7mm rem mag

[Fredk]

Currently loading 168 Sierra at 59.5 of h1000
Cci primer overlapping at 100yrd but 200 and 300 are all over the place anyy ideas why

 

[Dogleg]

Check your parallax.

 

[Hitzy]

That's a pretty light load there.
Nosler lists Start at 66gr max at 70gr for H1000 and 168gr.

 

[freire]

That's a pretty light load there.
Nosler lists Start at 66gr max at 70gr for H1000 and 168gr.

Totally agree with this assessment.
What kind of velocity are you getting with this load?

 

[Hitzy]

Bullets are likely not stabilized past 100m, pushing them too slow.
You also run the risk of a kaboom when not loading slow powder to proper pressure.

 

[Leatherstocking]

Bit annoying that you have to buy the data from Sierra.
Lee manual doesn’t list any data for 168 grn with H1000.
170 grn jacketed bullet, min 68 , never except 71grn, H1000.

 

[Suther]

Bit annoying that you have to buy the data from Sierra.
Lee manual doesn’t list any data for 168 grn with H1000.
170 grn jacketed bullet, min 68 , never except 71grn, H1000.

There are a lot of online sources that don't need to be bought.

Nosler is one of my go-tos for a quick check because I can just google "[cartridge] nosler data" and get what I'm looking for (assuming its not some super niche cartridge they don't have data for of course). They have H1000 w/168gr bullets. 66gr min, 70gr max.
https://www.nosler.com/7mm-remington-magnum

 

[jamesharrison]

QL shows 59.5 grs. of H1000 behind a Sierra 168 gr. HPBT (MK) at 3.280" C.O.A.L. should yield 2,442 fps @ 34,000 psi. This represents an 88% load density which, as others have said is nicht gut with the slow-burning powder.

GRT pretty well mirrors that showing 2,478 fps @ 34,084 psi at 87.5% load density.

btw, Sierra does list H1000 with that bullet. Their starting load is 60.5 grs [2,600 fps], MAX 68.3 grs. [2,900 fps] with a C.O.A.L. of 3.260". Running Sierra's MAX load through QL, it shows 2,853 fps @ 53,172 psi at 3.260" C.O.A.L.