I’ve seen many ask how switching from Hornady (LRP) 6.5 Creedmoor brass to Lapua (SRP) brass affects the powder charge needed to find the node in an already developed load.
My findings:
• I reduced powder charge 1.1 grain from my good Hornady brass charge and worked up in .2 grain increments from there.
• In four different loads I had developed in Hornady brass with three different bullets and two different powders, a reduction of .7 grains from my Hornady charge was where the sweet spot was.
• One bullet that was mediocre accuracy wise in the Hornady brass really tightened up in the Lapua srp brass.
• The other three loads were already pretty good and stayed about the same accuracy wise.
All loads with Hornady brass/Fed 210M primers and Lapua brass/Fed 205M primers:
• 136 Lapua Scenar-L
Hornady - 41.6 H4350
Lapua - 40.9 H4350
Hornady - 44.1 N555
Lapua 43.4 N555
• 139 Lapua Scenar/H4350
H- 41.6
L - 40.9
142 Sierra Matchking/H4350
H - 41.0
L - 40.3
* This was in my gun. Yours may be different. Start low within published data and work up. Turn around, don’t drown. Don’t run with scissors.
Anyway, in case it helps someone else, this was my experience switching between the two.
My findings:
• I reduced powder charge 1.1 grain from my good Hornady brass charge and worked up in .2 grain increments from there.
• In four different loads I had developed in Hornady brass with three different bullets and two different powders, a reduction of .7 grains from my Hornady charge was where the sweet spot was.
• One bullet that was mediocre accuracy wise in the Hornady brass really tightened up in the Lapua srp brass.
• The other three loads were already pretty good and stayed about the same accuracy wise.
All loads with Hornady brass/Fed 210M primers and Lapua brass/Fed 205M primers:
• 136 Lapua Scenar-L
Hornady - 41.6 H4350
Lapua - 40.9 H4350
Hornady - 44.1 N555
Lapua 43.4 N555
• 139 Lapua Scenar/H4350
H- 41.6
L - 40.9
142 Sierra Matchking/H4350
H - 41.0
L - 40.3
* This was in my gun. Yours may be different. Start low within published data and work up. Turn around, don’t drown. Don’t run with scissors.
Anyway, in case it helps someone else, this was my experience switching between the two.
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