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Building 510 whisper/338 lapau need advice

Bigchaza

Sergeant
Full Member
Minuteman
May 7, 2012
156
0
34
AUS NSW
Looking to build a 510whisper/338 lapau switch barrel few questions about the calibres
with the 510 just trying to make a bowling ball launcher for quiet subsonic hog hunting. As for the 338 lapau just using it for target and some long range hunting

I really wanted to shoot cast 1250 gr bullets subsonic out of the 510 whisper, can they move pellets this big to 1050 fps? really whats the biggest heaviest slug I can put in this thing?

who makes quality bullet moulds custom?

what twist rate do 510 whispers use for their heavier pellets?

what profile of barrel do both of these calibre's need without going overboard on the weight?
doing 18 inch long for 510 whisper and 28 inch for 338 lapau