Current Data for W748/760?

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W748/760 powders? Data for older batch of W748 in medium size cases such as 300/303 Savage/308WCF, now causes badly stuck cases when used with latest batch of W748. Rifle is Modle 99 Savage in VG condition - 180 gr. bullets.

Current, up to date data for W748 powder is almost non-exsistant on the web.

Anyone else having this problem?
 
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RE. Current Data for W748/W760

Lyman 49th Ed. was the only source I found listing both mininum and max. loads for W748 in 300 Savage for 180 gr. bullet. Appears to be based on older lot of powder, 37.5 @ 2181 fps. to 41.7 @ 2480 fps.

Hodgdon list one load only, 38.8 @ 2350 fps. as maxinum. I found the same limited information in the Hodgdon 2010 Reloading magazine manual. Apparently the 300 Savage is passe in 2012. The 300 AAC and 30 AR apparently being more popular. I digress ...

My original suspicion that very little published data exsist for either W748 or W760 powders appears to be correct. Speer do mention one load for W760 for the 300 Savage on their website.

As far as something being amiss with the Model 99 barrel or chamber, the firearm is in excellent condition. The bullet is from a trusted lot #. Ditto primer and OAL.

It would have to be a monsterously copper fouled barrel to cause pressures high enough to sevearly stick cases with what had been a very good load. We live in Nova Scotia, so the spring temperatures would be in the 60 to 70 F. on a very warm day.

The only varible appears to be the change in powder lots of W748.
 
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There has been a good bit of lot#to lot# variation with Win748 and Win760 and their Hodgdon counter parts BLC2 and H414. Such that for many years they were treated as entirely different (though very similar) powders... Until Hodgdon took over handling both "labels" as we're told now....

Look at a number of older manuals and you'll see what I'm talking about.

I'd suspect that you've got an older lot# which some were a bit slower burning than current lot#'s.

I had some Win748 in the early '80's that with a .30/06 would push a 150gr bullet to almost 3,200fps with excellent accuracy. (from the Hornady manual circa 1983). I replaced it when I exhausted that container but another lot# and with same powder charge got flattened/cratered primers and very difficult extraction and velocities ran to upper 3,000fps.... almost a completely different powder....
And I've never reproduced the ballistics of that lot#.
 
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