H1000 max load in 300 win mag

[SUIScide]

I'm trying to work up a load for my 300 win mag using 208 grain A-max, H-1000, nosler brass, remington magnum large rifle primers. The coal is 3.598" = about 0.02" off the lands. Shooting it out of a remington 700 w/ the 5R 24" barrel and a TBAC suppressor. Right now I'm using 77.5 grains of H1000 but it's not compressed due to long coal. I'm getting moa accuracy w/ this set up to 300 Yards (haven't tried any further) but only about 2600fps. My big question is, as a rule w/ this powder and bullet combo does the maximum load usually have some compression? Like a load density of 105%? I've reloaded for years but I've never tried to work up a maximum load. With 77.5 grains the primers aren't at all flattened. Of course any increases I make will be 0.1 to 0.2 grains at a time but I'm wondering how much further I have to go.

 

[sakobob]

Re: H1000 max load in 300 win mag

just wondering if you used a chrono or actual drop to get that fps
seems pretty slow . my loads are slightly compressed at 76.5 with federal brass.
if your certain about your fps i'm at a loss, said charge runs 2900 out of my trg.

 

[SUIScide]

Re: H1000 max load in 300 win mag

I used actual drop. I'm wondering if the short barrel has something to do with it

 

[fargo007]

Re: H1000 max load in 300 win mag

2" of tube is not going to cost that much fps. Something else is amiss. 77.5 should be closer to 3k.

My load is 2925fps with a 208 A-max, hornady brass, CCI magnum primer, and 76.0 of H1000 from a 26" tube, stood off the lands .005.

--Fargo007

 

[SUIScide]

Re: H1000 max load in 300 win mag

Maybe I'm not calculating my drop right. I sighted in at 91 yards and it dropped 10.5 inches at 266 yards (my cousin stepped off the range, man I wish he had a rangefinder). Fargo007 is your load compressed? Mine isn't. I can hear the powder bairly rattling. I guess since I'm not getting any pressure signs ill keep creeping up on the charge weight

 

[sakobob]

Re: H1000 max load in 300 win mag

i would double check your scale (probably did but throwing it out there).
federal and nosler are real close in volume and at 77.5 i'm compressed in the federal.

to get good dope you need some more distance, 600 and 1k are ideal, not always
available tho .
you may want to try backing the powder down and jamming them .010 and work up SLOWLY from there.

 

[SUIScide]

Re: H1000 max load in 300 win mag

Why seat into the lands, for velocity or accuracy? Sakobob what's your coal with your 77.5 grain load?

 

[sakobob]

Re: H1000 max load in 300 win mag

in the lands for accuracy and when you find your max pressure any thing less in oal will be safe providing you don't change the combo.(anybody fell free to correct me if my thoughts are incorrect).
there is a excellent write up in a sticky at the top of this section.
my oal is longer then most and may not fit in your gun, you will need to find what your rifle likes.
o and i can't run 77.5 it is to hot in my gun ,and yes i tried it, that primer pocket wont hold another primer ever again.