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lancetkenyon

.300RUM Upgrades

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Got a little sanding, and painting done on the stock this weekend. Sanded it way down, and I am trying a new paint. I really like the finish so far.

 

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Awesome! Let us know what paint. I have one to do, going to try urban camo blue, grey, black

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I have determined the .300RUM pushing 215 Berger HVLDs is WAY too much for coyotes......

 

@ 100 yards, there were coyote pieces 40+' behind him, 8' up in a tree, and a football sized exit. Strong quartering on, bullet entered behind front leg, exited.....everywhere.

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@ 300-310 yards, a little better. Baseball sized exit. Bullet entered a bit low, just behind front leg. Coyote ran 100 yards with no heart left inside the body cavity. Blood trail was impressive, and Ronnie Milsap could have followed it.

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I cant believe a coyote could take another step after having a 300 RUM anywhere near it, let alone through it.

That is why I thought I missed. 100 yard death dash in about 3 seconds.

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What a waste of meat!

Next one I shoot, I will drop it by your house. Let me know how it tastes.

I think ill pass , I watched a video on here of a big horn hunt and they showed the kid with the tag eating coyote testes and back straps. mmmmm goood..........for him.

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I finally got out this weekend to do a ladder test to start actual load development. Even though the rifle was shooting a 210 HVLD @ 2956fps tremendously, I wanted a bit more speed (why build a RUM if you are not going to hot rod it, right?). I want to state that the difference in the Berger book and the Hodgdon book starting and max charge weight is 2-3 grains lighter in the Berger book. So I started just below middle charge weights for my work up.

 

Conditions were as follows: 608 yards, 55°F, 27.07 baro, 2° uphill, light winds (2-5mph L to R from about 10:00), shooting due south.

 

Set up a target at 608 yards, and dialed up my original starting/sighting in load w. a 210 HVLD @ 2956fps to 2.8MIL to make sure I was on paper. It hit a touch higher than I wanted (about 3" high of POA on center of target & 1.5" right, due to wind), so I noted a change in dial to 2.7MIL (approximately 2" @ 600 yards) and proceeded to shoot my ladder test on that target, marking the target after each shot. Wind calcs showed a drift of about 1.5" to 4.5", but I just held center of target, as I was not worried about drift for my ladder test.

 

Across 12 shots of 1 round each with a change of charge weight of .5 grains between loads, I had a velocity change from 2960 to 3115fps. I had just a touch of sticky bolt lift on shot #12, but no signs on brass or primers that I noted, so I stopped there. Meaning shot #11 @ 3099 might be about max load for my rifle. Might be able to go up just a touch, maybe .2 grains, but that will be determined on my next round of testing of group size.

 

Seems like my node of choice to continue load development on will be #9/10/11 charge weights, with a total group size of .679" @ 600 yards. Velocities were 3055/3076/3099 fps respectively. See group at top right of target, right at the white border edge (6" high, 3.25" right). Shots 1/2/3 have a vertical dispersion of about 1" as well (with moving the first shot down 1/10th of a mil: 2"). Shot #3 (3.25" left of center) I tried to dial .2 mil left and the wind lulled, so I just went back to zero on windage. Stupid me to try and outguess Mother Nature.

 

600 yard ladder test w. 210 HVLD. (note shot #1 and take off about 2" in elevation).

 

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Next was the 215 Hybrid ladder test. I started these out just a bit hotter (1.5 grains) than the mild HVLD starting load, as I already knew how light of a charge weight it was at my starting charge weight, yet still well under book max. I dialed down .1MIL from the HVLD hold to 2.6MIL to try and keep the shots in the black, hoping the change to an unknown bullet would not effect POI too much, and let the starting load rip. Winds were fluctuating from calm to slight breeze L to R, with an occasional change in direction by now. I was really trying to play the wind and feel the lulls for holds at first.

 

Shots 1 through 4 have a vertical dispersion of about 1.25" @ 2975 to 3031fps. Shots 7/8/9/10 (top right again) have vertical dispersion of about 1.5" at velocities from 3070 to 3115fps. Not terrible, and gives me a good starting point to continue load development. I possibly had a touch of sticky bolt lift on shot 10, so I stopped there. No pressure signs noted on brass though. No flattened, extruded, crated or pierced primers, no soot ring around primer, no extractor marks or case head swipes, etc.

 

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Lastly, I broke out my 6.5 SLR to shoot a couple groups with various loads I have worked up. Four 3 shot groups @ 608 yards. Man I love this rifle. I hope the .300 RUM ends up this good.

 

Group #1 is my light target load w. a 140 Berger HVLD @ 2815fps. 1.1" .183 MOA

Group #2 is my hunting load w. a 140 Berger HVLD @ 2925fps. 1.5" .25 MOA

Group #3 is a load of 142 SMKs using out of spec cases that did not make the cut when weight sorting brass @ 2910fps. 2.2" .366 MOA

Group #4 is a 140 Hybrid at my hunting load charge weight @ 2931fps. 1.7" .283 MOA

 

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Great thread Lance. How many rounds down the pipe? I imagine you'll pick up some more speed as it breaks in. I love those 215's.

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