reloading 101 help needed

[will36]

I know just enuff to blow myself up, so Im asking here.

I would like to reload some subsonic 7.62x39 rounds. This will be shot from my H&R. It has a .311 barrel.dia .

Can I used 180 grain siera boat tail hunter 303 bullets (312 dia) set them deeper to get correct length?

I was planning on using trail boss powder 10 grain to start with and bump it up until it becomes super sonic and back it up.

I am also wanting to use magnum primers with the primer hole opened up a little.

Now , will this bullet stabilize at 1050 fps with a 16.5 length barrel and a 1-10 twist?

What about bullet effectiveness for a clean kill ? (30 to 50 yards)
Guess what Im asking here is will it mushroom at that speed?

ANY HELP will be welcome.

 

[LongRange]

180gr, using 6.5gr of IMR SR7625 can probably go to 7gr and still keep it under SOS. I know a cpl guys and thats the load they run for their supressed x39's

 

[will36]

180gr, using 6.5gr of IMR SR7625 can probably go to 7gr and still keep it under SOS. I know a cpl guys and thats the load they run for their supressed x39's

so can I use the 303 bullets?

 

[3wbdriver]

so can I use the 303 bullets?

Yes. The .303 and Comblock 7.62 use the same size bullet (.311 - .312)

 

[dzelenka]

You need to check what twist rate your barrel is. It may very well not stabilize a 180 gr bullet.

 

[will36]

You need to check what twist rate your barrel is. It may very well not stabilize a 180 gr bullet.

16.5 inch 1 and 10 twist.

 

[dzelenka]

A 10 twist should stabilize a 180 (an 8 would be better).

Good luck. Don't blow yourself up.

 

[will36]

Thanks for the info. The plan is start @ 10 grains of trail boss and bump it up until it becomes super sonic and back it back down.