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Discussion Starter · #1 ·
I am currently looking at wildcatting one of my .303 rifles. Its called the 303Epps. anyways there are three different action strengths for the .303.

smle 45,000CUP
No.4 48,000CUP
P14 52,000CUP

With this .303Epps you should only use the p14 action. There is lots of proper loading Data for this cartridge. The thing is if I shoot a proper size bullet to bore diameter will that increase pressure? If it does that could become an unsafe thing. How can you measure pressure generated by a cartridge? Is it a formula to do with muzzle velocity?
Is it some fancy equipment ?

madgunsmith seems to know abit about surplus rifles but any info would be great

Thanks guys
Geoff
 

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Discussion Starter · #2 ·
I guess I left one thing out. On a .308 that measurement is from groove to groove. The .303 on the other hand is from land to land and the grooves are suppose to be .005 to .0055. So if you work it out the correct bullet size should be .313 or .314 depending on what size the barrel made it to. The normal .303 bullet is .311. So what I guess I'm gettin at is having a tighter fitting bullet in the bore will that seal better and raise combustion pressure? Or do you think that the .311 bullet grows enough to seal properly?
 
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