6.5 PRC Lapua Brass

[Straightshooter1]

Just received a couple boxes of Lapua 6.5 PRC that I ordered from Whidden Gunworks last week (way cheaper than what can be got on Gunbroker). Now I just gotta get them precision tuned. To start, I've taken a bunch of measurements and thought I'd share:

Lapua Virgin Brass Measurements
Base Diameter: .528" - .529"
Above Web @ .200: .5295"
Shoulder Diameter: .511"
Neck Diameter: .292"
OAL: 2.020" (a few ranging up to 2.022)
Base to Shoulder Datum: 1.658" (very consistent)
Neck Thickness: .0147 - .0162"
Primer Pocket Depth: .122" (just a few a hair less by .0005)
Case Volume: 66.8 - 67.4 gr H2O (67.1 gr average)

Time to do some fire forming

 

[B23]

Just for comparison sake could you get a overall weight on a few pieces of that Lapua 6.5 PRC brass.

I've measured both ADG and Hornady 6.5 PRC brass for volume and overall weight and length on new unfired brass.

ADG 68-68.1gr H2O (empty weight 222.8 gr =/- .5 gr) case length 2.022

Hornady 68.7gr H2O (empty case weight 218.3 gr) case length 2.020

 

[Straightshooter1]

Just for comparison sake could you get a overall weight on a few pieces of that Lapua 6.5 PRC brass.

I've measured both ADG and Hornady 6.5 PRC brass for volume and overall weight and length on new unfired brass.

ADG 68-68.1gr H2O (empty weight 222.8 gr =/- .5 gr) case length 2.022

Hornady 68.7gr H2O (empty case weight 218.3 gr) case length 2.020

Lapua: 66.8-67.4 gr H2O (empty case weight 224.4 gr) case length 2.020

I've added the weight to the OP. Since it was virgin brass, I mistakenly thought it wasn't important include it as it's only a small sample and going to weight them all after firing forming to cull the outliers out of any significance and also get the volume of the brass after firing.

 

[Straightshooter1]

Ok, so today I fired 10 rounds of this Lapua Virgin brass to find what the measurements are after firing and chronoed them to see how my guess, with a little help from QuickLoad, for a powder load of MagPro would do. 61.0 grs pushing Berger 140 gr Hybrids gave me an average MV of 3,014 fps, SD: not bad @ 8.5 and ES: 24 with two 5 shot groups under .5" @100 yds. (RPR with 26" factory barrel; Ambient temp: 90°F; Humidity: 57%; Wind: 0-2 mph from 7) Now I need to find a good load and tune it.

Lapua Fired Brass Measurements
Base Diameter: .528"
Above Web @ .200: .5315"
Shoulder Diameter: .518"
Neck Diameter: .298"
OAL: 2.020"
Base to Shoulder Datum: 1.661" (all 10)
Case Volume: 68.4 - 68.8 gr H2O (68.6 gr average)
Case Weights: 224.0 - 225.6 (224.6 gr average)


Lapua Virgin Brass Measurements
Base Diameter: .528" - .529"
Above Web @ .200: .5295"
Shoulder Diameter: .511"
Neck Diameter: .292"
OAL: 2.020" (a few ranging up to 2.022)
Base to Shoulder Datum: 1.658" (very consistent)
Neck Thickness: .0147 - .0162"
Primer Pocket Depth: .122" (just a few a hair less by .0005)
Case Volume: 66.8 - 67.4 gr H2O (67.1 gr average)