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FGMM 175gr Old VS New

JINKSTER

Sergeant of the Hide
Full Member
Minuteman
Apr 11, 2020
146
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E8DD22EB-59E7-4D85-B803-9654939584C2.jpeg
A coworker/friend of mine shared this with me so I’m sharing it here with you folks.

The top string is his old red box 175gr SMK FGMM…the bottom string is Federals recent FGMM 175 SMK’s…both strings shot from his 26” barreled REM 700 Varmint .308
 
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Pull one. Does it look like IMR 4064?

Could be many things. If the old lot was stored in a vehicle, the constant bouncing around and heat cycles can cause the retardant to slowly wear away and increase burn rate, pressure, and velocity. Could be polar sides of velocity/pressure corrections on a test barrel. Could be different powder, slow lot, etc...
 
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I recently chrono’d 2595 fps for FGMM 185 Juggs from a 20” bbl… seeing a 26” run 175s slower is mind blowing to me. The 168 TMK TRU was 2625 or so, the FGMM 168 SMK was 2605 or so. I guess in that context I can understand the 175 numbers (at least from my barrel)… but… why can’t they all be loaded like the 185 Juggs? ;-) For factory ammo so far, as far as reaching out there, I haven’t found anything that’ll touch those 185s. The TAP 168 ELD-M did 2725 fps or so, but that’s not enough at the muzzle… maybe the Superformance match?
 
Approaching 2,700 FPS with the 175s seems to be more of the exception and not the norm.

Many older threads on here have most of the shooters reporting 22-24" barrels running the 175 stuff in the 2550 - 2600 range. Some had crazy high numbers...but what kind of chrono were they running and under what conditions?