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11/22/2017 10:05:29 PM
Posted: 9/22/2004 10:24:07 AM EST

Did I hear right that it is not a good idea?

(1/9 twist or faster)
Link Posted: 9/22/2004 11:42:36 AM EST
M855/SS109 is 5.56mm ammo and most match barrels have chambers that are .223 and on the tight side at that. If you're match barrel has a Wylde chamber such as the RRA varmint barrels then you should be okay but you are likely to have reliability issues otherwise.
Link Posted: 9/22/2004 11:56:27 AM EST

I guess my most major concern is wearing out the rifling rapidly since the bore is tighter and using heavier bullets.

Does 62 gr. or M855 or ss109 or whatever use more/denser powder to move the heavier bullet better?
Link Posted: 9/22/2004 12:23:47 PM EST
I was testing my feedramps on this rifle with M855/SS109 and it would not fully chamber any of the rounds I tried. This has a tight match chamber, which I confirmed through email conversations with people at White Oak. Something about the ogive (curve) of the bullet that contacts the throat of the chamber and doens't allow them to chamber fully. They would have not worked at all in this rifle, but it was all I had at the time. I have since exclusively shot 69gr and 77gr SMKs out of it with no problems.

Link Posted: 9/22/2004 12:37:39 PM EST

Omg, another fine use for the wife's exerise stepper!
Link Posted: 9/22/2004 1:42:11 PM EST

Originally Posted By BeetleBailey:
Omg, another fine use for the wife's exerise stepper!



Link Posted: 9/22/2004 4:21:50 PM EST

Originally Posted By BeetleBailey:
I guess my most major concern is wearing out the rifling rapidly since the bore is tighter and using heavier bullets.

They all use a 0.224" bore and most match ammo is heavier than SS109, so...

The chamber itself is tighter and a match barrel has a limited service life before accuracy starts to degrade. That life is measured in the number of rounds fired through it and it doesn't matter if those rounds are a bunch of cheap milsurp ammo in a few afternoons or handloaded match ammo over the course of a few years. Looking at it from that point of view it would obviously be stupid to waste the life of a good match barrel with just going out and plinking. If you want something for a bunch of rapid fire shooting you should get something chrome lined from Bushmaster.


Does 62 gr. or M855 or ss109 or whatever use more/denser powder to move the heavier bullet better?
Military ammo, both M855 and M193, is loaded fairly hot, but even then we're still talking about 5.56mm. The really hot stuff like .22-250 or those new .223WSSM will have issues with throat erosion.
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