Thread: 250-303

I wasn t aware there were variants
I have lee dies and had to bump the shoulder down 50 thou for the case to chamber

Originally Posted by bearfighter

I wasn t aware there were variants
I have lee dies and had to bump the shoulder down 50 thou for the case to chamber

50 thou or 5 thou? 50 seems an awful lot.

50 thou checked by licensed gunsmith
looking for some load information
will reduce loads or rechamber

Originally Posted by bearfighter

50 thou checked by licensed gunsmith
looking for some load information
will reduce loads or rechamber

Greetings, I would not rechamber, just size your cases to fit the chamber. Should not make any significant difference to your loads. The first thing would be to measure the barrel twist to see what projectiles should shoot in it. It may be a slow twist which would limit you to the lighter projectiles. Please get someone to mentor you with your load development. There is data out there but how safe it is is anybody's guess.
Regards Grandpamac.

Originally Posted by bearfighter

50 thou checked by licensed gunsmith
looking for some load information
will reduce loads or rechamber

Just curios here, if you don't mind my asking.
Is there such a qualification under NZQA?

I just had a quick look, in NZ there is a voluntary gunsmith register:
https://www.armsregister.com/gunsmit...pplication.pdf
You just need to be a Kiwi with a firearms license for that though.
Overseas people in NZ would need a NRA qualification in gunsmithing or similar.

I have been lazy and not researched it myself, is any such thing up and running in NZ?

don t know how it works in NZ in canada we would have to have a machinist ticket to apply to a gun smithing school

Originally Posted by bearfighter

I wasn t aware there were variants
I have lee dies and had to bump the shoulder down 50 thou for the case to chamber

Might have misled you there bearfighter, the variants are in the .303/.22’s. 3 or 4 different case dimensions.


Sent from my iPhone using Tapatalk

Originally Posted by bearfighter

I wasn t aware there were variants
I have lee dies and had to bump the shoulder down 50 thou for the case to chamber

so HOW did you bump shoulder down 50thou????50 thou from what? or are you saying when fired the cases have grown so much you needed to make them 50 thou smaller than the after fired size??? if your dies are hitting base....thats your saami spec size give or take a flyshit..so if indeed your fired case is way bigger.... set your die to only move it just enough to chamber again.

Mickey Duck. never fired a round through the gun, we run a 303 case through the 250-303 lee dies and the case would not chamber. I believe we then used a 257 Roberts sizer die to bump the should back until the case would chamber in the gun. we trimmed the neck to the same length as the original specs.we then loaded 2 rounds with light loads and fire formed them to get the actual chamber dimensions . We then removed 50 thou from the bottom of the die, rounds will now chamber just need load information for shorten case