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Known Loads too hot now..why

 
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  #1  
Old 04-23-2010, 04:11 PM
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Join Date: Aug 2008
Location: Anchorage, AK
Posts: 34
Known Loads too hot now..why

Please help! I've been reloading for about 2 years and I consider myself a careful reloader. Yesterday I had a very perplexing situation happen. Everything that I shot was too hot and I don't know why. Everything I have tested, chronographed and verfied several times. I just went out to shoot for groups yesterday. Here are my loads:

.300 SAUM
Model 7 22" barrel
200 Nos AB
61.6gr R-19
2.820 OAL
Chrono'd @ 2635fps

.300 Ultra
Model 700 26" barrel
180 Hornandy SST
99gr Retumbo
3.692 OAL
Chrono'd @3360fps

These loads were developed between temps of 20-40 degrees. Yesterday the weather was really nasty. It was 32 degrees and snowing heavily. (Yes I was out in it, you have to be to live in Alaska!)

Both loads showed giant shiny spots on the top of the brass and the bolt was hard to open. I shot a couple of each to be sure and got the same resuts. Then I picked up my 22-250 and some factory junk that I was getting rid of did the same thing!

I keep very thorough notes and I'm a careful reloader. I'm hesitant to tear these loads apart and start over.

My 2 hypothesis are:

1. My guns cooled very quickly in the weather. My ammo was on the bench but in boxes. Maybe it didn't cool as quickly, leaving a big difference in ammo v gun temp? Didn't feel like it but maybe...?

2. The blowing snow made the humidity 100% and combined 32 degrees made everything work weird...?

I don't want to question everything because I don't know where to start.
Any insight would be greatly appretiated.

Thanks
clhman
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  #2  
Old 04-23-2010, 08:08 PM
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Re: Known Loads too hot now..why

If you get water on the cases and/or in the chamber it will cause the rifle to act like pressures are high because the water lubes things and causes more bolt thrust.
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  #3  
Old 04-23-2010, 08:25 PM
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Re: Known Loads too hot now..why

Quote:
Originally Posted by Buffalobob View Post
If you get water on the cases and/or in the chamber it will cause the rifle to act like pressures are high because the water lubes things and causes more bolt thrust.
+1 Even if you kept your loads dry with the high humidity and the heat of firing,
rapid barrel cool you would get condensation, that sure accounts for the bolt swipe.
If this is the case your pressures were actually ok.
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Old 04-23-2010, 08:33 PM
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Re: Known Loads too hot now..why

Quote:
Originally Posted by Buffalobob View Post
If you get water on the cases and/or in the chamber it will cause the rifle to act like pressures are high because the water lubes things and causes more bolt thrust.
That is a good one!!!!! LMAO!!!!!!!!!
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Old 04-23-2010, 08:57 PM
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Join Date: Apr 2005
Location: Alaska
Posts: 3,344
Re: Known Loads too hot now..why

Quote:
Originally Posted by clhman View Post
Any insight would be greatly appretiated.

Thanks
clhman
You didn't state if these cartridges were loaded back at the time of original load development, or if you loaded them up at a different cartridge reloading event. Are you using the same powder scale, brand and model number primers, the same brass casings, the same Lot of gun powder? Do you have a weight to calibrate your powder scale with and have you checked it's accuracy?

Change any of these components and if you were already operating near max you could begin to experience excessive pressure signs.

"Both loads showed giant shiny spots on the top of the brass and the bolt was hard to open." What's a giant shiny spot on the top of the brass mean? Are you describing a relatively small (compared to the entire case head) shiny spot on the case head from a bolt face plunger hole or extractor slot?

Hard bolt lift is subjective also. I've had everything from noticable stiff bolt lift to having to slam the bolt handle up with the palm of my hand - or it wouldn't budge.

If you're experiencing a huge increase in pressures, I'd check the powder scale for calibration first, after confirming you haven't switched any of the other components or swapped over to a new Lot and container of powder.

Report back after you figure it out?
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  #6  
Old 04-23-2010, 09:35 PM
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Re: Known Loads too hot now..why

pull one round from each cal. and verify load if the same as data quoted on box reshoot loads to verify press need only shoot two rounds each
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  #7  
Old 04-23-2010, 09:43 PM
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Join Date: Aug 2008
Location: Anchorage, AK
Posts: 34
Re: Known Loads too hot now..why

Thanks for info. All components the same. I use a Lyman III digital powder thrower/scale, RCIV and RCBS dies. CCI 250 primers, powder and bullets same lot.

Come to think of it, everything was wet.

With the RUM pressure was seen at 99.5gr so I should be near the top.

With the SAUM I went all the way to 63gr with no signs of pressure, settled on 61.6gr because of a really good e.s.

Maybe I'll try them again now that the weather cleared up.
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