Thread: 6.5 Creedmoor Loads for 1:8 Twist?

Originally Posted by johnd

Be aware that Lapua small rifle primer brass isnt going to show a lot of pressure signs as per the norm. I believe it lets people pump up the volume way above the book maximum, without the usuall tell tale signs.

@johnd Would be good to know where that is discussed please.

Havent read it that I recall, its just an impression I have got. From reading different articles in other forums .... nothing concrete.
One of the reasons that people wanted SP brass such as Lapua and Starline was so that it would have a longer life, and that means that it should not respond to high pressure by enlarging pockets.
Enlarged primer pockets is therefore a sign of high pressure, that isnt going to show up in SP brass.
Another benefit of SP brass is that it will now also have a thicker base so it wont expand as much and this will mask what would normally be stiff bolt lift.
As the primer has a smaller comparative area it is also less likely to show things like gas leak and primer flow.

All of these signs of excessive pressure will still happen, just at a higher level than what the reloader is used to when using "normal" brass

This is all pure conjecture on my part. Make of it what you will.

Check out rifleshooter.com heaps of info there, guys are getting really good speed in 20" barrels with 142/143 gr and RL17

Originally Posted by 300_BLK

Check out rifleshooter.com heaps of info there, guys are getting really good speed in 20" barrels with 142/143 gr and RL17

Yeah I’ve been keeping tabs on that too, the RL17 is getting good support.. Really don’t want to have to change powder, 2209 covers .243 and 6.5CM, but might have to.

140g ELD Match, 41.5gns 2209, Hornady brass trimmed to 1.915, Federal 210M primer, 2.815 COAL
1/2 MOA load

The original Hornady ammo had load data on the box.

Here is a link with the data, this stuff shoots 3/8 MOA in my old man's Howa heavy barrel.

http://www.65creedmoor.com/index.php?topic=6961.0

Pretty good article on pressure signs, specifically using 6.5 Creedmoor as the test case.

https://www.primalrights.com/library...nding-pressure

48gr of AR2209 eventually induced failure

That case at 48 grains looks pretty, such a work of art displayed by the bolt face