Golf Ball Mortar Chamber Capacity

[The Jeff]

I'm currently working on a 10" seacoast mortar in golf ball bore and I'm wondering how much powder would be appropriate for steel Fox balls. I've scoured past posts for any hard data and it seems like ~40 grains Fg will get a golf ball ~100 yards. How much would it take to get a Fox ball to 100?
Thanks!

[Double D]

If you are scaling down just scale the chamber also and use what you have.

Currently I am making my golf mortars with a 3/4 diameter chamber, 3/4 deep.

Look at this post.  http://www.gboreloaded.com/forums/index.php/topic,236727.msg1099338916.html#msg1099338916

I needed 95 grais for 100 yard shots.

Now take a look at this post on poor ignition of GB mortar charges.  http://www.gboreloaded.com/forums/index.php/topic,127789.msg1098461343.html#msg1098461343

[The Jeff]

I thought I did a pretty exhaustive search, but I missed your first link. That's exactly what I was looking for! Based on your tests I'm thinking 100 grain capacity should give me a 100 yard range with steel balls. Especially since I can change the elevation of the mortar.


About the powder chamber design, from what I've read it seems like a long and narrow is more efficient and reliable than a short, squat one. Having the vent inside the powder column is probably the most important though.