Head space gauges

[legs748]

Am I being thick here but what is wrong with just keeping the trigger pulled so the cock on close action doesn't cock on close as the bent never touches the sear?

[bradaz11]

I'm guessing the firing pin sticking out the bolt with spring tension

[legs748]

My ohaus button gauges have a hole in the middle to clear it.

[waterford103]

I turned a set up for my various 303s , I drilled a hole in the middle rear to miss the firing pin. Dimensions are available on the interweb thingy and as it's a rimmed round dead easy to make. If I remember they are based on a rim thickness of 72 thou.

[ovenpaa]

I have some home made gauges for 54R and .303 and they work well for confirming things although they are not CIP approved :)

As the 54R and .303 can be in their simplest terms not much more than a washer it is a relatively cheap job to get a couple of sets made from hardened steel surface ground to thickness.