.22LR mv and SD

[tangolima]

I did their SV ammo and went back to HV. I have my silly reason. I need something more energetic to kick up the soda can or dust as feedback. Besides if I ever need to hunt a rabbit to feed my family during emergency, it works better.

-TL

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[rc]

If you can find a lot of 22 LR that has a SD regularly below 20fps it's a pretty good lot of 22s. Some of the older Remington ammo would end up being bang, pft, pft, bang, bang with standard deviation over 50fps. If you find a lot of ammo with SD of less than 15 or less than 10 fps, it's a good idea to buy as much of that lot as you can. Having said that, the crimp and chamber you use affects SD as well. Get a very tight chamber that engraves the bullet when you chamber the round and the same exact lot of ammo will generally give better SD numbers...... The worse the crimp, the more important the chamber becomes in producing consistent MV.

[tangolima]

I have just received 1000 rounds of CCI Blazer. Will do some measurements as it shoots.

I have noticed Aguilar .22lr ammo, ok as it is, tends to be sensitive to temperature. I will see whether CCI is better.

-TL

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[FrankenMauser]

CCI SV is pretty predictable.
It is temp sensitive, as far as losing velocity when cold and gaining when warm, but I wouldn't really classify it as "temperature sensitive".

I haven't noticed Aguila being very sensitive (beyond normal limits). I may have to test that. Though, we're running out of cold weather.

[tangolima]

Most of my handloads have 0.05%/degree F. MV varies by 1% for every 20 degree F temperature change. The limited samples on Aguila I have collected points to higher figures. I need more samples to be sure though.

-TL

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[stagpanther]

Get a very tight chamber that engraves the bullet when you chamber the round and the same exact lot of ammo will generally give better SD numbers.

Unless it blows up.