Powder choices for 30 Carbine

[vintage hunter]

For those that doubt this, you can look at the data on the Hodgdon website and see that the charge weights and pressure/velocity data are identical for both powders.

My Hornady manual shows the same thing. However the two Speer manuals I have shows the max charge to be a grain different. I've seen data from other sources that show a difference as well.

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[no4mk1t]

My Hornady manual shows the same thing. However the two Speer manuals I have shows the max charge to be a grain different. I've seen data from other sources that show a difference as well.

Could be different lots of the same powder. Look at a selection of different manuals and they will all be slightly different for the same powder no matter which powder you pick.

[vintage hunter]

Could be different lots of the same powder. Look at a selection of different manuals and they will all be slightly different for the same powder no matter which powder you pick.

Probably has more to do with varying jacket hardness and bearing surface lengths of the bullet from one brand to the next. Another factor could be slight differences in the bore/chamber dimensions of the test guns used.
Anyway, my point is even though the two powders may be identical in all aspects don't take it for granted the charge weights will be interchangeable for all brands of bullets of a given weight.
Check the data for that particular bullet before loading.

[browningautorifle]

Check the data for that particular bullet before loading

Absolutely agreed.

[enfield303t]

My Hornady manual shows the same thing. However the two Speer manuals I have shows the max charge to be a grain different. I've seen data from other sources that show a difference as well.

I have several reloading manuals and all show different min/max loads for the identical powder/bullet. Look at a older manual and it usually is a much higher max. load than a newer manual, why?? Personally think that companies have serious liability concerns and who knows if their lawyers get involved.

I have discussed this issue with friends that reload and we believe liability must have something to do with it.