Enfield No4 Mk1 Question...

[Gunsmithinflorida]

[QUOTE=Alan de Enfield;479318]For Lee Enfield Rifles there is officially no such thing as a 'Field Gauge', there is only 'Go' (0.064") and 'No-Go' (0.074")
SAAMI have decided to implement their own modern requirements onto historical British military rifles.

I imagine the Midway no-go gauge is well below the required 0.074" as the SAAMI specifications stipulate 0.067" for '30-cal' rifles.

Interesting. I measured several case rims and .056" seems average. My no-go gauge is like you said .067". Forster offers a field gauge and now I am curious about its dimension. The required .074" is .018" over the cases I measured.

[Alan de Enfield]

Interesting. I measured several case rims and .056" seems average. My no-go gauge is like you said .067". Forster offers a field gauge and now I am curious about its dimension. The required .074" is .018" over the cases I measured.

Despite your forum 'name' I presume you are not familiar with head spacing rimmed cartridges, or, the Lee Enfield Rifles.

Your previous statement about using the 'numbers' for sizing the bolt-head is a little confusing to newbies if taken literally as it is not unusual to find a Number 0, or a No1, or a No2 bolt head larger than a No3 bolt head. The 'numbers' are supposedly indicative of size, but at the end of the day the actual dimensions are the critical measurement. You cannot just say replace a No2 with a No3.

Also, It looks as if you are measuring USA SAAMI cases rather than military 303 specification cases.

The Likes of Win & Rem are 'built to a price' and tend to be way down at the bottom end of the specification (the specification for Rim thickness is 0.054" - 0.064")

Maybe looking at this will show the difference :

One of Win's 'better offerings' at 58 thou & PPU at 62 thou