Home Forums Lever Action Central Big Bore Levers question on reloading for the 375winchester

I was looking in ken waters pet loads and found the following for a 200grain jacketed softpoint:
he using a 200grainwinchster, but showed a charge weight of 33.5 grains of imr 4198 for velocity of 2105.

Now i went to hodgdens on line site and for a 200grain sierra jfp i show a charge weight using h4198 of between 35grains and a compressed load of up to 38grains. I know the powders are close but not the same, but that much difference?
Waters also shows velocity at 2105 the highest velocity handload with the 200grain winchester using 33.5grains of imr 4198,
yet hodgden is showing with their starting load of 35 grains of h4198 velocity of 2288fps and max of 2480. I am wondering as much as anything about that hodgden suggested range.
Any thoughts?

I would stick to whatever the published data says as I'm guessing it's tested pretty thoroughly before they put it out,even though it might not seem to be correct. Unless your able to check your own loads with a chronograph.

H4198 and IMR4198 are next to each other on the powder burn rate chart, with the Hodgdon being the slower of the two. To me this means the two powders are interchangeable, but obviously use caution and slowly load up to the max when using data for one or the other.

I don't agree on the interchangeability. As you point out the H version is slower. Load density is different too. One is also extremely temp tolerant, where the other no so much.

One is also made in Australia, half a world away from the other. This is one reason the H version is called AR2207 here, to stop it being confused as interchangeable.

The advice to work up before interchanging data is sound.

over the years I have found several mistakes in published data. 180 gr data listed under 150 gr bullets and vice versa. it always pays to question things that seem wrong.

That's a great cartridge.

You will find that in published data occasionally.

Some powders behave differently with a full case or a compressed charge. I'd do what you are supposed to do. Start out on the low end of the suggested data and work your way up - looking for pressure signs.

And as many would agree, look for the most accurate load, not another 100 fps. The target won't know the difference.

Better safe than sorry. Good luck.