Tight bore barrel

[EventHorizon]

For a .30 cal, does this type of barrel negate the benefits of having the bullet off the lands? Wouldn't it make more sense to have it on the lands in this case?

Also, If the barrel is tight bore, would it not make sense to soft seat the bullet, assuming the chambering/headspace is held to very tight tolerances, would this not give you the optimal set up for your rifle?

 

[gcoulsey]

Re: Tight bore barrel

I'm not sure how a tightbore can benefit/negate seating depth?
By altering the seating depth, we are fine tuning the pressure curve, just one of the many variables to finding what the individual rifle setup 'likes'.
I would imagine that finding your sweet spot of jump/jam with any given components would apply just the same to a tightbore, as a normal spec barrel..

With the exception of hitting maximum pressure sooner with a tightbore, develop a load as normal, and it MIGHT like a jam, or it MIGHT like a jump.

 

[Hummer]

Re: Tight bore barrel

What do you consider a tight bore? I have tight barrels and one is .298x3055. Another is .2983X.307.

The .298X.3055 must be downloaded about four grains to develop the same velocity a normal barrel (.300X.308")gives so start off with the lowest recommended load and work up and you should be OK.

It is amazing what one can see with a good bore scope. I have barrels that the bullet does not touch the bottom of the grooves all the way to the muzzle. Others contact about 1/4th of the grooves and my tight ones only contact about half the grooves.

 

[Clark]

Re: Tight bore barrel

I have some Parker Hale sniper trainer 308 barrels with .2985" bore.

A fixed pilot will not fit.

 

[EventHorizon]

Re: Tight bore barrel

thanks guys, will start on the low end and experiment with depths. I got the notion of soft seating from some articles I read on how some Palma shooters approach seating their rounds.