I am in the process of designing a bullet for a 30 cal breech seated wildcat and cannot decide on the configuration of the nose. The specs will be sent to Accurate, so it will have a 0.18" meplat. I like the looks of a nose with a radius, but am aware of the success of the truncated cone. Examples being the Eagan MX-4 30 ARD and it copies. I was wondering if the truncated cone is successful because there is less mass in the unsupported nose. How about BC? They seem to do OK at distance. Any comments?
The Truncated Cone
- 239 Views
- Last Post 26 May 2020
- Topic Is Solved
IMHO, it is shock wave over the nose, and airflow subsonic. Supersonic it should not make a difference. Subsonic, airflow over the radius nose will provide more stability. The question is, will your bullet ever drop into the transonic range at the distances you shoot?
I shoot the Mx4 30ard in my 308x1.625 at 2020fps. The mold is an original Eagan. That's 30grn Varget(my load-my risk). It does well cast in linotype. The 14 twist in my rifle is the limiting factor.
What is your cartridge dimensions? I won't steal it.(well maybe) Are you going to have a tapered ,long, throat like the Ardito designs?
Ross-The cartridge is a 300Whisp-R Improved. A Mike Bellm/David White concoction. See "Shooting A Wimp" in TFS#254. Feel free to steal it. At present I am shooting a 200 grain bullet at around 1250 fps, so I am sure it goes subsonic at at some point. Racin-Yakima comment concerning stability at subsonic velocities was just the information I was looking for. I am going for a nose with a radius. Thanks guys.
- All Categories
- General Polls
- Contact Us w/ Forum Issues
- Welcome to The Cast Bullet Association Forum
- Bullet Casting
Guns & Shooting
- AR Platform
- TC Contenders & Other Single Shot Handguns
- Informal Matches & Other Shooting Events
- Gunsmithing Tips
- Gun Cleaning & Maintenance
- Benchrest Cast Bullet Shooting
- Military Bench Rest Cast Bullet Shooting
- Silhouette Shooting
- Postal Match Cast Bullet Shooting
- Factory Guns
- Black Powder Cartridge
- Hand Guns
- Lever Guns
- Single Shot Rifles
- Bolt Action Rifles
- Military Surplus Rifles
- Plinkers Hollow
- Buy, Sell or Trade
- Other Information & Reference