Hollow base bulleta
- Thread starter 1stmar
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jwrowland77
New member
I believe from what I've read, as the gas expands, it cause the hollow base to expand and get a good seal while pushing the bullet down the muzzle.
Yep. Above is correct.
The base of the bullet "obturates" - uhh, it expands up, sealing the base of the bullet against the barrel lands n grooves. It basically maximizes velocity and accuracy, while minimizing barrel leading (if applicable)
It does, however, have a drawback. When loaded too hot, they will over-obturate - distort, if you will - potentially causing barrel damage and other issues. The least of which, being a very inaccurate round.
The base of the bullet "obturates" - uhh, it expands up, sealing the base of the bullet against the barrel lands n grooves. It basically maximizes velocity and accuracy, while minimizing barrel leading (if applicable)
It does, however, have a drawback. When loaded too hot, they will over-obturate - distort, if you will - potentially causing barrel damage and other issues. The least of which, being a very inaccurate round.
snapshot762
New member
Hammerhead
New member
No effect on pressure as they take up the same case volume as a standard base bullet, it's just shaped differently.
Appreciate the responses. They are berrys, I have previously bought berrys, same weight but they were not hollow base. Plan on going to the range today I will compare accuracy with the 2, flat base and hollow base. The flat base I got very good accuracy in my lcp less the. 2" group at 10 yards. Given the sights and the trigger I was very pleased with that. Will report back.
g.willikers
New member
Pretty sure that the hollow based bullet is more about a length vs weight design thing than sealing the bore.
The original Minie design was for a large caliber with soft lead bullets and no jacket.
They loaded easier from the front than ball and patch, and still engaged the rifling when fired.
From my own muzzle loader experience, they are not nearly as accurate as the ball and patch, though.
How that translates to the reason for modern hollow based bullets.....??
The original Minie design was for a large caliber with soft lead bullets and no jacket.
They loaded easier from the front than ball and patch, and still engaged the rifling when fired.
From my own muzzle loader experience, they are not nearly as accurate as the ball and patch, though.
How that translates to the reason for modern hollow based bullets.....??
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FrankenMauser
New member
Load them to the same OAL as you would any flat base bullet of the same weight and nose profile. The volume inside the loaded round remains essentially the same, even if the base of the bullet is seated deeper than a corresponding flat base bullet (the hollow base makes up for it).
In theory, you can get a little "over expansion" of the base/skirt as the bullet is exiting the barrel. But, in practice... it's a complete waste of time to worry about such things. I've never seen anyone that has been able to document the phenomenon or any evidence of it, nor have I seen evidence of it with BHN 7 (super soft) hollow base wadcutters, in 30k+ psi .327 Federal loads.
They lead the barrel like crazy, but they don't 'over expand' as they exit.
There is nothing to worry about, besides the every-present "Is my firearm going to like this bullet, or print shotgun patterns with it?"
Hollow base bullets will do nothing to your barrel, that the high pressure gasses won't do on their own.
In theory, you can get a little "over expansion" of the base/skirt as the bullet is exiting the barrel. But, in practice... it's a complete waste of time to worry about such things. I've never seen anyone that has been able to document the phenomenon or any evidence of it, nor have I seen evidence of it with BHN 7 (super soft) hollow base wadcutters, in 30k+ psi .327 Federal loads.
They lead the barrel like crazy, but they don't 'over expand' as they exit.
There is nothing to worry about, besides the every-present "Is my firearm going to like this bullet, or print shotgun patterns with it?"
I've used a lot of hollow-base 200gr bullets in .45 ACP. There is not merely a rounded depression in the base, but a deep hole, almost like that of a hollowpoint.
I was thinking that the point was to create a longer bearing surface for a given weight, as broached above, and there might be something to that, but I did run into problems apparently related to the change in relationship between bullet weight and internal case capacity.
When I used the load data that I'd used for flat-based bullets, velocities were down. To get back to the velocity I wanted, I had to exceed recommended max loads for my powder of choice. By reducing OAL, I was able to get the charge weight/velocity relationship I was used to; to get the same velocity with the hollow base round nose as with plain base round nose, I had to shorten OAL to 1.2" from 1.26".
I was thinking that the point was to create a longer bearing surface for a given weight, as broached above, and there might be something to that, but I did run into problems apparently related to the change in relationship between bullet weight and internal case capacity.
When I used the load data that I'd used for flat-based bullets, velocities were down. To get back to the velocity I wanted, I had to exceed recommended max loads for my powder of choice. By reducing OAL, I was able to get the charge weight/velocity relationship I was used to; to get the same velocity with the hollow base round nose as with plain base round nose, I had to shorten OAL to 1.2" from 1.26".
serf 'rett
New member
From Berry's web site:
http://www.berrysmfg.com/product-i14471-c10-g8-b0-p0-380_Cal_100gr_HBRN_1000ct.aspx
As previously stated, effect on pressure should be minor.
Range Report?
2" with an LCP is good. Are you shooting the LCP offhand or from a rest?
http://www.berrysmfg.com/product-i14471-c10-g8-b0-p0-380_Cal_100gr_HBRN_1000ct.aspx
As previously stated, effect on pressure should be minor.
Range Report?
2" with an LCP is good. Are you shooting the LCP offhand or from a rest?
Regrettably I didn't make it to the range this past weekend. Will get there sat or Sunday should be picking up a new m1a and a recently bedded 06. So I have some toys to try out.
Shooting offhand. I love that thing, I'm amazed every time I shoot it how accurate and easy it is to shoot. I shoot dueling post at 25 yds with ease.
Shooting offhand. I love that thing, I'm amazed every time I shoot it how accurate and easy it is to shoot. I shoot dueling post at 25 yds with ease.
Went to the range today and did quite a bit of rifle, then finished up with the 380. My eyes never really got settled in so I cheated. I have a laserlyte side mount and since I was having trouble focusing I figured for shooting groups I'd use the laser. 5 shot group with the flat base 100 gr berrys over 3.4gr of 231 were 1.66". 5 shot group with the hollow base 100gr berrys over 3.4gr of 231 were 1.59". No difference. I then loaded a mag with alternate rounds of flat and hollow base and shot 5 shot string to see if I could notice any difference in recoil as potentially an indicator of pressure. I have no pressure measuring device and I realize this may not be an indicator of pressure. I couldn't tell any difference. If my eyes were working better I would have gone back to 25yds but I think after shooting through a scope for so long I just couldn't get focused. Anyway unscientific but from my perspective there is no discernible difference. All shots were offhand.