help 6mm XC in shorter barrel (22")

[Samuel John Foreman]

Im getting ready to build a new project 6mm XC and am looking for information regarding this project. I want to run a shorter barrel for portablilty and ease of use it will be used mainly for spotlighting, but want it to be used at the local 1000 yrd range as well. I will most likley use norma 6mm xc brass but want to know what the Lapua 22-250 brass is like in respect to base size and if there becomes a donut in the case neck when reforming them. I am intending on running the 107-108 gr bullets from berger and H4350 powder.

If anyone has experiance with this caliber and short barrels i want to know what velocity range to expect.

I also want some input as to what freebore to be looking at with the 107 gr vld bullets, from what i ahve read it looks the be somewhere around .100~.110" range.

So far i ahve a Kreiger 6mm heavy varmint barrel, defiance deviant action on order
will be running a manners stock T4a, Timney trigger and a bit unsure on optics atm.

Regards Sam.

 

[Trevor300wsm]

How short of a barrel do you want and what velocities are you expecting to achieve? I run a 25" barrel with a Berger 105 Hybrid and 40.2gr of H4350. After 800 rounds im getting 3,020fps. It shoots very well.

 

[Samuel John Foreman]

Im looking at short and stiff about 22" but am still happy to get out to 24" if needed.

 

[HodgdonExtreme]

My 24" xc ran ~3050 with 105 hybrid over 40gr H4350.

Not sure on base size of Lapua 22-250, but Winnie and RP brass will leave a bulge when fired in a traditional 6xc chamber cut for Norma brass. Mind you, the bulge doesn't hurt a thing.

As for donuts: throat the chamber correctly and forget about them. No worries provided you're not seating the bullet into them. The xc has a pretty long neck and even loading "long", fits magazines no problem. I recommend you section a case, seat the bullet you're intending to use so it's approaching the neck/shoulder junction, and then create a dummy round based on that. Give it to your smith and have him throat the chamber accordingly.

 

[JGorski]

In my 2nd 6Creed Im running a 104FB for VLDs/Hybrids, I'd think that should suit the XC as well.

 

[Samuel John Foreman]

Thank you for the input guys, this is starting to look very positive.

Regards Sam.