines of square root of the weight of the powder capacity difference or ???

 

[Walt Krafft]

Not that I am aware of. Start low and work up with a ladder test.

 

[Mikemci]

Quickload predictive software.

 

[Tommie]

Not that I am aware of. Start low and work up with a ladder test.

This. And I’ll add: become very proficient in detecting pressure signs.

 

[dolek]

https://www.neconos.com/item/QuickLOADQuickTARGET-Ballistic-Prediction-Software-V3.9-3

 

[Fast14riot]

Or, you can ask around here, lots of very experienced wildcatters. Generally you can find starting data and suitable powders for whatever you're working on.

 

[dgeesaman]

Quickload predictive software.

I would only “start” with quick load calcs if I rechambered a particular barrel to the wildcat and had good data on that barrel, bullet, and powder from before.

Otherwise I would ladder up and collect data that can go into Quickload.

David

 

[rockhound78]

Thanks for the info.

Slowly working my way up, trying different powders.

 

[Walt Krafft]

Thanks for the info.

Slowly working my way up, trying different powders.

Start with the slowest powders first that you think might work. It is better to run out of case capacity and need to go to a faster powder than go over pressure and need to slow down.