finding max velocity / 6.5 x 284

[TackDriv3r]

Loaded up 11 rounds with 143 ELDX, each round stepped up in .3 increments from 48.5 to 52.5 grains with virgin brass since I have to fireform it anyway. 52.5 grains shows 2870 fps, no pressure signs or heavy bolt lift. The last 3 rounds, 51.7, 52.1 and 52.5 seems to be close to POI and on a plane., the rest of the others are all over the map. Check the primers out from left to right ( 48.5 - 52.5 grains ), seems rounded on edges. Should I try # 8 to # 11, 3 round in increments of .3 grains? Or do I still have more room? Of course fireformed brass will give better results, but still have roughly 60 pieces virgin brass to fireform.

 

[Bc'z]

Personally I'd build a load on the virgin brass, and adjust charge weight after brass is all 1x fired.

 

[Walt Krafft]

You don't say how long your barrel is, but I got much higher velocity, around 3000fps, shooting H4350 and 142 Sierras out of a 30 inch tube.

 

[J.d. Popkes]

Are ya looking for max, like the title says or looking for a velocity node? Those are straight 260 speeds.

 

[okie]

try H-4350

 

[TackDriv3r]

You don't say how long your barrel is, but I got much higher velocity, around 3000fps, shooting H4350 and 142 Sierras out of a 30 inch tube.

Sorry, its 26 inch Bartlein.

 

[TackDriv3r]

Are ya looking for max, like the title says or looking for a velocity node? Those are straight 260 speeds.

With H4831SC, no other powder.

 

[J.d. Popkes]

With H4831SC, no other powder.

If it were me I’d run it up to pressure over your chronograph, then you’d know your max. I’d be surprised if you can’t hit 3k. But that’s for you to decide and test.