260 rem load development finial update

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03-12-2017, 08:04 PM
wjarrell

260 rem load development finial update

(My original thread is on this same page right now)

Savage 111
260 Rem Criterion Match chamber
24" lite varmint 1-8 twist
Boyds Pro Varmint

Load specs

Virgin Lapua brass
140 VLD
45.4 grains of H4831sc
CCI 200
.020 off the lands

Last outing shot 5 just over half an inch at 100 yards off a bipod so I loaded up some more to shoot through the chronograph today. Speed averaged 2690 with low es and my group was nice and tight again. Just the slightest tiniest bit of ejector swipe on some of my brass, primers aren't really flat and not a heavy bolt handle. Do you guys think I'm good to go?
(I don't think I'm over pressure because my velocity isn't super high)
03-12-2017, 10:36 PM
FW Conch

Sounds good to Me. I'm going to give Your recipe a try. ;-))
03-16-2017, 04:30 AM
s3silver

With the pressure details you gave I would shoot it if it gave consistent groups.
03-16-2017, 10:40 PM
wjarrell

Quote:

Originally Posted by s3silver

With the pressure details you gave I would shoot it if it gave consistent groups.

Thats what I'm gonna do for now.
03-18-2017, 01:56 PM
m12lrs

Quote:

Originally Posted by wjarrell

(My original thread is on this same page right now)

Savage 111
260 Rem Criterion Match chamber
24" lite varmint 1-8 twist
Boyds Pro Varmint

Load specs

Virgin Lapua brass
140 VLD
45.4 grains of H4831sc
CCI 200
.020 off the lands

Last outing shot 5 just over half an inch at 100 yards off a bipod so I loaded up some more to shoot through the chronograph today. Speed averaged 2690 with low es and my group was nice and tight again. Just the slightest tiniest bit of ejector swipe on some of my brass, primers aren't really flat and not a heavy bolt handle. Do you guys think I'm good to go?
(I don't think I'm over pressure because my velocity isn't super high)

I have always found the loads i find with virgin lapua brass don't work well after fireforming

I always run an expander mandrel through new lapua brass and then through my sizing die.

That brass comes very tight necked and that perfectly clean neck has a lot of neck tension.

That brass also comes small with the shoulder much shorter than SAAMI. If you measure the shoulder on new and fireformed brass it can grow as much as .012. Case volume is going to change.