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300 RUM and VLD's velocity ?

 
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  #1  
Old 09-16-2011, 02:28 PM
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300 RUM and VLD's velocity ?

o.k. I have shot 180 grain accubonds out of this gun for quite awhile but have never been very impressed by the accuracy. I recently switched to 185 grain Berger hunting VLD's and I am using 88 grains of RL-25 I am getting pretty good groups. the problem is My chrony is telling me my loads are only going 3060 FPS. I am dissapointed in this speed as my old loads were going 3283 and I know of others getting over 3400 FPS. Is my Chronograph broken or is this a normal velocity for a load like this anybody that shoots a comparable load let me know what you are getting.
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Old 09-16-2011, 04:08 PM
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Re: 300 RUM and VLD's velocity ?

It is not surprising that your load is going that slow. I think you have some case capacity to get some more powder in there.

Also, one should not put much credence into 'internet velocities'. My 300RUM shoots the 208/210 grain bullets about 3150fps with 91grains of Retumbo. If I believed what was on the internet, I should have been able to push them at 3300+

If you want to shoot the 185grain bullets (and I would recommend you shoot an even heavier bullet), you should consider changing to Retumbo and more than 88 grains of it.
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Old 09-16-2011, 04:51 PM
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Re: 300 RUM and VLD's velocity ?

Agreed with above, 88 gr is light and not near max from the load data I have had. Also, I am in AZ and have shot mine when it was 118 out. If I can't get to a velocity that someone posted at that temperature then their chrony is broke, they are full of it, or their barrel is at least a couple inches longer than mine.

I will tell you I just switched over to H1000 in both the 300 RUM and a 7mm Dakota and my ES across the board is much better and the velocities are not much different. It seems at least in hotter weather the H1000 is a bit more stable. Of course this is only one variable I did not test different primers or in cooler weather.

I am shooting the 190's in the RUM and 180's in the 7mm. I agree with trebarks recommendation the RUM' seems to like heavier bullets, I have shot mine all the way down to 150's and while okay I got more of the occasional random flier with the light stuff.
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Old 09-16-2011, 11:51 PM
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Re: 300 RUM and VLD's velocity ?

yeah I started out with load data from berger and their max load was 89 grains. I am now learning that this is very conservative I think I am going to work up some 93, 94, 95's in that area. it almost seems like people are getting better accuracy with these bullets pushing them harder.
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Old 09-17-2011, 12:15 AM
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Re: 300 RUM and VLD's velocity ?

I don't see that being a problem the Retumbo can says 100.5 max load for a 180 gr bullet. I was in the area you are describing with the 190's. Just work up one grain at a time and keep watching for pressure signs.

I am pretty sure you will get back to the old load speeds you are looking for.
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Old 09-17-2011, 12:48 AM
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Re: 300 RUM and VLD's velocity ?

Quote:
Originally Posted by justin300mag View Post
yeah I started out with load data from berger and their max load was 89 grains. I am now learning that this is very conservative I think I am going to work up some 93, 94, 95's in that area. it almost seems like people are getting better accuracy with these bullets pushing them harder.
My experience with the VLD's has been similar, they have been the most accurate for me when pushed pretty hard at or near max load. This has been in different rifles as well. My 27" barreled 300RUM pushes 210VLD's to 3110 with 89.5 grains of H1000 touching rifling with low ES and .375 to .5 MOA accuracy.
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Old 09-17-2011, 01:05 AM
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Re: 300 RUM and VLD's velocity ?

In preliminary testing of the 180 grain cutting edge bullet .6 BC I have shot it to over 3500 fps with no pressure signs. This is out of a 28" barrel 300 RUM. This makes 1000 yard kills on any big game fun. Retumbo worked well.
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