Hollow Base Paper Patch

[nkbj]

My .40 with 16" twist has a small land width relative to the groove width.

I'm about to have a mold put together for paper patch and have got to thinking about whether or not to go to the expense of having a hollow base.
When using paper patch in fast twist barrels, is a hollow base particularly beneficial to accuracy by virtue of sealing the bore or is it really going to matter?
And on the other hand, might a hollow base assist in getting expansion without as much lead and powder?

 

[Richard Brinkman]

One thing about a hollow is that it will increase the length of the bullet without increasing the weight. I don't know if that would be + or - guess it would depend on what the shooter wants.

RB

 

[Ed Wingenroth]

Hi All !!!

It has alway's been my understanding that the "Minnie-Ball" was developed to facillitate speedy loading (no patch, no ramming) at the expense of accuracy.. There was more interest in the firepower than the single shot hit better served by the Sniper !!! Guy's like Pope liked paper-Patch and made record's still standing...

Good Luck !!!

Ed...

 

[Rifleman1776]

RW may have nailed it. The slug gun shooters are the experts in this area. Just from observing them, I don't believe hollow base are much, if at all, in use by those really-really serious 'X' hunters.

 

[paulab]

You do not need a hollow base bullet at all. Excellent accuracy can be gotten with standard flat base bullets. Try some loads with and without an over powder wad to see which your rifle likes best. Cheers Paul

 

[Frank Savage]

From my experience-avoid such a kind of cupped base on ML bullet. They are prone to slump a bit less even than flat based bullets, also it´s easy to distort the edge a bit when loading under some pressure. Then you´ve good start for a wild flyer with no obvious reason.
If the cup had about 1/12" wide flat rim, square to the body-than maybe, but no gain from it. Flat base mould is easier, allows you to make a bottom pour easily.
The BPCR guys would tell you the same.

 

[nkbj]

Thanks for the thinking.

 

[nkbj]

Looks like I get to go home in about a week.
Have a beautiful .399" push through sizer on the way that will beat me there.