300BlkTalk

I sorted a bunch of 22 Shorts by rim thickness and bullet seated depth. Does that count for loading? Yes it DOES...it's a Reloading room process. Love 22 short...first rifle I ever shot. I wrote this up in another thread, rifle was made about 1915 https://i1044.photobucket.com/albums/b446/dellet/Mo...

I sorted a bunch of 22 Shorts by rim thickness and bullet seated depth. Does that count for loading?

The the shiny round mark at 10 o'clock is from the ejector and the sharp edge around the pin strike, early pressure signs/over gassed. Gas port is too big, load is close to max. Confirm that with your gas port size of .125" and load being .2 grains from max listed. Could be as simple as a different ...

A long time ago Dolomite told me the best scope for subs is one with a reticle for 22LR. Since I’m shooting more 22’s lately and looking at more drops, his wisdom makes much more sense now than it did then.

On my "accurate" carbine length 300BLKs, the scope turrets are set to 0/0 for a 100yd supersonic zero. 50yd subsonic zero is at "8" on the elev turret, which is up 8 moa I guess. Interesting. My rifle is zeroed at 100 for supers, and 200 yd zero is 1 mil up. The 200 yd zero for subsonic is ~7.5 mil...

This will get you close. Take an unprimed sized case, insert a bulge and pull it. Ideally you want a .308” opening, but you won’t get that. Zero your caliper on the outside measurement of that case. What you want to do is invert that case on the loaded rounds and check length. The red thing is a com...

If it's within .005", it's probably not anything you are doing wrong( other than how you measure), it's the bullet. First sort some bullets by length and you will see some variation. Then you really should sort by measuring bullet base to ogive, that is the point on the bullet most seaters will push...

I would suspect chronograph error. What type was it?

If point of impact did not change significantly I would really question chronograph. At 50 yards I would expect around an inch low or more. At 100 more like 2-3 " low.

OK I'll try .005, that seems like a very minute change but I guess once you get much longer I might have to up the charge. That's all I wanted was some opinions on what other people have done. you really don't need to know any of that other stuff to give a simple answer. If you wanna just talk abou...

At what increments should I start lengthening my cartridge by to see a difference? . Sorry man no one can answer that question. Simply said it dosent Work like that across the board for anyone to answer definitively. As soon as some one would tell you “@ .005 off rifling you will see accuracy tight...