7x57 mauser

[360hunt]

For those that reload for this caliber I'm curious to what bullet diameter your using.
7x57 mauser takes a .285 diameter bullet. Anyone using .284 bullets?
So close my thoughts are a lead base bullet would just bulge to .285 ???
Is it worth worrying about being that close between to two.
Cheers 360hunt

[Steelhorse Cowboy]

European 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter.

First time I looked a this.
I shoot a Brno 41 in 7x57 .
Dad used it, bought ammo made in NA. Killed critters.
I load my own. Kill critters.
Nothing to worry about 1/1000"

Cheers

[360hunt]

Originally Posted by Steelhorse Cowboy

European 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter.

First time I looked a this.
I shoot a Brno 41 in 7x57 .
Dad used it, bought ammo made in NA. Killed critters.
I load my own. Kill critters.
Nothing to worry about 1/1000"

Cheers

Thanks that's what I thought but always nice to here some else's thoughts

[Pioneer2]

It wasn't a BRNO 21

[cowmanbob]

Speer used to make a (0.263) bullet. Shot many of these in a 264 win mag with fine results

[Dean2]

I load for 7x57, 7x57R, 7x64. 7x65R, 7 Rem Mag, and 7 Ultra Mag. I use Hornady .284 bullets of one sort or another in all of them. They will all shoot in the 1/2" range so I am thinking the bullet size is adequate.

[Bushrat]

Originally Posted by 360hunt

For those that reload for this caliber I'm curious to what bullet diameter your using.
7x57 mauser takes a .285 diameter bullet. Anyone using .284 bullets?
So close my thoughts are a lead base bullet would just bulge to .285 ???
Is it worth worrying about being that close between to two.
Cheers 360hunt

Don't know of any modern manufacturers who are making 7 x 57 rifles with a .285 bore anymore, they are all using standard .284. No idea where you would find .285 bullets either.

[Dean2]

If you really want larger diameter bullets, Woodleigh makes a .287 and Hawke makes a .286. Privi makes a .285.

[Dick284]

For 1/1000” (you should really try to rationalize how small that is) difference I’m pretty sure bullet obturation would look after the difference.

[360hunt]

I thought it wouldn't be a big deal at all.
But I prefer hearing people that are already doing and any negative results. With that said. No big deal...284 is fine.
Thanks all

[Steelhorse Cowboy]

Nice catch Pioneer2!
I stand corrected its a 21H not 41

[Pioneer2]

I have one as well ...............same hole repeatable accuracy.