7mm Rem mag H1000 Load data?

[Jimbo69]

Hi,

Is it OK to use 72gr (max) of H1000 in a 7mm rem mag under a 160g partition bullet?

I saw this max load many places. On the other hand, i saw many other books with a 66gr (max) of H1000 with this 160gr bullet.

Why a full 6gr differance?
And why 7mm Rem Mag data is so anemic compared to commercial loads?

Thanks!

 

[Dunno]

My Ruger #1 maxed out at 70 gr H1000 with the 160gr Partition, Hornady case and Remingtton 9 1/2M primers. This gave me nearly 3100 fps out of my 26" barrel. A very accurate load when I did my part. Kind of an oddball combination, but it is what I had on hand and the time and it worked. One note with my loads, I was able to seat them out a loooong ways with my Ruger's generous throat. This does decrease pressures somewhat which is why I was able to use 70 grains of powder.

 

[sunray]

"...OK to use..." NO! Hodgdon gives 66.0 grains of H1000 as the max load for that bullet weight. BOTH 72 and 70 grains is too much. To the point of being dangerous. Follow your manual religiously.
How far out the bullet is seated is irrelevant when you're loading 6 grains over max.

 

[todbartell]

I used 72 grains of H1000 under a 140 grain Barnes TSX in a 700 Sendero I had/3200 fps*

With a 160 grain bullet, start low and work up until your chrony says 2950-3050 fps and then call it good.

Alot of 7mm Mags will digest 66 grains of RL22 or H4831sc, both are faster burning than H1000

 

[Silverado]

DO NOT take the following for absolute truth:

QuickLoad calculates 72gr of H1000 in 7mm RM with 160gr Nosler Partition to produce 59734psi, is a 6% compressed charge, and produces calculated velocity of 3022fps from a 24" bbl, 3083fps from 26" bbl.

Start low and work up.

 

[Jimbo69]

"...OK to use..." NO! Hodgdon gives 66.0 grains of H1000 as the max load for that bullet weight. BOTH 72 and 70 grains is too much. To the point of being dangerous. Follow your manual religiously.
.

Ok here's my problem. Take this Hodgdon data and check loads for H1000:

140gr NPart 70gr max of H1000

170gr SieRN 71gr max of H1000 (30gr more bullet and 1gr more powder)

Even the 162 grains HornSp is listed 70gr max of H1000.

That's why i think 66gr at 2840 fps is pretty conservative.

Thanks!

 

[Jimbo69]

DO NOT take the following for absolute truth:

QuickLoad calculates 72gr of H1000 in 7mm RM with 160gr Nosler Partition to produce 59734psi, is a 6% compressed charge, and produces calculated velocity of 3022fps from a 24" bbl, 3083fps from 26" bbl.

Start low and work up.

Hi,

I saw 2 others 72gr of H1000 indications.

1. Steve's reloading
2. Lee Modern Reloading

Going to range tommorow. I will not strech to 72gr, but 70gr of H1000 will be acceptable for me.

Thanks!

 

[Silverado]

Ok here's my problem. Take this Hodgdon data and check loads for H1000:

140gr NPart 70gr max of H1000

170gr SieRN 71gr max of H1000 (30gr more bullet and 1gr more powder)

Even the 162 grains HornSp is listed 70gr max of H1000.

That's why i think 66gr at 2840 fps is pretty conservative.

Thanks!

The reason why some bullet weights and powder charges won't always seem to make sense is that stiffer bullets cause higher pressures.

The Nosler partition is substantially stiffer, with the solid jacket partition in the middle, than the Sierra, which is a standard jacketed lead core.

 

[Silverado]

Ok here's my problem. Take this Hodgdon data and check loads for H1000:

140gr NPart 70gr max of H1000

170gr SieRN 71gr max of H1000 (30gr more bullet and 1gr more powder)

Even the 162 grains HornSp is listed 70gr max of H1000.

That's why i think 66gr at 2840 fps is pretty conservative.

Thanks!

The reason why some bullet weights and powder charges won't always seem to make sense is that stiffer bullets cause higher pressures.

The Nosler partition is substantially stiffer, with the solid jacket partition in the middle, than the Sierra, which is a standard jacketed lead core.