Spike Camp

257 Load with IMR 7828

257 Load with IMR 7828
« on: March 16, 2018, 01:37:28 PM »
Need help with working up a load for a 100 Grain Barnes TSX with IMR7828. All the data I can locate only shows a max charge (73 grains) recommendation with no minimum. Iím sure someone here knows why and can point me in the right direction. Thanks!

Re: 257 Load with IMR 7828
« Reply #1 on: March 16, 2018, 09:08:40 PM »
just drop down 5-10% from the max load and use that for your starting load. Personally, I would drop 5% to start.  8)

ultralite-240 Wby
synthetic-240 Wby
synthetic-257 Wby
ultralite-270 Wby
fibermark-270 Wby
accumark-270 Wby
accumark-7mm Wby
stainless-300 Wby
accumark-30378 Wby
fibermark-340 Wby
accumark-338378 Wby
custom-375 Wby
DGR-378 Wby
DGR-416 Wby
custom DGR-460 Wby

Re: 257 Load with IMR 7828
« Reply #2 on: March 16, 2018, 09:20:25 PM »
I agree with Catskinner.Drop down 5-10 % and work up.If It doesn't work well for you I have found that H1000 and 100 tsx are a great combo in the 257.
« Last Edit: March 17, 2018, 02:48:36 AM by terminator »
Faster horses,younger women,older whiskey,and more money.


  • *****
  • 2702
    • View Profile
Re: 257 Load with IMR 7828
« Reply #3 on: March 18, 2018, 04:37:03 AM »
By increasing the load by .3 grains at a time vs .5 you will be closer to hitting the optimal charge for that bullet sooner. The TSXs in my 257 Wby are not picky about the powder (such as H-1000, RL-22 or H-4350) but I seat bullets to the maximum length the full magazine allows and still feed into the chamber.
Of all the gin joints in all the towns in all the world, she walks into mine.

Every man needs to know his limits.

Re: 257 Load with IMR 7828
« Reply #4 on: March 20, 2018, 07:57:12 PM »
Thanks gentlemen. I'm also testing a load with H1000 as well.