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Offline rdlange

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RL7 question
« on: May 14, 2012, 03:20:41 PM »
Down here in TX it gets really hot.  How heat sensitive is RL7 to the heat?
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Online Lloyd Smale

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Re: RL7 question
« Reply #1 on: May 15, 2012, 01:44:30 AM »
never noticed any problems but then i live in michigan.
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Offline Larry L

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Re: RL7 question
« Reply #2 on: May 15, 2012, 02:58:29 AM »
I use it only in the 375 Winchester. It gives me the most velocity with the 220 gr bullets. From our typical cool winter days to the heat of South Texas, it can change the velocity by 150'ps from coldest to hottest. Doesn't seem to effect accuracy or POI thought in this particular cartridge. I didn't see what cartridge yer loading for but if the heat is a factor, might to look to TAC, if it'll work for you. My next round of powder buying will include TAC for a lot of my loading. It's cheaper, clean burning, and extremely temperature stable.
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Offline res45

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Re: RL7 question
« Reply #3 on: May 15, 2012, 10:48:10 AM »
I've been shooting RL7 for around ten years now in my SKS rifles as well as using it for cast rifle bullet loads.  Down here in the south it gets pretty hot and muggy during the summer months probably not as hot as Texas though.

I've never really notices any difference regardless of temps in my POI at the ranges I shoot at or any pressure issues.  I also don't shoot Max. loads with that powder so I'm sure that compensates somewhat if any pressure issues that might arise from ambient temps.

I really need to do some chrono test at some extreme temp ranges to see how much difference it makes with a given load just to have some number to look at.
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Offline tacklebury

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Re: RL7 question
« Reply #4 on: May 15, 2012, 11:41:13 AM »
Quote from: Lloyd Smale on May 15, 2012, 01:44:30 AM
never noticed any problems but then i live in michigan.

+1 - Another Michigan resident, so probably not as hot as there.  I have shot on a few 87+ days with the hottest being about 93 with no noticable effect.  And I've shot it in -20 degrees F with no issue.  ;)
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Offline frgerald

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Re: RL7 question
« Reply #5 on: May 16, 2012, 08:24:24 AM »
Last summer a friend and I were hunting hogs on his ranch in Stephens Co. (Breckenridge area) in Texas.  We went inside because it was 103 outside.  I had this brilliant idea that those hogs were as hot as we would be and would probably be laying around in what water was left in the stock tanks.  Sure enough we got a big'un (250#).  My load was a 38-55 using 30 gr. RL-7 with the Hornady 220 FP.   RL-7 is all I use in my .375 bore 38-55 on a Marlin 336 re-chambered from 30-30.  It has never given me a problem, hot or cold!   8)
Gerald
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