My dad just bought a 338 RUM, but I do all his reloading, Rem Sendero Stainless-fluted barrel. Does anyone have one of these animals? (his is magna-ported). what powders should I start with? Hogdon just came out with a "retumbo" looks ok for velocity, but accuracy? Hoping for a MOA shooter. Any ideas are appreciated in advance.

Hi,had good luck with Reloader-25.Looks like it is best with heavy bullets. 250 grain plus. I shot some 250 grain Hawk bullets semi round nose with 80 grains of powder and got .411" groups.Got up to 90 grains and the groups were opening up to about 1 1/4". I think Reloader-22 may be great with lighter bullets.

I shoot nothing but Re-22 in mine,but the 210XLC is the heaviest projectile I employ.............

RL22/////RL25/////IMR7828/////4831//////

I have the same rifle/caliber and it's an excellent shooter. I would add H1000 and H870 to the list, though they work better with the heavier bullets, 250 grains and up.

I shot my rifle for the first time in awhile last weekend and with the 300 MKHP/Rel25 it produced a .280" 3 shot group @100 yds, for zero. I moved the target out to 225 yds and through a heavy mirage and gusty swirling winds, I shot 3 shot groups that went 1.10", 1.30", 1.90", 1.25" and 2.10". It was easily out-shooting my .223 in that wind. I'll bet your father will like his new toy and it shouldn't kick much being Mag-na-Ported.

Good luck

With 250 grain bullets, try RE-25.

So far, IMR-7828 is the best with 200 grain bullets.

Reloader 22 ought to work with the 200-225 weights but I seem to be snake-bit with Re-22. I never seem to have much luck with it.

Good luck, Joe.

92g of RL25 over the 250g Sierra Gamekings gives me a .250 3 shot group at 100 yards , 3030FPS. 90g of RL25 over the CT Partition Golds "Moly Free" gives me .75 groups at 100yards, 2950FPS. Very consistant velocities, in a string of six shots, 3-4 will have the same velocity. Gun is a Krieger barreled Remington action.

Generally I have found AA-3100 to be the best powder for all around use. Data is available on my pages.

H-1000

Vit.N-560 and H-4831SC are the 2 best powders in my rifle. They work great with bullet weights from 160grX up to 250gr A-Frame. Adjusting OAL makes a huge difference in accuracy with mine.Good luck

Retumbo.............

Remington 700 BDL custom deluxe(muzzle break added),case Remington,federal 215,H-4831sc 95grs (.706 MOA ),COL 3.600",trimming 2.751",bullet 200 grs Hornandy sp interlock(3310).I will try 3.575".Playing with COL make a difference...

Try IMR-7828 or REL-25 in your 338 Ultra Mag. Both powders are ideal for the large Ultra Mag case. REL-22 and IMR 4831, H-4831 should do well with the lighter weight bullets. Always begin with the starting load listed in your book or you may pass the accuracy load in that Magnum cartridge. Few hunting rifles produce their best groups with the maximum loads listed.

The best I can do is.555MOA,the rifle can shoot better than me One think I wont do is to sell that rifle,a fine shooter will be able to get less than.500MOA.Concerning the price is was a good buy,is anyone else getting fine accuracy with the model BDL custom de luxe...

AA-3100

Thank Stephen for your web site...

Has anybody tried VV 165 or 565 in the Ultra Mag?

I've had good luck using 3100, decent load densities, good velocity, good accuracy at about 92 grains behind a Nosler 200 BT (decent deer load) and the recoil isn't too bad.

Vithavouri N560, Norma MRP. And N160 on light bullets.

I havent tried MRP2 , and N165, N170, yet. Has anybody else some data on these powders?

[ 12-30-2002, 20:15: Message edited by: 460wby ]