HuntingNet.com Forums - View Single Post - Velocity, ft-lbs accuracy

04-03-2009 | 04:47 AM

#8

Screwbolts

Fork Horn

Joined: Dec 2005

Posts: 320

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From: My Range in Central NY

RE: Velocity, ft-lbs accuracy

This is a post I have moved from a Smokeless board but I think the BC is relevant on this thread.

If you need a tighter fit with the LBTs just knurl them between to files to what ever diameter you would like.

This is a group I fired last Mon. My LBTHC in SBH sabot as cast. Shots 3 and 4 I realized I had changed my hold on the rifle, 1-3 were chronograph at the backstop 4-6 were with the crono at the bench. 103 yards between the chronograph placements readings. BC worked out to .180, adjusted to .178 by weather conditions, this is from Load from a disk program. This load was 6.5 of 5744 not 7.5 as the paper shows. ( LEE .5 CC dipper of 5744 )

These groups were fired from a gun that had been shot 7 times prior to this shooting since cleaning. No cleaning or patching of any kind was done, to shot these groups.

This is a load of 33 gr. of 4759. My LBT HC SBH as cast. Shots 1-3 were read at the bench, shots 4-6 were at the target, only got 1 reading because of to much shade I believe. BC worked out to be .197 adjusted to .195 after all condition data was entered. 33gr. 4759 is almost exactly what 105 gr of BH209 gets for speed. 105 gr. of BH209 reads 1778 FPS

This is a photo from my bench to the 103 yard back stop. 10 cu' freezer full of sand, my 150 yard backstop freezer is behind it but a downed tree has tipped it off its mount so it isn't visible. I need to remove the tree and reset the freezer.

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