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Universal Clays - How Temp Sensitive?


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I did some chronoing today. Unfortunately it was a 100+ degrees out. I got:

124 FMJ Precision Delta

4.4 Universal Clays, 1.160" COAL, FSP, Mixed Cases = 1066 fps (5 shot avg) => 132 PF

4.7 Universal Clays, 1.160" COAL, FSP, Mixed Cases = 1126 fps (5 shot avg) => 139 PF

(4.9 is book max)

Shot from a relatively new G34.

Does 4.4 sound right?

I have 2000 bullets ready to be loaded and I'm hesitant to use 4.4 grains because it was a 100+ degrees.

This is my first 8lb jug of UC and I don't know how temp sensitive it is. Is it positive or negative temp sensitive?

I need to make minor PF (these loads will be for Production). If I shoot the 4.4 UC load at say 60-80 degrees will I still make minor?

Thanks.

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My standard 124gr load is between 4.3 and 4.4gr Universal Clays, a little shorter OAL, PD or MG bullets, and for the round nose, does about the same velocity from a G17 as you got. I haven't noticed temp sensitivity...but I haven't specifically tested for it. For MG JHP, I load even shorter, and get around 1120fps.

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