Model 81 and 30 Rem handloads

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Mikeshoe72
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Model 81 and 30 Rem handloads

Post by Mikeshoe72 » Sat Sep 03, 2016 10:57 pm

I was chronographing my handloads in 30 Rem today and was shocked to see a five shot average of 2,495 fps! It's 31 grains of IMR 3031 and a 150 gr. Sierra round nose. I've been using this load for years, never knowing it was a bit warm. I'm gonna double check to make sure my chrony wasn't somehow to blame. Any thoughts?

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Hardrada55
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Re: Model 81 and 30 Rem handloads

Post by Hardrada55 » Sun Sep 04, 2016 6:55 am

You're at 2495fps with 31 grains of 3031. Something doesn't sound right. Quoting another cite, "Lyman Reloading Manual included data showing that the 150 grain Core-Lokt RN bullet (SD .226) could be driven to a MV of 2123 fps by 30.0 grains of IMR 3031 powder and a MV of 2364 fps by 33.0 grains of IMR 3031."
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Mikeshoe72
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Re: Model 81 and 30 Rem handloads

Post by Mikeshoe72 » Sun Sep 04, 2016 6:17 pm

I'm new to using a chronograph, and I may not have it far enough away. I had it at ten feet from muzzle, but I've read that the chrony really should be 15' to 20' out to avoid false readings.

Sebastian21
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Re: Model 81 and 30 Rem handloads

Post by Sebastian21 » Mon Sep 05, 2016 10:33 am

Most are set about 6 to 10 feet I have never seen one at 20 feet.

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Phyrbird
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Re: Model 81 and 30 Rem handloads

Post by Phyrbird » Mon Sep 05, 2016 11:29 am

Cross check it. An air rifle or pistol is a cheap way. If it consistently gives errors send it back for calibration.
This could be dangerous with faulty readings.
Another thought, I've heard of some of our ladies having smaller bores (.307-.306) than .308; this could cause increased pressures and velocity. Have you check the bore diameter?
Phyrbird
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