new to me Extreme .457

[mackeral5]

A bit of progress was made with the 3000psi tune.  After whittling a spare hammer down to <120grams, reducing hammer travel by .75", and reducing hammer-induced valve lift by .25" I finally have a decent string.  4 shots of 220gr BBT hollow points go 925, 950, 920, 880fps.  I really have nothing to compare that to but it seems to be a decent 3000psi .457 tune. 

The 3000psi tune mods are totally reversible as I have an unmolested spare hammer and the OEM heavy spring.  Some time soon I will put the heavy hammer and spring back in to see what the 32" barrel will do with 4500psi.

[mackeral5]

I couldn't resist the urge to find out what a 4500psi fill and the 32" barrel would do. 

NSA 302gr 3 shots 980, 921, 846fps

I have a 390 gr mold, perhaps I will cast some over the weekend and see how it does when lugged down a bit.

[mackeral5]

I casted up around 50 or so of an NOE mold 460-396-RF-AE2.  Using the hollowpoint pins these are dropping around 368-370gr.

3 shots at 4500psi using the OEM hammer and spring.  I can tighten this up through tweaking hammer travel and limiting valve lift, but this is at least a baseline. 

913, 851,735fps

[Back_Roads]

 That is keeping up with my Piledriver .510 with similar weight slugs.