ex_reven wrote:Is there any particular reason you are pursuing a max load for your particular firearm?
Jack V wrote:Leaving a max pressure round in the chamber of a hot barrel while you wait for a shot can pop primers and give hard bolt lift or worse
ex_reven wrote:On that note, if you are seeking accuracy - it does not necessarily lie in the hottest/fastest load.
Your rifle will have accuracy 'nodes' that occur at certain velocities. You can have several different velocities around which you will experience a marked increase in accuracy/consistency. If you run a ladder test, you can identify where these 'nodes' lie and can then do further load development around these nodes until you work up a load that suits the purpose of the firearm.
Jack V wrote:Yes absolutely correct. Even with ADI powders some pressure increase will still happen as the powder heats up . Loads developed in winter at max can start causing trouble in Summer . Leaving a max pressure round in the chamber of a hot barrel while you wait for a shot can pop primers and give hard bolt lift or worse . Leaving said rounds in the sun or a hot vehicle can also have the same effect .
There is a few very good reasons why powder companies have recommended safe loads on the lighter side and then a stated max .
Noisydad wrote:An old military snipers trick to get a little more velocity for long rang shots is to sit cartridges in the sun to heat up.
Jack V wrote:Yes absolutely correct. Even with ADI powders some pressure increase will still happen as the powder heats up
wayward wrote:"pop primers"
You mean firing the round?
Or it bursts on itself without firing you mean?
upup wrote:ADI do the one for Aussie Outback ammo which isn't so effected by temperature don't they?
Can't remember which one, do you recall by any chance? Just curious.
upup wrote:ADI do the one for Aussie Outback ammo which isn't so effected by temperature don't they?
Can't remember which one, do you recall by any chance? Just curious.
sbd3927 wrote:Yes, but the powder used in the Outback ammo isn't available for purchase . A friend asked a contact at ADI about it. "Variants of 2208 and Benchmark series"
headspace wrote:My 308 with Winchester brass is using 45.5gn of 2208 behind a 165gn Hornady Interlock. It shoots extremely well and has been chronographed at an average 2,740fps over 5 rounds. No complaints from either me or the rifle.
JD
sbd3927 wrote:Good to know, I haven't tested past 44.6 yet. 44.3 was 2.5" above crosshairs,, 44.6 has come back down to 1" From your data might be worth poking a bit higher, no pressure signs, just soft federal primers flattening same as factory round.