diagnosing cases

skizzums · October 27, 2014, 12:24 AM

hello everyone. I was trying to work p some loads for which I had no data for. I had data for a totally differen style of bullet which was ten gr heavier and worked of that. I was trying to find out where my max would be, looking for flattened primers. I am using 100gr Lapua 100gr Cutting Edge HP's .308 in 300BLK with Lil' Gun. My loads are from 18.5gr to 20gr, half grain in between. so I am seeing to little teeth marks around the mouth of the higher load ones, starts to disappear as I get to the lower loads. you can see two pronounced marks on the 20gr and 19.5, and 1 mark on the 19.0 and none on the 18.5. the max for a 110 vmax bullet is 20.0gr, I assumed that with this being such a smaller bullet, I would have a little more leeway, but maybe I am wrong are these marks something to be concerned about, does it mean I need to stay under the 19.0gr? thanks, i have never seen extractor marks before, but really have only used sub-sonic ammunition except for a couple loads which stayed way under max

the / is 19.5, the X is 20.0

left is 18.5 and right is 19.0

primers all look good to me

T. O'Heir · October 27, 2014, 04:11 PM

Please reduce the size of your pictures.
I don't see any 'little teeth marks" anywhere. There is no huge picture of the case mouths either. Not something to worry about anyway.

skizzums · October 27, 2014, 11:33 PM

I don't know how to reduce the size of a picture from photobucket. and they don't give enough file size to ust upload pics anymore. you can see two deep dents on the bottleneck just under the case mouths. just wondering because ive never seen them before.

10-96 · October 28, 2014, 04:19 AM

I don't think those little marks have any appreciable role to play in your recipes. However, if you want them to go away give this a whirl: Cut your ejector spring so that only two coils stick out over the top of the bolt lug rim. I don't know why but every ejector spring I've ever seen has been insanely longer than it needs to be. When you go to reassemble, put the cut end first into the hole and leave the ground flattened end on top.

I don't think those little marks will hurt anything, but tuning the ejector spring ought to make them go away. What it looks like is that the ejector (on the left side of boltface) is pushing the right side of the ejecting case into locking lug corners as it clears the chamber area.

October 27, 2014, 12:24 AM	#1
skizzums Senior Member Join Date: July 1, 2013 Location: Douglasville, Ga Posts: 4,615	diagnosing cases hello everyone. I was trying to work p some loads for which I had no data for. I had data for a totally differen style of bullet which was ten gr heavier and worked of that. I was trying to find out where my max would be, looking for flattened primers. I am using 100gr Lapua 100gr Cutting Edge HP's .308 in 300BLK with Lil' Gun. My loads are from 18.5gr to 20gr, half grain in between. so I am seeing to little teeth marks around the mouth of the higher load ones, starts to disappear as I get to the lower loads. you can see two pronounced marks on the 20gr and 19.5, and 1 mark on the 19.0 and none on the 18.5. the max for a 110 vmax bullet is 20.0gr, I assumed that with this being such a smaller bullet, I would have a little more leeway, but maybe I am wrong are these marks something to be concerned about, does it mean I need to stay under the 19.0gr? thanks, i have never seen extractor marks before, but really have only used sub-sonic ammunition except for a couple loads which stayed way under max the / is 19.5, the X is 20.0 left is 18.5 and right is 19.0 primers all look good to me

October 28, 2014, 04:19 AM	#4
10-96 Senior Member Join Date: October 19, 2005 Location: Tx Panhandle Territory Posts: 4,190	I don't think those little marks have any appreciable role to play in your recipes. However, if you want them to go away give this a whirl: Cut your ejector spring so that only two coils stick out over the top of the bolt lug rim. I don't know why but every ejector spring I've ever seen has been insanely longer than it needs to be. When you go to reassemble, put the cut end first into the hole and leave the ground flattened end on top. I don't think those little marks will hurt anything, but tuning the ejector spring ought to make them go away. What it looks like is that the ejector (on the left side of boltface) is pushing the right side of the ejecting case into locking lug corners as it clears the chamber area. __________________ Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day) I suspect a thing or two... because I've seen a thing or two.

October 27, 2014, 04:11 PM	#2
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	Please reduce the size of your pictures. I don't see any 'little teeth marks" anywhere. There is no huge picture of the case mouths either. Not something to worry about anyway.

October 27, 2014, 11:33 PM	#3
skizzums Senior Member Join Date: July 1, 2013 Location: Douglasville, Ga Posts: 4,615	I don't know how to reduce the size of a picture from photobucket. and they don't give enough file size to ust upload pics anymore. you can see two deep dents on the bottleneck just under the case mouths. just wondering because ive never seen them before.