Shoulder Bump. How much?

[demolitionman]

How many thousandths are you guys bump'n your shoulders (at datum) on loads specific to one particular bolt rifle? I'm having a bit of headspace problem with a gun and I'm trying to chase down the cause. Rifle is a .243 savage w/ CBI 26" 1/8. I'm getting an ever so slight bulge on one side of the web above the case head measuring about .247/.248 after firing. The case head is showing a slight bright ring as well but I oh on one side. Loads have been 38, 39, 39.5 and 40 gr h4350 and 105amax. Case looks about the same with all loads. It appears to be working the hell out of my brass. Die is an RCBS. My measurements show I've been bump'n about 4/1000ths on these loads.

You think 4/1000th bump could be the culprit for my case web bulge? My 6.5 cm is perfect after 6 loads and I'm bump'n it 2 to 3/1000ths.

 

[demolitionman]

Barrell has .002 headspace off a Clymers gauge using cut feeler gauge.

 

[turbo54]

That *slight* bulge is normal.

It isn't a headspace issue.

.001-.003" bump is just fine.

 

[remaction]

It sounds like it could be a chamber issue or the bolt head is not square to the chamber. Is this a new gun to you or an older gun that you have never had problems with before? I just set shoulders back .001". Just enough so that you can just feel some resistance or camming when closing the bolt on a sized casing (with the firing pin assembly removed).

 

[gixxer822]

try neck sizing. I ran into issues FL sizing for my 700 so I went to a redding neck die and problems gone until its hard to chamber. then I fl size. for a bolt .001-.002. gas .003-.004. ive gotten tht info from dudes on here and its worked every time. if you still got signs of headcase separation after tht then inspect the rifle.

 

[demolitionman]

I'd like to get the action face trued...I might cash in a favor to my dads friend who is a machinist. Can just any machin shop true an action face? This dude builds and machines parts race cars to airplanes. He trued a dirtbike clutch cover for me once....will I need to buy an action jig?

 

[demolitionman]

Gixxer, I've got a neck die...ill have this thing GTG this weekend. I just wanna do everything right cause I'm loadin up 243 for this weekend...I've got a good feeling about this "budget" 243 Savage...damn money pit...I love it.

 

[bjay]

1-3 is perfect on any bolt.. lapua virgin brass 5-10 thousand gas gun i do 3-6 sometimes .003 on gas little too hard to eject loaded round.the litle bulge is fine unless you have a match tight throat

 

[Temp9]

How did you set headspace when installing the barrel?

 

[demolitionman]

How did you set headspace when installing the barrel?

.002 from boltface to wwhere the cartridge datum stops in the chamber

 

[fx77]

1.5 to 2.0 thousandths at the shoulder.