Too much pressure, or right at the edge?

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April 17th, 2015
Dale Gribble

Too much pressure, or right at the edge?

https://lh3.googleusercontent.com/-c...2016.10.50.jpg
April 17th, 2015
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
April 17th, 2015
NJC

educate me.. what is the indicator of pressure we are looking for here.
April 17th, 2015
Dale Gribble

Quote:

Originally Posted by 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

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.
April 17th, 2015
Dale Gribble

Quote:

Originally Posted by NJC

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.
April 17th, 2015
FLT

You're good Dale . That should be pushing close to 1400 FPS.
April 17th, 2015
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/-y...2018.21.12.jpg
April 17th, 2015
Dale Gribble

Thanks FLT and Rumbler.
April 17th, 2015
Johnny

You need to be able to see the radius on the outer edge off the primer.
April 17th, 2015
Cattle/Horses

1 Attachment(s)

Googled and found this pic.

Attachment 5057

Normal, high pressure, excessive pressure
April 17th, 2015
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?
April 17th, 2015
Dale Gribble

Quote:

Originally Posted by 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?

Any lower and it doesn't cycle.
April 17th, 2015
Frady

You say you increased the COAL and saw higher pressure signs? No change in powder?
April 17th, 2015
Dale Gribble

Quote:

Originally Posted by Frady

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

Yes. Went from 2.15 to 2.24
April 17th, 2015
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.
April 17th, 2015
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.
April 17th, 2015
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.
April 17th, 2015
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.
April 19th, 2015
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.
May 13th, 2015
Dale Gribble

Quote:

Originally Posted by FLT

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.