Thread: Slow Powder, Heavy GC boolit, anyone got a ballistics calculator?

Hi, looking for some help. Have not got a chrony but just want it to work safely.

Calibre .303 British, different no 1 Mk iiis and a No 4
All full length 24-25" barrels
204grain HP GC boolits from @shooternz
Federal 210 Large Rifle Primers
Case full to rear of bullet but not compressed, H414, 47grains charge is max it will hold that way.
Use: paper targets, deer, goats.

Reason for 414 is wanting to keep pressures low, both for safety and because shooting soft lead GC boolits and some of the barrels are more worn than others, hence going for a more gentle shove. Not too worried about pedestrian performance of H414 for reasons above, just definitely want to avoid going over 2000fps.

Anyone happy to put this in a ballistics calculator for a ballpark figure of muzzle velocity?