head space

[kevin01041961]

Hi everyone now I'm not new reloading been doing it for years , But my question is how do i find the best head space is it trial and error only .I know my oal I've reloaded the same powder measure 42 grains of H450 { which you cannot get anymore} my rifle is a Browning A bolt is there a sweet spot from the rifeling i should go for do i back a 1000 at time or more , My 308 is a Tikka T3 my 7mm rem mag is a sako

Can you help?

 

[areaone]

NOT Headspace question, you are wanting to know FREEBORE(FB), Use a empty case seat a bullet LOOONG and try to chamber it, note the marks on the bullet where it touches the lands, this would give an approx FB to be calculated.

 

[LHSmith]

To make it easier to see the marks, polish the bullet with fine steel wool.

 

[bigedp51]

Hi everyone now I'm not new reloading been doing it for years , But my question is how do i find the best head space is it trial and error only.

It depends on how much you tilt the glass and how fast you pour.

 

[gotcha]

Looks like big Ed has captured the Christmas spirit. (Pun intended)

 

[gotcha]

Kevin, An Alternative. F/L size a case. Using a Dremel cut-off wheel carefully put a vertical cut from case mouth to Nk shoulder junction. Deburr the length of the cut. Barely insert bullet into case then gently chamber & close bolt. Measure w/ comparator. Repeat several times to insure a consistent reading. (bullet not sticking to lands & pulling slightly out of case).... If you're loading from a magazine, Max bullet seating depth will be a function of magazine space. However, you can still vary seating depth accordingly by .005" or .010" increments to find your most accurate seating depth. You'll need a comparator tool to pull this off.