Full Length vs. Neck Sizing Pressures
Is there any way to estimate the pressure change going from a full length sized case to a neck sized case? I was wondering if this could have a significant affect on muzzle velocity?
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RE: Full Length vs. Neck Sizing Pressures
Shouldn't be significant for sure.
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RE: Full Length vs. Neck Sizing Pressures
ORIGINAL: Sling Is there any way to estimate the pressure change going from a full length sized case to a neck sized case? I was wondering if this could have a significant affect on muzzle velocity? Try this: Take one of your fired cases and FL resize it. Then weigh it, fill it with water, and weigh it again. That'll tell you the case capacity in grains of water when FL sized. Next, dry it well, reload it and fire it. Nowweigh it again. Then size the neck only,fill it with water again, and weigh now. How much more water does it hold now vs when FL sized?? Any difference you can detect with your powder scale? I'll bet the difference will beless than 1 grain of water............ (the reason I suggested using the same case twice is that the weight difference between two apparently identical cases can be enough to invalidate the comparison. Additionally, the water capacity of the "identical" cases may be different as well.) |
RE: Full Length vs. Neck Sizing Pressures
You really won't see much difference in velocities, but you will see your velocity spreads go down and more consistent velocitieswith neck sizing only. And even that might be slight.
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RE: Full Length vs. Neck Sizing Pressures
ORIGINAL: bigcountry You really won't see much difference in velocities, but you will see your velocity spreads go down and more consistent velocitieswith neck sizing only. And even that might be slight. |
RE: Full Length vs. Neck Sizing Pressures
ORIGINAL: eldeguello ORIGINAL: bigcountry You really won't see much difference in velocities, but you will see your velocity spreads go down and more consistent velocitieswith neck sizing only. And even that might be slight. I always contributed it to my F1 chrony. |
RE: Full Length vs. Neck Sizing Pressures
ORIGINAL: bigcountry ORIGINAL: eldeguello ORIGINAL: bigcountry You really won't see much difference in velocities, but you will see your velocity spreads go down and more consistent velocitieswith neck sizing only. And even that might be slight. I always contributed it to my F1 chrony. |
RE: Full Length vs. Neck Sizing Pressures
The difference in powder capacity was mentioned. However, what about the room for case expansion in the chamber. A full resized cartridge should have a little room to expand in the chamber and a neck sized one will have none. Could that make a difference?
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RE: Full Length vs. Neck Sizing Pressures
ORIGINAL: BarnesX.308 The difference in powder capacity was mentioned. However, what about the room for case expansion in the chamber. A full resized cartridge should have a little room to expand in the chamber and a neck sized one will have none. Could that make a difference? |
RE: Full Length vs. Neck Sizing Pressures
Velocity is definitely proportional to pressure(obviously). IMO your question depends on each individual rifle. As stated above the difference is minimal. The major difference is obviously going to be case capacity when it is neck sized. Tom.
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