125 GR Sierra MatchKing Bullets
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OFFHAND, I don't know why it would NOT work. One thing I'd wonder about is if the M1A rifling twist, which is optimized for 147 - 175 gr. projectiles, will stabilize the lighter projectiles. I'm also guessing you'd have to push them pretty fast, if you hope to operate the action. I did a quick search over at the Hodgdon reloading site, and most of the data I found, using service-rifle friendly powders, involved compressed charges. The exception, H335, might be the powder to work with.
I don't know what rifle powders you might have on hand, but if they're near the 4895s, you might try a work-up with those.
I don't know what rifle powders you might have on hand, but if they're near the 4895s, you might try a work-up with those.
Have tried 125 Nosler Ballistic tips, and they gave surprisingly good accuracy and velocity with 748 (cci 34 primers). The socom owned has a slow twist, common to the standard M1A? Strongly advised to load dummy round, and cycle from bolt lock back. Likely you may find the bullet pulls out slightly from the cycling process. That may or not concern you, depending on your purpose.
Bought some hdy 125 sst's to try in various 308s, as they have a cannelure.
The poi may need to be adjusted, again depending on your purpose.
Bought some hdy 125 sst's to try in various 308s, as they have a cannelure.
The poi may need to be adjusted, again depending on your purpose.
Kosh-that would be it, including setting the full dia of bullet out further for better accuracy. Not mentioned was that included not expanding the case necks after sizing. Was expecting the opposite, as in bullet set back.
Have the same scenario in some specific pistol loads, like the .380.
Have the same scenario in some specific pistol loads, like the .380.
I shoot 125 TNTs a lot through a M1A Supermatch w/ 1:12". I use IMR4895 (I think maybe a half grain more than I'd use behind a 168 worked out well). It cycled just fine even down to around 39.0grs. Make sure you keep approx one caliber's worth of bearing surface inside the case mouth. I use 2.75" with the TNT, which is a little longer than what they recommend (2.7 if I recall), but after something like 2k of them fired, I've never had an issue. Cheap bullet, not fussy in the least, and brutally accurate.
10rds
As long as you have enough bullet in the case mouth, the bullets shouldn't move much at all (on the order of 0.005"). If they are moving, then you have inadequate neck tension (a die problem).
10rds
As long as you have enough bullet in the case mouth, the bullets shouldn't move much at all (on the order of 0.005"). If they are moving, then you have inadequate neck tension (a die problem).
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