U might benefit from trying to contact Istvan Fellegi,Miskolo,Hungary.
Since they manufacture 14.5B chambered rifle
(Destroyer Heavy Sniping Rifle)
Their ammo is loaded with 994grain tungsten carbide core ball that leaves barrel of unspecified length at awesome 3280fps.
It should penetrate 16mm of rolled armor steel at 1000m range. Price is propably quite horrifying despite the country of manufacture.
Same house makes modell called Gepard HSR
in 12,7X108 which is single shot while the Destroyer is semiauto.
Latter rifle shoots aprox. 12"@660yards with standard military ball (that is designed to disperse a bit for A-A use).
It should penetrate 30mmarmor @100m and [email protected]
I hope this helped http://22.214.171.124/NonCGI/smile.gif
Gattling = http://126.96.36.199/NonCGI/wink.gif