Too much pressure, or right at the edge?

[Dale Gribble]

https://lh3.googleusercontent.com/-cDrMMcmSdx4/VTF2ABTCsoI/AAAAAAAAJo4/mge5Pi_hl7g/s800/2015-04-17%252016.10.50.jpg

[Rumbler]

I'd read that as "safe". You still have some room to go, but it's not a "medium" load.


But you know how my tendencies. :p

[NJC]

educate me.. what is the indicator of pressure we are looking for here.

[Dale Gribble]

I'd read that as "safe". You still have some room to go, but it's not a "medium" load.


But you know how my tendencies. :p

That is 11gr of lil gun, pushing a 208 gr amax. Hits steel with authority. The shards off the bullet are knocking leaves and small branches off the tree.

[Dale Gribble]

educate me.. what is the indicator of pressure we are looking for here.

The round edges of the primer start flattening, and you don't see a gap between the primer and the brass, for one.

[FLT]

You're good Dale . That should be pushing close to 1400 FPS.

[Dale Gribble]

Slightly longer COAL, more pressure. Gotta back either the COAL down a little or reduce powder a little.

Or use harder primers? These are regular SR primers, not Nato spec.

https://lh3.googleusercontent.com/-y7_qWfS0jyQ/VTGIDPaaLZI/AAAAAAAAJpI/kaXtyF9c6ik/s9999/2015-04-17%252018.21.12.jpg

[Dale Gribble]

Thanks FLT and Rumbler.

[Johnny]

You need to be able to see the radius on the outer edge off the primer.

[Cattle/Horses]

Googled and found this pic.

5057

Normal, high pressure, excessive pressure

[Jas8340]

I agree with Rumbler, probably somewhere in the med-high range. Good to go. Are you going to work that down to a sub load?

[Dale Gribble]

I agree with Rumbler, probably somewhere in the med-high range. Good to go. Are you going to work that down to a sub load?

Any lower and it doesn't cycle.

[Frady]

You say you increased the COAL and saw higher pressure signs? No change in powder?

[Dale Gribble]

You say you increased the COAL and saw higher pressure signs? No change in powder?

Yes. Went from 2.15 to 2.24

[FLT]

Dale for what It's worth. The only powder that functions subsonic semi auto / locks the bolt on the last shot for me is A1680 . I get close with H110 but can't get the bolt to lock back on the last shot every time. Also the three rifles I work with do better with metal magazines. I'm not sure why that is but I've tried several of both kinds with the same results.

[Jas8340]

I've been using IMR-4227 for my sub loads. I haven't chronographed the loads yet, but 10.1 gr under that same bullet seems to be subsonic.

[Dale Gribble]

Lil Gun is what I have, so till I find other powders at a non-rape price, I'm a one trick pony.

[FLT]

Understood. Finding the powder of choice at any price is difficult at best. Lil gun is a pretty versatile powder hopefully you'll be able to find a compromise that works.

[marcus6176]

Dale you could use IMR 4198 is a good sub powder too. If you want some A1680, I have about little over a pound of it that will last you a life time. Just let me know.

[Dale Gribble]

You're good Dale . That should be pushing close to 1400 FPS.

You are amazing. It was something like 1350..

BTW, these things hit with authority.