Fgmm 308/175

[Brux]

Has anybody bought any of this lately and if so could you tell me what the overall length is.

 

[Uncontrolled Copy]

Measured 10 samples of GMM .308 175. 2.7965" for the lowest OAL and 2.8010" for the highest OAL.

 

[jarhead1077]

Here is 10 samples straight out of box FGMM 175 SMK

175 gr SMK		C.O.A.L.		O.A.L. (ogive)		Bullet Dia.		Bullet Length Base to Ogive		Brass Dia.		Fired Brass Dia.		Brass Neck Dia.		Fired Brass Neck Dia.		Unfired Brass Length		Once fired Brass Length
1		2.800		2.220	*	0.308			*	0.467		0.468	*	0.339	*	0.344		2.009		2.011
2		2.798		2.221	*	0.308			*	0.467		0.469	*	0.339	*	0.344	*	2.012		2.010
3		2.801		2.223		0.308		0.656		0.467		0.468		0.339		0.344		2.009	*	2.008
4		2.803	*	2.229		0.308		0.657		0.467	*	0.468		0.339		0.344		2.012		2.009
5		2.801		2.221		0.308		Overall		0.467		0.468		0.339		0.344		2.010		2.010
6		2.803		2.226		0.308		Length		0.467		0.468		0.339		0.344		2.006		2.010
7	*	2.794	*	2.217		0.308		is		0.467		0.469		0.339		0.344		2.008		2.009
8		2.802		2.224		0.308		1.231		0.467	*	0.468		0.339		0.344		2.009		2.009
9		2.801		2.227		0.308		1.235		0.467		0.469		0.339		0.344	*	2.005		2.010
10	*	2.804		2.224		0.308				0.467		0.468		0.339		0.344		2.010	*	2.013
AVERAGE		2.801		2.223		0.308				0.467		0.468		0.339		0.344		2.009		2.010
Hi/Low Avg.*		2.801		2.223		0.308				0.467		0.468		0.339		0.344		2.009		2.010

 

[JCCinOhio]

I didn't do averages on any of the numbers, but the box I measured a month or so ago of 20 has a coal of between 2.797-2.801", Base-ogive of 2.197-2.202", and base to shoulder of 1.617-1.619".

Of note is I have 2 of the Hornady 8-30 comparators and they are both pretty different, so I have to color code them and make sure I use the right one. On one cartridge for base-ogive I get 2.201" with one comparator, and 2.216" with the other. From my numbers you can see I've been using the smaller one for my ogive measurements, but seems like the big one is more in line with Jarhead above. I had only been using the larger one when checking bearing length (large one for base of bullet) to keep things consistent. Moral of the story is (even though you just asked about COAL) if you are checking base-ogive you are better off measuring your own box of cartridges because it seems there is some variation in the comparators.

 

[Brux]

Thanks for the info.