338 Lapua virgin brass

[338edge]

Here's my question. Has anyone noticed virgin brass out shooting once fired brass? Here's my rundown.
-338 Lapua accumark wby, bedded, trigger job
-lapua brass
-300 gr berger bullets
-atacr nightforce scope
-88.5 grs of H-1000
- velocity with virgin brass=2600, accuracy = one hole to 3/8 @ 100 yards 3 shots. Verified out to 840 yards with a .5 group. Es spreads of 2 sd of 1
-velocity with 1 fired brass = 2650. Accuracy = really close to the virgin brass but not quite as tight. Verified out to 840 yards. Accuracy .6 Es spread of 20 sd of 13

I'm using a redding full length bushing die with a 367 bushing,comp seater die. I just ordered the 363 bushing. I'm trying copy the neck tension of the virgin brass as that was the best accuracy lowest es spreads and a very low so . I think the more neck tension of the virgin brass caused the powder to burn more effectively.

Thanks, Corey

 

[4xforfun]

Wow..jumping from a .367 bushing to a .363!!! I'll bet the brass will measure .361 after you run it through the .363 bushing. Big jump!!

 

[Frank in the Laurels]

I would think that much would cause a major pressure upgrade...how's the primers look ? How's the bolt lift ? Brass growing much longer than before ? Case life comparable to before ? Too bad we all don't have a simple pressure measuring device..

 

[338edge]

Wow..jumping from a .367 bushing to a .363!!! I'll bet the brass will measure .361 after you run it through the .363 bushing. Big jump!!

The redding tec Don was his name said you will get some spring back so try the 363.

 

[338edge]

I would think that much would cause a major pressure upgrade...how's the primers look ? How's the bolt lift ? Brass growing much longer than before ? Case life comparable to before ? Too bad we all don't have a simple pressure measuring device..

No to all the above. Primers look great. No pressure signs of any kind. In all the rifles I have loaded for virgin brass rules? My buddies and mine with custom barrels the same thing? We're not talking a lot of measurable differences in accuracy but some none the least.

 

[4xforfun]

The redding tec Don was his name said you will get some spring back so try the 363.

It is very common for the brass to end up SMALLER then the bushing size. Doesn't sound possible, but, if you are squeezing the brass a bunch, it will probably happen.

Split necks. | Shooters' Forum

Start at post 23.

Tod

 

[TXAoudadKlr]

Not that it matters to anyone else but what's your barrel length?