223 velocity
- Thread starter jnr88
- Start date
Something is amiss, 90gr. Berger VLD, 24.5 Varget makes 2870 fps out of a 30" Krieger.
I used 2790 as a guesstimate for MV and put the 80.5 into Strelok
jelenko
Gold $$ Contributor
Barrel length?
jnr88
Silver $$ Contributor
Thank you. I didn’t know Strelok could do this.
Once you have your load setup in Strelok-
In the list of icons near the bottom of the main screen, click the top right one that looks like a grid/table.
When open, click the settings gear on the bottom left, enter the distances and check the boxes for the data you would like to see. Click OK and the table should appear in your desired format.
The velocity shown by a Shotmarker, may not be the actual velocity. They are accurate shot to shot on any given day, but different Shotmarkers or on different days, will give different velocities. It is a fun number to have and play with but not good for much.
liseo
Silver $$ Contributor
Whats your OAL? The primer remain tight with this velocity?
Ned Ludd
Silver $$ Contributor
I used a load with pointed 80.5s in 300 yd F-Class matches for some time. I was getting ~2860 fps from a 26" 7-twist barrel, not too different from your setup. The first JBM ballistics output is for my 2860 fps load (80.5 1). I then dropped the muzzle velocity 100 fps to 2760 and obtained the second output (80.5 2). At a predicted velocity of 2239 fps, it's very close to the ShotMarker velocity output you reported from the target face.
As has been noted by others, the velocity values reported by e-targets may not always be correct. In fact, they can vary quite a bit. The velocity you reported seems a bit slow to me for 24.0 gr of Varget. It might have something to do with the ShotMarker velocity value. If you are not pointing bullets like I did, the 80.5 G7 BC would be about 4% lower (i.e. about 0.228 instead of 0.237). That would be worth approximately 20 fps velocity at 300 yd. Nonetheless, 2240 fps is the velocity you have to go on as reported by the ShotMarker. That indicates a muzzle velocity of about 2760 fps with pointed bullets, or 2780 fps if you are not pointing the 80.5s.
If you wish to pursue this further without the actual use of a chronograph, I would suggest running whichever of those two predicted mnuzzle velocities is appropriate through a ballistic calculator, then comparing your actual scope elevation setting changes between 100 and 300 yard (i.e. your drop at 300 yd) to the predicted drop at 300 yd for that muzzle velocity. Comparing your actual drop to a predicted drop for a given muzzle velocity should give you some idea of whether the ShotMarker target velocity value was accurate.
As has been noted by others, the velocity values reported by e-targets may not always be correct. In fact, they can vary quite a bit. The velocity you reported seems a bit slow to me for 24.0 gr of Varget. It might have something to do with the ShotMarker velocity value. If you are not pointing bullets like I did, the 80.5 G7 BC would be about 4% lower (i.e. about 0.228 instead of 0.237). That would be worth approximately 20 fps velocity at 300 yd. Nonetheless, 2240 fps is the velocity you have to go on as reported by the ShotMarker. That indicates a muzzle velocity of about 2760 fps with pointed bullets, or 2780 fps if you are not pointing the 80.5s.
If you wish to pursue this further without the actual use of a chronograph, I would suggest running whichever of those two predicted mnuzzle velocities is appropriate through a ballistic calculator, then comparing your actual scope elevation setting changes between 100 and 300 yard (i.e. your drop at 300 yd) to the predicted drop at 300 yd for that muzzle velocity. Comparing your actual drop to a predicted drop for a given muzzle velocity should give you some idea of whether the ShotMarker target velocity value was accurate.
2.6350", still have room for more powder if it would help but don't need it, it out shoots me every time.
No pressure signs, loose pockets or I wouldn't be using it or broadcasting the load, Win., LC (Fed) and Lapua brass (Dakota marked).
Using same load in a 31" CLE Space Gun upper and have never checked the velocity loss.
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