223 freebore - Factory ammo jump

[Southpaw357]

Question for the Hidemind,

I want to build a 223 trainer setup like my 6.5 CM - impact action in an MDT chassis with 28” MTU contour barrel.

My smith stocks 1-7 twist brux barrels and his 223 reamer’s freebore is somewhere in the 0.100 / 0.125 range (he has to confirm exact dimension with me).

The thing is, I will be shooting factory ammo for the forseeable future. So no rounds longer than SAAMI length at least for now.

Who has experience with this much jump and factory ammo? Am I shooting myself in the foot?

69 and 77 SMKs loaded by whomever are on the menu, and maybe some factory loaded bergers.

Thanks fellas.

 

[oldrifleman]

Mine is only a .080 free bore but it likes factory as well as longer 80.5 Berger.

 

[King_beardsly]

I think the freebore on mine is .100 and it seems to chuck factory stuff without much thought. Granted I’ve just been running 73gr GMM through it for factory stuff.

 

[Southpaw357]

I think the freebore on mine is .100 and it seems to chuck factory stuff without much thought. Granted I’ve just been running 73gr GMM through it for factory stuff.

Thats good to hear. You are happy with your groups?

 

[diggler1833]

.223 Wylde has .062 freebore, and that will get you around 2.400 OAL" before you end up running into the lands with a SMK...so you'll be jumping a ton. I'm at 2.400" (I'll have to verify by looking at my posts in the .223 load thread, but I'm only jumping .025-.030") with a 75gr ELD-M in a .223 Wylde chamber.

.100 - .125 is more suited for bullets in the 80+gr range. Fortunately the SMK isn't as affected by jump.

 

[Southpaw357]

.223 Wylde has .062 freebore, and that will get you around 2.400 OAL" before you end up running into the lands with a SMK...so you'll be jumping a ton. I'm at 2.400" (I'll have to verify by looking at my posts in the .223 load thread, but I'm only jumping .025-.030") with a 75gr ELD-M in a .223 Wylde chamber.

.100 - .125 is more suited for bullets in the 80+gr range. Fortunately the SMK likes to jump.

Copy that and thanks for the data. Yep I understand its a long jump to the rifling, just want to know if people who have this setup get good groups out of their factory ammo . Seems like they should so long as everything is square and true and the bullets like to jump.

 

[diggler1833]

Copy that and thanks for the data. Yep I understand its a long jump to the rifling, just want to know if people who have this setup get good groups out of their factory ammo . Seems like they should so long as everything is square and true and the bullets like to jump.

My .223 Wylde shoots the factory 77gr Sierra load into a half-minute (5 shots), which is amazing since the ES and SD of that ammo sucks. I figure that the jump is a good .160"+ since I think it is loaded to something like 2.235 OAL.

 

[Southpaw357]

My .223 Wylde shoots the factory 77gr Sierra load into a half-minute (5 shots), which is amazing since the ES and SD of that ammo sucks. I figure that the jump is a good .160"+ since I think it is loaded to something like 2.235 OAL.

That’s great!