Hanging out with Grandpa-in-law the other day and out of his old powder refrig, in the corner of his barn we pull out a jug of powder he recalls sealing up in 1961, Improved Military 4350. I had asked him for some to try and brought out some containers so he pried off a masking tape seal around the lid of a plastic jug, remembering about '61 was when he got a Jag of this stuff at surplus prices and was the last it had seen light of day... Very Near 50 yr old powder! Has Been stored in an old refrigerator, not cool, just isolated from temp fluctuation to some degree.
Smells exactly the same as Fresh stuff, pours really nice, looks good so, as it is quite a bit of free powder, (he gave me four lbs+) I want to figure a use for it vs. just burning it in a pile which is what I heard him mention the other day.
So loading up some fresh IMR 4350, (according to Propellant Profiles this is the equivalent in todays powder and I am 100% sure it was labeled correctly tho not in original cans) I tagged a couple rounds of this 1961 stuff (marked batch 60) as following three shot groups of Fresh IMR 4350 and let 'em fly,
Thought this might be interesting and maybe you guys can give some advice on how to use it, all the stats are on the targets, notice both the POA drop and especially the velocity drop in these lot 60 rounds but also that the group is not all over the place, Hmmm not too bad, I guess
Well, all the stats are not there, these were Speer 100gr Varmint HP bullets, .270wsm, 2.875col, and using Fed215's, a 45F day and very humid, slightly windy, and I'm definitely not great shooter but, it looks like definite patterns there, eh?
Isn't it interesting that the velocities are Very Uniform for these Lot 60 loads at least the first six? See the variance figure beneath the Avg vel. (68gr "0"variance, 68.5 "7" var, and 69 "0" variance?) hadn't seen that before, does it mean anything?
So with the poor velocity, (notice it is about 400fps slower?)but somewhat tolerable accuracy, should I just buy some inexpensive bullets and use this stuff for offhand shooting practice with proven loads from fresh powder workups?
Or should I work up loads with this stuff and try to use it otherwise? The velocity drop is the thing that makes me think just use it as practice stuff.
What do you think? Would a different primer, LR vs. LRM make a diffference?