800X

[aurora40]

Hornady #9 had 38 and +P data for 800x with their jacketed bullets

 

[STORMINORMAN]

Uh...

STORMINORMIN;

correct, the 357 158 lead with 8.9g 800x at 36k cup is a listed data.

the 38 158 swc list "x" amount of 800x for 880fps at 16,000cup....
but they also list 9.7gr of 4227 at 825 fps at 15,700 cup.

In my 6" 686 with a 38 spl. case, a 158 lead needed not 9.7 grains of powder, but 11.0 grains to get 888 fps.

One reason I can not post my load, since it is over the IMR data, with the 800-X powder.

16,000 cup is a long way from 18,500 cup or 20,000 psi ......
but without the tools, or more data, you will have to settle with a "Standard load".

Ed: Yep, the book load for a 158GR LSWC is 5.9GR 800-X for 880fps @ 16,000 cup and an COL of 1.550". Your 4227 load example indicates an increase of another 10%+ to get a small increase in fps, but hardly in the range of typical(?) +P velocities (i.e., North of 1,000 fps).

Recognizing that these are different powders is an initial 10% increase in 800-X a ballpark starting point vis-a-vis developing a +P loading, using a .357 Magnum (BlackHawk) as the test weapon?

 

[Nevada Ed]

Yes I hate it when the company stops at 17,000 pressures for the 38 special.
Safe is nice but a lot of newer weapons can take 18,400 all day long but I do understand
why it has to be that way.

I am just glad I have a 686 and a chrony to test all my heavy 38 loads before they end up in my J frame.
Taking in the fact that fast and slow powders give out different pressures during the fps gains.

I loaded 43 years without a chrony, just let the weapons talk back to me. Now, with a chrony, fear has almost left me with high pressure loads but a load going to another weapon does add a little rise in my heart beats, until they prove themselves.

Stay safe.

 

[SmokelessPowder]

It's a useful powder, but meters poorly, so I look for others when I want a powder in that burn range.

It meters just fine in my Dillon. I was initially worried about using it but not anymore. Works well enough in 45ACP with 230 ball.

 

[rsrocket1]

I just shot 50 rounds of 9mm using 5.5g 800-X under a powder coatet Lee TL356-124-2R through my M&P 40 with a 9mm barrel and mag. Excellent performance. Good recoil, no wimpy case ejections hitting me in the head and clean, non-sooty cases with no signs of over pressure.

I last tested this 11 months ago and with the 120g Lee TC bullet, I was getting 1070 fps with the same charge. The temp that day was 72F and the temp today was 87F so the speed was probably very close. The RN bullets were seated to a COL of 1.149" or a seat depth of 0.195". The top tumble lube band was above the case rim and the bullets were sized to 0.356". I found that if I lift and snap the powder measure rotor meter while the cavity is pointing into the powder, I can get the drops to be consistent to within +/- 0.1g. If I didn't do this, sometimes the powder bridged and I would see a very low charge in the case (as low as 2-3g).

Here is a picture of what 5.5g 800X looks like next to a 9mm case. Yes the flakes are almost as big as the primer hole.

 

[joe44va]

Works well but loads have to be fairly stout or there is a lot of unburned powder left behind.