who's data do I go by?

tinymike66

tinymike66

CGN Regular
EE REVOKED
Rating - 98.8%
81   1   0
Location
Hamilton, Ontario
Hello all,

so I am looking at two different load data for my 460 mag revolver.

one is from the Powder manufacturer, the other from the projectile manufacturer.

Hodgdon Data:
Primer: Winchester LRM, Large Rifle Magnum
Trim Length: 1.790"

Bullet Weight
300 GR. HDY XTP MAG.

Powder H110
C.O.L. 2.160

Starting Loads
38.0 gr
1,825 vel

Maximum Loads
42.5gr
2,034 vel



Bullet Weight
300 GR. HDY XTP MAG.

Hornady Data
Powder H110
C.O.L 2.275 max
Primer : WLR

Starting Load
33.4 gr
1400 vel

Max Load
39.2 gr
1550 vel


so the differences ARE
HODGDON based on 10.743" barrel
Large magnum primers
higher loads

Hornady
Data based on 8.38" barrel
lighter loads
Large rifle primers.

What I have.
460 xvr 8 3/38 barrel
H110 powder
Hornady 300gr XTP MAG projectiles
Federal Large Rifle magnum Primers.


Any opinions?
I hear H110 can be finicky if loaded as low as 8% below max and might not egnite.
 
I would start at the starting loads of the lower data, and see how comfortable and easy to shoot it was. I have used H110 at loads considerably lower than 8% under full load and they worked just fine.
The major difference in power between two similar revolvers is the gap between the firing cone and the cylinder, where gas escapes on firing. The gas escaping from this gap usually makes more difference than a difference in barrel length.
If you have automotive feeler gauges to measure the gap, you will find that .006" is a very tight gap. More typical of a large bore revolver may be .008" to .012", or even .014".
The gas escaping acts a partial safety valve for excess pressure, also.
 
I always use the power makers numbers. Basicily i always check hodgdons site, if its not on hodgsons reloading site, ill look else where to find it but i always use their numbers over anyone elses. ( all my power is hodgdons other then the w231 i have)

In this case, i dont think you will have any issues using the lower numbers and working up.
 
H4831 is giving the "safest" advice. Usually when I work up a load I start with a combination that gives me a velocity very close to factory specs with components I have on hand. This should be a safe way to go. The only fly in this ointment is when the powder you have on hand is very fast for the job.

The cartridge you list is a magnum cartridge and as usual, magnum cartridges perform their best at near max loads. I suspect H110 doesn't fill the case adequately for consistent and reliable ignition.

It also sounds like you're trying to conserve components or reduce the load so that it's more pleasant to shoot.

If this is the case, you will need to find some way to take up space between the powder and the bullet. In the past I have used a piece of paper cut with a punch over the powder with dacron fiber between the paper and the bullet. This takes a bit more time but it does the job very well. The small weight of the "filler" is negligible in your case.

I don't know how much you shoot this firearm but if you shoot it a lot, I would look for a more bulky/suitable powder.

Starting with factory velocities has always proven safe for my endeavors. It's only when trying to make up "light plinker loads" that trouble arises.

The nice thing about factory loads is that they may approach maximum pressure but they won't be over max. A 5% reduction is usually no problem.
 
bearhunter said:
H4831 is giving the "safest" advice. Usually when I work up a load I start with a combination that gives me a velocity very close to factory specs with components I have on hand. This should be a safe way to go. The only fly in this ointment is when the powder you have on hand is very fast for the job.

The cartridge you list is a magnum cartridge and as usual, magnum cartridges perform their best at near max loads. I suspect H110 doesn't fill the case adequately for consistent and reliable ignition.

It also sounds like you're trying to conserve components or reduce the load so that it's more pleasant to shoot.

If this is the case, you will need to find some way to take up space between the powder and the bullet. In the past I have used a piece of paper cut with a punch over the powder with dacron fiber between the paper and the bullet. This takes a bit more time but it does the job very well. The small weight of the "filler" is negligible in your case.

I don't know how much you shoot this firearm but if you shoot it a lot, I would look for a more bulky/suitable powder.

Starting with factory velocities has always proven safe for my endeavors. It's only when trying to make up "light plinker loads" that trouble arises.

The nice thing about factory loads is that they may approach maximum pressure but they won't be over max. A 5% reduction is usually no problem.
Click to expand...

Makes sense.
I did 5 at 37.2 gr
And 5 at 38.9gr
Will test them tomorrow
 
You must log in or register to reply here.
Back
Top Bottom