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  #1  
Old 09-13-2014, 4:22 PM
jlane jlane is offline
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Default Reloading. 308 with 165Gmx and IMR4064

I'm reloading. 308 with 165gn GMX with IMR4064 powder. Anything over 41gr of powder seems to be a compressed load. The bullets are roughly. 25 inches longer, has anyone tried this or has a good recipe for the copper bullets?
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Old 09-13-2014, 4:35 PM
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IMR4064 is a long stick, extruded powder and is bulky to load. When you're pouring the powder in the case use a long (6" or longer) funnel. This will help the powder pack better in the case.

I use IMR4064 in my 375 H&H with Barnes 300 grain bullets and I wind up compressing the powder charge about 1/2" even using the long drop tube.

For my 308, I've been using 44 grains of IMR4064 with the Hornady 165 grain BTSP for over 30 years.
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Old 09-13-2014, 4:43 PM
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Thanks, I thought I might have been doing something wrong. I had a friend suggest tapping the cartridge to settle the powder. And I'm not trying to hotrod the loads, my goal is accuracy.
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Old 09-14-2014, 1:45 AM
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Quote:
Originally Posted by jlane View Post
Thanks, I thought I might have been doing something wrong. I had a friend suggest tapping the cartridge to settle the powder. And I'm not trying to hotrod the loads, my goal is accuracy.
I use 44.4gr of IMR 4064 with a 168 SMK.

For accuracy, it's actually better to compress the sticks a little bit. This makes for a more consistent burn as they'll be under tension so they won't move around and they will occupy the same volume from cartridge to cartridge.
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Old 09-14-2014, 4:33 AM
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What OAL with the 44.4?
I'm at 42.0 grains with 2.80 OAL and R P or CBC brass.
WLP and same 168 gr. SMK

I'm happy with the 42 gr but haven't chrono'd it yet. Do you have an fps on that?
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Old 09-14-2014, 8:33 AM
jlane jlane is offline
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I'm running the OAL to 2.80" and the cartridges are R -P. If you measure the Hornady GMX 165 gn against a nosler or Sierra bullet of the same size, you will notice a considerable length difference. I'm assumming this is because copper weighs less than the lead equivalent. I don't want to create too much pressure in the gun. Its an old model 88 lever with the rotating bolt.
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Old 09-14-2014, 9:29 AM
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Do you have any room in the magazine to load longer?
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Old 09-14-2014, 9:54 AM
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I have about .074" space to fit the cartridge into the magazine, which puts me right the first canullar groove. When I load a dummy round to 2.871" it fits and doesn't engage the rifling. I'm assumming this is doable as long as everything cycles smoothly with no interference.
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Old 09-14-2014, 10:06 AM
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Quote:
Originally Posted by Pauliedad View Post
What OAL with the 44.4?
I'm at 42.0 grains with 2.80 OAL and R P or CBC brass.
WLP and same 168 gr. SMK

I'm happy with the 42 gr but haven't chrono'd it yet. Do you have an fps on that?
I use 44.4gr, FC brass with .335" neck bushing, OAL of 2.80". It runs me 2,765-2,770 fps in a 24" barrel.
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Old 09-14-2014, 10:21 AM
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Bottom line is, its probably why Hornady doesn't list this powder in its recipe. I'm just thinking outside their box, as reloaders do.
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Old 09-14-2014, 4:48 PM
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Quote:
Originally Posted by jlane View Post
Bottom line is, its probably why Hornady doesn't list this powder in its recipe. I'm just thinking outside their box, as reloaders do.
I don't know why they wouldn't. 4064 or Varget would seem to be the way to go unless you are not weighing individual charges.
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Old 09-14-2014, 5:52 PM
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Its clear I need to get out my chronograph on this. Been working up .308 loads based on function for the semi autos and groups for the bolt.
The 42 grains have worked nicely in the 18" and 24" semis, both LR 308 pattern and the rem 700 has a 20" bull barrel.
Will be interesting what fps I get out of these.
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Old 09-14-2014, 6:22 PM
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All rifle target or hunting loads are individually loaded. The pistol cartridges are the only ones I may go every ten, then recheck the powder charge. These rifle loads are for hunting in California in a no -lead zone. I'm just trying to get ahead of the curve. In 2016 rumour has it ALL hunting rounds will be lead -free.
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Old 09-14-2014, 6:32 PM
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Keep in mind this bullet is a flowering copper bullet. The GMX is approximately .241" longer than the other 165/168 gn bullets of the other vendors. Punching paper isn't an issue, but this bullet is a quandary as far as the hunting game is concerned.
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