/diy/ - Do It Yourself

>>1892072
>well how the fuck are they?
Mediocre.
>what load and what are you shooting them out of?
I tried VV N310 and N320, didn't create enough pressure though because the projectiles are too light. I've got some locally made powder though (TP103) which works great in these rifles (pic related). They're about a .75 cal.
>black powder? any burning?
No black powder, but smells and smokes like the stuff when fired. Guess the ABS is burning (smells vile), so I'm going to need some nitro cards or something.

>>1722994
You try finding reloadable 32mm long shells for a 12 gauge, practically impossible that is.

>>1499027
We shoot a few warming up shots (also to get rid of any excess storage oil/cleaning agents in the barrel), then zero the rifles to roughly 1mm at 20 meters (about 1/4 to 1/3 MOA).
These things have long barrels that aren't freefloated, so in theory they could warp the barrel during a heat cycle. However, the main difference between a hot and a cold chamber is the muzzle velocity, on a hot chamber you should be doing 210-220 m/s and cold chambers tend to start at 180. Less muzzle velocity means a more bullet drop, and every bit of accuracy is critical when you need your rifle to be this accurate.

A large part of it is between the shooter's ears though.

>>1462839
Because they want to be able to completely seal up the chamber and loading port, so they want to close the bolt. That leaves me with 4x1.5mm room to get a little flag out of the loading port if I close the bolt halfway on pic related. I tried a few units with regular PLA, but they keep snapping off - and then I found some PLAFlex leftovers which solved the problem. Main issue with standard chamber flags is that not only do they keep the loading port open, they also don't fit because these are niche target rifles in a custom 19x39mmR caliber.