16in50calNavalRifle
Member
- Joined
- Mar 7, 2009
- Messages
- 355
A situation that perhaps our M1 carbine gurus will diagnose easily - but which I find a bit puzzling.
Today I fired 30 test rounds of 30C - reloads all using new (unfired, anyway) LC brass, 14.8g of H110, and 3 brands of SR primers - Tula, Wolf, and CCI. All worked just fine. I wanted to see how the brass - untrimmed, but under 1.290 after resizing and expansion - and the various primers worked. I also wanted to see if a larger charge (I used 14.5g of H110 or a bit less in my first 30C reloads) brought the point of impact up a bit @ 50 and 100yds (it did).
Then for comparison, practice, and fun, I fired about 30 S&B factory rounds (before switching over to my Mosin Nagant to continue my epic struggle to determine whether I do in fact have to move the front sight about .001" to the right to center the hits @ 100yds - and to happily fire a Garand that the shooter next to me graciously offered to share).
Of those, about a third showed a distinctive dent in the case mouth when I recovered them. I hope the photos here show what I'm talking about.
Each and every LC case was fine (that is, no real distortions or dents to the case mouths). A few questions:
1) what would cause this dent in the case mouths?
2) why some, and not others?
3) why was the LC brass unaffected?
I know (well, I think I know) that the S&B factory might be a little under-powered compared to my reloads. But I can't come up with how that fact might cause 1/3 of the cases to be dented on extraction/ejection.
One more question - can I salvage these cases by bending the case mouths back out to (approx.) round, or do they go in the scrap can?
Footnote: the nearby Garand shooter, happily, didn't want his brass, so now I have a start on my stock of 30-06 cases to feed my recently arrived CMP 1955 HRA Service Grade M1, now undergoing stock cleaning. And there were also scads of .223 cases I happily scooped up to add to my can of that caliber, which I plan to clean and sell.
Today I fired 30 test rounds of 30C - reloads all using new (unfired, anyway) LC brass, 14.8g of H110, and 3 brands of SR primers - Tula, Wolf, and CCI. All worked just fine. I wanted to see how the brass - untrimmed, but under 1.290 after resizing and expansion - and the various primers worked. I also wanted to see if a larger charge (I used 14.5g of H110 or a bit less in my first 30C reloads) brought the point of impact up a bit @ 50 and 100yds (it did).
Then for comparison, practice, and fun, I fired about 30 S&B factory rounds (before switching over to my Mosin Nagant to continue my epic struggle to determine whether I do in fact have to move the front sight about .001" to the right to center the hits @ 100yds - and to happily fire a Garand that the shooter next to me graciously offered to share).
Of those, about a third showed a distinctive dent in the case mouth when I recovered them. I hope the photos here show what I'm talking about.
Each and every LC case was fine (that is, no real distortions or dents to the case mouths). A few questions:
1) what would cause this dent in the case mouths?
2) why some, and not others?
3) why was the LC brass unaffected?
I know (well, I think I know) that the S&B factory might be a little under-powered compared to my reloads. But I can't come up with how that fact might cause 1/3 of the cases to be dented on extraction/ejection.
One more question - can I salvage these cases by bending the case mouths back out to (approx.) round, or do they go in the scrap can?
Footnote: the nearby Garand shooter, happily, didn't want his brass, so now I have a start on my stock of 30-06 cases to feed my recently arrived CMP 1955 HRA Service Grade M1, now undergoing stock cleaning. And there were also scads of .223 cases I happily scooped up to add to my can of that caliber, which I plan to clean and sell.