cart SHOPPING CART You have 0 items

Discussion Forums

Search forums
Forum Index > Rifles general discussion > med length cartridge/modified x57

med length cartridge/modified x57

11 Mar 2016
@ 04:14 am (GMT)

Thomas Kitchen

hi guys
so the other day i was thinking there must be away of making better use of mauser/tikka length rifles.

i was thinking maybe if you had an 308 or 7mm 08 rifle you could run a 30.06 or 280 reamer in so much then just slowly neck back 30.06 brass until you could close the bolt.
i then worked out few issues knowing neck length, variable chambers on each rifle, and because of the different taper between 30.06 and 308 you would end up with a step in the chamber.

then i wondered if you could use a 308 chamber reamer and just over run it in a bit. its at this time i clicked that there is the x57 cartridges that full nicely in the middle but this doesn't help you if you already have a rifle chambered in 308 or 7mm-08.

my question is could you run a 308 win reamer further into a chamber and use a X57 head space gauge to set depth? might seem like a hassle but im guessing 100fps plus gain

brass would be simple use 7x57 brass or trim back 06 length brass and make a neck using a f/l die in either 308 or 7mm-08 not screwed fully down.
i played around with using 270win brass trimmed and ran through a 308 die.
left to right
308win with 168gr amax, 270 trimmed necked to 308 with 168gr amax start of boat tail inline with bottom of neck and 270 next to it.

made dummy round in tikka mag and mauser


11 Mar 2016
@ 05:29 am (GMT)

Mike Davis

Re: med length cartridge/modified x57
so in effect you are making a ???/ 7.62x57mm ?????
trying to go between .308 and .30/06 in velocity etc are you realistically going to improove on the .308????? more than other more simple methods??? like a K hornet surely someone already does this to .308 winchester.
I believe there are quite a few guys now doing the .284 something or other that is in that length action but faster than 7mm/08 already.
11 Mar 2016
@ 05:31 am (GMT)

Mike Davis

Re: med length cartridge/modified x57
But I do like way you thinking and it sure looks good,maybe a 7x57 would just save lot of hassle and its a pretty well proven round as it is without any mucking around.
11 Mar 2016
@ 06:52 am (GMT)

Thomas Kitchen

Re: med length cartridge/modified x57
sorry mike should of explained a bit better.
idea is to do a second chamber cutting over an original 08 variant.
maybe as away to get little more out of a barrel that the throats is showing signs of wear or to get bit more velocity.
like you say some people will get there 7mm-08 tikka reamed out to 284 win with a similar idea.
if you were getting a brand new barrel it would be simply easier to go different route.
i think the 7x57 would have more taper but don't have any to compare.
it also depends on how long a reamer is pass the the set cartridge and if its got parallel sides once its pass the rim length or if it tapers.
11 Mar 2016
@ 07:50 pm (GMT)

Nathan Foster

Re: med length cartridge/modified x57
Hi Thomas, You could run a 7x57 reamer in (or 7x57 AI), then run a .30-06 reamer in to cut the neck, then run a PTG uni-troater to cut the leade. That would give you a .30x57.

Velocities would be halfway between the 7x57 and 8x57. I am not sure if its worth the muck around though because the Tikka can utilize the .30-06 cartridge without fuss.

If you had a 30x57 AI for the sake of running the heavy 208gr ELD seated long, I would expect perhaps 2500fps? It could go faster but it always pays to exercise caution otherwise it can lead to disappointment.


We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.