Seating gas checked bullets

[calvon]

Quick question:

When seating gas checked bullets into a bottleneck rifle case, is it necessary to first flare the case mouth?

[Tom W.]

Yup, but just a little so that the bullet will just enter the case mouth.

[WayneS]

Yup, but just a little so that the bullet will just enter the case mouth.

YEP, WHAT HE SAID

[1sourdough]

 I also think a little champher on the inside of the mouth helps too.

[gypsyman]

100% on what everyone has said. The one thing I always made sure of, was never seating the bullet with the gas check past the neck of the case. I was always worried that the gas check could become tipped/dislodged from the base of the bullet. Even though I use the crimp on Hornady checks. gypsyman

[Calamity Jake]

Quick question:

When seating gas checked bullets into a bottleneck rifle case, is it necessary to first flare the case mouth?

Inside chamfer the case mouth a little and use a Lyman "M" die to expand, if adjusted right there is no need for a flair. therefore no flair to have to straighten back out.

[ron haralson]

You probably don't have to flair or expand the case mouths if you champher them well.

[leadman]

If you shave any lead off the bullet when seating this will cause leading. The Lyman "M" die is best to use as it makes a "shelf" in the neck for the bullet to set on and also opens up the case mouth to the proper dimension for a cast bullet.

Almost all dies size the necks for jacketed bullets, which is too toght for cast and can actually size down a cast bullet when seating.

[calvon]

I'll be loading for a custom 35 Whelen built on a Mauser 98 action, barrel by Chris Dichter of Pac-Nor Barreling, Bell and Carlson Medalist stock, topped with a Leupold VX-3 2.5-8x36mm scope. I'm using a 250 grain gas checked bullet made in a LBT mold. I'm using a Redding neck sizer die with the internal sizer removed and a .358 Lyman M die for neck expansion.

I've loaded jacketed rifle bullets for fifty years and loaded home cast pistol bullets for about twenty years. This is my first venture into loading cast for a rifle and I wanted some opinions on just how to go about it.

I'm open to ideas and comments. Thanks to all who responded.