Anyone have information on converting the Discovery to .30 caliper? Valve mods will be require and probably convert to 13 ci bottle.
Discovery to .30 caliper
- Thread starter Jonah
- Start date
I have a Cothran 308 with a tj 1-20 twist barrel. It shoots 44.75 and 50 grain jsb very accurate. I swapped out the Cothran valve for a magnum air valve, bored the transfer port to .187. It shoots jsb 50 @ 900-930. Get 8-10 shots @3000 psi. (Cothran stainless tube). Cothran valve shoots them over 1100 FPS and no bell curve, so I swapped the valve to get a bell curve. 5 lb 65-90 lb rifle and a quick calve swap, same barrel, 190 ft lb slug shooter @ 3200 psi.
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