7mm rem mag head space.

[HuntinGuy]

I am new to reloading and i am attempting to set my head space on my once fired cases. I am aware that belted magnums head space off the belt, but should not the cases stretch when fired and head space off the shoulder? I want to just bump the shoulder back. I tried the Sharpie method and show no marks on the shoulder, also i pulled the pin and spring on my bolt and tried to feel for resistance on my bolt but felt nothing. Should i just bump the shoulders 2-3 thousandths from where they are not knowing how far they sit from the shoulder in the barrel?

[elkhunter11]

If the cases chamber easily, don't bother bumping back the shoulder, just neck size. If the cases provide more resistance than you like to chamber, bump the should back just enough so that the cases chamber easily.

[fish_e_o]

Use a gauge please

[HuntinGuy]

I like the idea of always bumping the shoulder to ensure a consistent and reliable feed every time. Also correct me if I'm wrong but a gauge will not set me to my chamber but to SAMMI spec and off the belt.


Sent from my iPhone using Tapatalk

[fish_e_o]

Originally Posted by HuntinGuy

I like the idea of always bumping the shoulder to ensure a consistent and reliable feed every time. Also correct me if I'm wrong but a gauge will not set me to my chamber but to SAMMI spec and off the belt

Then get a different rifle or chamber it for something else

[HuntinGuy]

Originally Posted by fish_e_o

Then get a different rifle or chamber it for something else

Sorry you didn't know how belts work.


Sent from my iPhone using Tapatalk

[fish_e_o]

Originally Posted by HuntinGuy

Sorry you didn't know how belts work.


Sent from my iPhone using Tapatalk

I know how trying to determine headspace works and I'm telling you that you're doing it wrong.

You should try to actually measure something. your random piece of brass that is probably not even close to spec isn't a way to set headspace.

[prarie_boy1]

I load .338 win mag for a friend and use my calipers and an insert that measures the particular shoulder angle of that cartridge. Take an average of 5-6 fired cases and set the die up so it pushes the shoulder back about .002-.003 in hunting rifles.