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 steel case velocities in the AR10 (MFS/SB/Tula/Herters)
TaylorWSO  [Life Member]
10/10/2011 11:09:21 AM
I finally got to shoot some of my steel cased ammo. I wanted to do a test to mainly see if MFS was as good as SB. I also threw in some Tula/Herters for comparison. 17.5" AR10, with rifle gas system. I have shot a ton of ammo threw it and I use it for my velocities in my other postings in here.

The velocities/Stan devs 20 rd strings 65 degrees/3200msl

MFS: 2584/ 18.3
SB=silver bear SB: 2651/ 24.5 (this is a match to previous outings)
Tula 2581/ 19.9
Herters 2590/ 16.2
81 FN Nato brass cased 2616/ 18.9 (this is a little faster to previous outings)

What happened:

Surprisingly I got some FTEs with my MFS. I had shot a ton of steel SB ammo/some tula the day prior with a can and did not clean the chamber. I cleaned the chamber then ran the SB which was fine. Ran a couple of the Tula, got 3-4 rounds between stuck casings. Same for the Herters. I stopped shooting and inspected the chamber, it was bad. I had to take a brush to the bore to clean all that crap out. I usually shoot SB with no problems and this was the first time (and last) shooting the "wolf" style 308. I also had 500 rounds of the MFS go threw a HK21 with no problems.

What I learned: I will not shoot herters or Tula again. The SB has enough power that when its gets dirty it still extracts fine. The MFS is a little slower. The cases and loading of the MFS and SB are exact except for the "MFS" stamp on the base of the case. I did not get to weight the powder/bullet.

MFS will probably stay in the HK21 for the price, with SB being my AR10 plinking round.

I would recommend the MFS, but not the herters/tula
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Silent_Dan  [Member]
10/10/2011 6:15:01 PM
Thank you for sharing that.
Good stuff.

I am not familiar with SB steel cased.
Is that the same ammo that is in the green boxes?
TaylorWSO  [Life Member]
10/11/2011 10:04:14 AM

Originally Posted By Silent_Dan:
Thank you for sharing that.
Good stuff.

I am not familiar with SB steel cased.
Is that the same ammo that is in the green boxes?

SB=silver bear
CBR900  [Member]
10/13/2011 5:03:02 PM
Bullet weight?
TaylorWSO  [Life Member]
10/14/2011 9:33:35 PM
all the standard 145/147 fmj
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