Thread: Muzzle Velocity in a Semi vs Bolt action

The only other thing I can think of is that the gas bushing. Change I did has led to the block not sealing as it should so I might be losing more gas than i realise. Will load up and have another shoot today.

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Problem solved. Too close to chrony so it must have been reading gas or powder interference. 2160 fps avg is much more like it.

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Yeah i had an f1 once, purchased one of these:

http://www.amazon.com/Competition-El.../dp/B0028MTBJ4

Problems solved

Our pistol club purchased an F1, needless to say it no longer gets used.
We found it didn't like being used anywhere near the shelter over our seating area,

And funny enough we all now use the Chrono linked above, as owned by a club member

I think the mini 30 has a 308 barrel not a true 312 like 7.62x39 should be. They have done that so you can use 308 projectiles when reloading but it could also be effecting the velocity. I agree with everyone else though - the chrony is giving you false readings.

Slightly off subject but I use 308 projectiles in my 7.62x54 nominal bore .310 same as the m43 7.62x39 way better selection and no drop off in accuracy or velocity I can measure unless using boat tails.

Originally Posted by MassiveAttack

I think the mini 30 has a 308 barrel not a true 312 like 7.62x39 should be. They have done that so you can use 308 projectiles when reloading but it could also be effecting the velocity. I agree with everyone else though - the chrony is giving you false readings.

Very first one were 30cal hence Mini 30.
http://www.brownells.com/GunTech/Rug....htm?lid=15904

Originally Posted by MassiveAttack

I think the mini 30 has a 308 barrel not a true 312 like 7.62x39 should be. They have done that so you can use 308 projectiles when reloading but it could also be effecting the velocity. I agree with everyone else though - the chrony is giving you false readings.

The earlier mini 30s had a .308 barrel which had a smaller outside diameter also. Recent models like mine are .310 internal.

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My F1 is fine, follow the instructions.
I always extend it to the max length of the cord attached to the panel (around 12'). I always use the cover in sunny weather.