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300 RUM with 210 BERGERS

 
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  #8  
Old 09-26-2010, 05:24 PM
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Join Date: May 2007
Posts: 87
Re: 300 RUM with 210 BERGERS

Thanks for the input, guys. I'll surely consider your suggestions, but first I'm going to try to see how repeatable that .175 group is with 94 grains. If it continues to shoot 4/10ths or less, I think I'm in Nirvana. No need to wear out a barrel looking for the Holy Graile. Once again, thanks for the input. I don't think it makes a lot of difference, but I forgot my target backer yesterday and set the target up on the berm, so these groups were shot at 110 yards instead of 100.
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  #9  
Old 09-26-2010, 06:11 PM
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Re: 300 RUM with 210 BERGERS

Just an fyi, my 300RUM load with 210's and Retumbo (factory 26" barrel) is 94.7g at just under 3K acc'd to exbal using Litz's bc numbers, but about 3020fps with my chrono. It is very consistent.

Edit: Got called away and couldn't finish this post...

-.010 and ~3.845 OAL and FED 215M. Interesting that your 94g load grouped best and that's close to where I am. Might be a sweet spot with the RUM and 210's.

That ES is quite odd. What are your reloading techniques--close to or essentially benchrest techniques I'm guessing?


JMDEN,
I'VE BEEN SHOOTING NBRSA SHORT RANGE BENCHREST MATCHES FOR 10 YEARS OR SO, SO I IMAGINE A LOT OF THAT BLEEDS OVER INTO ALL MY RELOADING. BUT WITH THE RUM, I BOUGHT REMINGTON BRASS, WEIGHED AND SORTED THE 100 CASES I BOUGHT INTO ROUGHLY TWO GROUPS AND CHAMFERED THE CASE MOUTHS, SLID A BULLET IN PLACE, MEASURED THE LOADED CASE NECK WITH A VERNIER CALIPER. I WAS REALLY SURPRISED TO FIND THAT THE CASE NECK THICKNESS VARIED LESS THAN A THOUSANDTH ALL THE WAY AROUND THE NECK ON THE CASES I CHECKED. I SPENT MORE TIME FUSSING WITH WHERE TO START WITH THE BULLET SEATING DEPTH THAN ANYTHING. I FINALLY SET THE BERGERS AT ABOUT .010 INTO THE LANDS AND LOADED THE CASES USING AN RCBS CHARGEMASTER.

I LET THE BARREL COOL WITH A WET TOWEL ON IT BETWEEN EACH GROUP FOR 5 TO 10 MINUTES BEFORE SHOOTING THE NEXT ONE.

I WAS SURPRISED AS ANYONE WHEN THE 92, 93 AND 94 GRAIN GROUPS COULD ALL BE PUT ON TOP OF EACH OTHER AND MEASURED LESS THAN 1/2 INCH. THE GROUPS ALL FORMED AT THE SAME STOP ON THE TARGET AND RESEMBLED EACH OTHER VERY MUCH IN SHAPE EXCEPT THE .175 GROUP LOOKED LIKE A 3-LEAF CLOVER WHERE THE OTHER TWO GROUPS HAD TWO BULLETS TOUCHING AND THEN ONE JUST A LITTLE OUT OF THE GROUP.

I'M GOING TO TRY THE 94-GRAIN LOAD AT 500 YARDS SOMETIME SOON AND SEE IF THE VERTICAL IS GOOD OR NOT.
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  #10  
Old 10-10-2010, 02:59 PM
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Re: 300 RUM with 210 BERGERS

Hey, guys, I'm done. I went to the 500-yard range today and shot my 300 RUM with the 94 grain Retumbo load, 210 Berger and Winchester Large Rifle Magnum Primers. It was about 20 degrees hotter here today at about 11:30 a.m. CDST, about 85 to 87 degrees.

I set up my 35P Oehler, got my gun sighted in on some clays at 500 yards and shot one three shot group over the chrono. It averaged 3,175 FPS with a 5 FPS ES and 2 FPS SD. THe wind was in my face, about 10 MPH straight on. The group measured 1.963 inches. The biggest change to my load was the Winchester primer, and I took off a 3.5x15x56 NXS and put on an 8x32x56 NXS, which made holding on the target much more consistent.

I appreciate everyone's input. It all helped me get to my goal of 2 inches or less at 500 yards. I now feel like I can take 600 to 800 yard shots on deer with confidence and feel like I've put in enough work to legitimately take such a shot.

Gary Morgan
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