308 brass volume starline vs Lapua

[Park ranger]

Does anyone know off hand if there is a significant volume difference between Lapua and Starline in 308? I know there is with Winchester and Lapua, needing about a 1/2 less powder with Lapua.

I did a quick test, both brands weighed pretty close to each other and I filled a case full of ball powder and poured one into another and it filled the case equally.

Have a match Sunday and don’t have enough brass prepped, so was thinking of switching brass (to starline). This load is for an AR10. 185 juggernaut with 43.5 of varget around 2550 fps.

Thanks. I might find time tomorrow to work up and confirm, but looking for a sanity check.

 

[Bill Norris]

Have not seen it in .308 but with the 260 Lapua & 260 Starline my loads are interchangeable with no issues.

 

[alphapygmy]

I've recently bought both Lapua and Starline. Fired volumes were 56.1 for Lapua and 56.3 for the Starline. YMMV depending on lot #'s and such.

 

[Park ranger]

Ok, for posterity starline seems to be the same as Lapua in my quick test. I dropped it .2 of a grain, and it was just a touch slower.

 

[Park ranger]

 

[Kracken McGraw]

View attachment 1442867

Was the Starline small rifle primer?
I just got the small in 6.5 Creedmoor for a little more diversification with primer choices and I like the looks of it.

 

[Straightshooter1]

Does anyone know off hand if there is a significant volume difference between Lapua and Starline in 308? I know there is with Winchester and Lapua, needing about a 1/2 less powder with Lapua.

I did a quick test, both brands weighed pretty close to each other and I filled a case full of ball powder and poured one into another and it filled the case equally.

Have a match Sunday and don’t have enough brass prepped, so was thinking of switching brass (to starline). This load is for an AR10. 185 juggernaut with 43.5 of varget around 2550 fps.

Thanks. I might find time tomorrow to work up and confirm, but looking for a sanity check.

For competition, it's always a good idea to take your own volume measurements of any new lots of brass you acquire as even within the same brand of brass there can be a significant difference from lot to lot, let alone from one brand vs another.

The last .308 Starline brass I measure gave me an average volume of 54.6 gr H2O compared to my Lapua brass having 55.9 grs H2O. I wouldn't expect this particular difference to hold true your Lapua and Starline brass. But is should show that taking measurements for competition would be an important step in your brass pre. These measurements are from fired/unsized cases and I'd also think the volume measurement this way will vary depending on chamber specs that the cases were fired in.

 

[Park ranger]

Was the Starline small rifle primer?
I just got the small in 6.5 Creedmoor for a little more diversification with primer choices and I like the looks of it.

No, it was the LRP stuff. Who knew when I bought it that LR primers would be nonexistent

 

[Kracken McGraw]

No, it was the LRP stuff. Who knew when I bought it that LR primers would be nonexistent

I know, and I really don’t know why.