"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Interesting. I watched a video (Johnny's reloading bench), and he mentioned that FGMM changed from RL15 to IMR 4064 to get more temp stability. Is it more lot sensitive than most? Oh well, I'll burn through this pound and see what it does. Thanks for the constant helpful input.
ETA: He starts talking about it around 4:36 https://www.youtube.com/watch?v=GEOQATHtKS0
Last edited by czgunner; 01-13-23 at 18:10.
That is very interesting if it's true. We have a fair amount of 4064 and generally only use for gassers. But FGMM is legit and always shoots nicely. I'm excited to see what we get out of my Bolt gun with the 155's velocity wise because our buddy shoots them out off his 13.5 Scar. I hope they are smoking pretty good. Minus trashing brass and popping primers.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
RL-15 was horribly temp sensitive than 4064 in the military tests for the 7.62 LR ammo. I have no idea why they still went with it. It wasn't even close.
4064 does have some lot to lot swings in velocity in my experience. Anymore these days, you can't buy just 1lb of powder and run it. If you can't get at least 5-8 lbs of a given rifle powder, forget it.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
I have had decent results with TAC in my PA-10 using the Speer 125 gr TNT bullets (cheap and accurate). IMR-4064 is what I run with 168 gr Nosler BTHP’s in my bolt gun. I just scored some factory IMI 175 gr OTM ammo from Midway and plan to try some tomorrow in both to see if it might be worthwhile to try some heavier bullets. My attempts with TAC and heavier (150 - 168 gr) in the gas gun weren’t great, but I haven’t really tried IMR-4064 in it yet.
4064 should treat you just fine with heavier bullets. Better powder in general. Good luck.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
The only downside with 4064 is the kernels are long cut rice. I tried running it once in my Dillon 550b and it was a mess. Chargemaster only for me with 4064.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Hard to find I would think but in my M1a I used and loved IMR 4895 ! 42 grns and a 168 Nosler or Sierra and it always shot sub-MOA in my Fulton NM. AR style could be different I'm sure.
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