Range Report "New" FGMM-175 vs "Older"

[tspearsrph]

Shot some 1000 yd .308 today with 175 FGMM, some with newer brown box,
some with the older blue/white box. The brown box required 3 more minutes of elevation than the blue/white box.....same conditions.
Anyone else experienced this?

Tom

 

[calling4life]

Re: "New" FGMM-175 vs "Older"

Take a picture of these boxes...

I've ran a good bit of federal gold medal, I've got 10 cases waiting for me at my brothers.

The boxes are their normal red federal premium boxes, I've never seen or heard of what you're describing.

Maybe I'm misunderstanding you

 

[mlw332]

Re: "New" FGMM-175 vs "Older"

i have both boxes but i really have not shot them side by side to see a difference

 

[tspearsrph]

Re: "New" FGMM-175 vs "Older"

today:

"old" FGMM blue/white box = 2651 fps
"new" FGMM brown/red box = 2578 fps
. M118LR = 2706 fps

This is what I meant in first post.

Tom

 

[Pusher591]

Re: "New" FGMM-175 vs "Older"

Wow, that's significant. 70fps loss sucks.

 

[mlw332]

Re: "New" FGMM-175 vs "Older"

wow that is a big difference... glad to know this now rather than getting pissed on the range

 

[Txmxracer]

Re: "New" FGMM-175 vs "Older"

I have some brown box that chrono's 2515 out of my 20"gas gun and 2550 out f a 24" FN SPR. Seems kinda slow but my dope was right on.

 

[George63]

Re: "New" FGMM-175 vs "Older"

2650 has been the standard for 308 FGMM, black hills etc. why would they want to F it up?

 

[tspearsrph]

Re: "New" FGMM-175 vs "Older"

Good question, George63. I went to a precision rifle class and took some of "new" FGMM. One of the first things we did was
chrono our rifles. Mine was 75fps slower than the "blue/white" box I have been shooting for years!!! Thought the chrono must be off, but the new dope was right on. Clocked them side by side when I got home (results above).

Does anyone have inside info at Federal to address this?

Tom

 

[turbo54]

Re: "New" FGMM-175 vs "Older"

There are two FGMM 175s; the 308, and the 7.62x51...

Is the "new" stuff you're talking about say 308 or 7.62x51? For whatever reason, the headstamps are different too. The 308 says FC, and the 7.62x51 just has two numbers denoting year of manufacture.

I would guess the x51 stuff would be slower, as SAAMI allows for higher pressure in 308. I would guess the x51 stuff is GTG in any M1A or military rifle, whereas the 308 might be a bit warm and hard on op rods...just guessing though.

 

[GunKnowledge]

Re: "New" FGMM-175 vs "Older"

Haha, I opened this thread wondering why I didn't know what the new FGMM was.

I feel like it's been forever since the current brownish box has been out, haven't seen the silver box stuff in retail for quite a while now.

Can't believe you guys are just now discovering it. You guys must have hoarded a LOT of the old stuff.

 

[GunKnowledge]

Re: "New" FGMM-175 vs "Older"

Just checked Federals website, you guys may want to share your lot numbers.

168gr .308(7.62x51) MV is claimed at 2650
175gr .308(7.62x51) MV is claimed at 2600

Federals website doesn't differentiate any specs between the .308 & 7.62x51 loadings.