CAST in a gas gun?? Your #### Will Fall Off!!
Or that's about what a gunsmith in a small shop told me a little bit ago. Leading of the gas port, blown up rifle, etc etc....
A good few hundred rounds of nothing but cast and I just finished tearing my rifle down to de-coke the gas system, and wtf? No lead? Not even a scrap? I must be doing something wrong, since my ####'s still properly indexed and headspace is good.
Anyway, I've been doing load development for a few months and I've gotten some good results, but consistency is a bit elusive.
Here's my data so far.
RCBS 165 silhouette bullet of #2 alloy or thereabouts, sized to .311 (in reality it's probably .310 for as much as the sizing die touches it unevenly about its circumference), crimped ahead of the first driving band in order to keep the ogive from engraving on the rifling upon chambering.
I've tried the following
2400 15-19gr. Very fine accuracy, but will not fully cycle the action (too fast a powder, but I had to try it once)
RL7 Needs further testing, but the 26-28gr range seems promising.
H4895 this one is hot and cold for me. One string will be lovely, the next will be scattered, and vice versa. Anyway, 30.5 +\- 1gr seems to be orbiting the sweet spot
H335 30gr +\- 1gr is again orbiting the sweet spot.
AA5744 - 20-25gr tested. Results not terribly promising, but I may re-test later. Best group was 23gr
Next weekend I hope to reexamine reloader 7 and H335. Just got my test loads done up tonight. I've not had a chance to shoot the thing more than once since installing an SA flash hider and match front sight. So far the only difference that seems to have made (other than the better sight picture) is that my rear sight is cranked all the way down and I still shoot high at the 75 metres that I've been testing at.
I've just added one more shim tonight as well, making my gas lock plastic-hammer-tight. The rifle is as tight as I can make it with hammer and locktite now, so perhaps consistency will follow.