215 Berger Hybrid .300 Win Mag. Update

[BigBboy25]

Went out this afternoon and tested the 215 grain Berger Hybrid in my .300 Win. Mag. and thought I'd share my findings with you folks.

Rifle:
.300 Win. Mag. (SAMMI chamber)
Remington 700 BDL
Hart 28" 1-10" hunter bench rest contour
McMillian A-3
Jewell Trigger @ 1lb
20MOA Nesika Bases
Kelbly Heavy rings
DE muzzle brake
Tubb's Recoil lug
Leupold VX-III 6.5-20x40mm
Built by Truman Wilson

All groups are five shots and shot at 450 yards (measured w/ Bushnell 1500) prone off a Harris Bipod and rear sand bag. All the loads are using H4831 SC, Fed 215M primers, Remington brass, 215 Berger Hybrid and a COAL of 3.600". This OAL is the max length I can feed them through my magazine and with my throat it gives a jump of 0.060"- 0.065" THESE LOADS ARE HOT! START BELOW AND WORK UP!

71.0 grains
4.760"

71.5 grains
3.345"

72.0 grains
2.987"

72.5 grains (Pressure signs)
5.394

I loaded up more tonight, three different charges 71.5, 71.8, and 72.0 grains and will shoot them at 600 yards later this week. Hopefully this will reveal the "winner". My chronograph was on the fritz and giving me readings that were unreal (3600+ fps) so I do not have a true velocity but I am guessing they're around 2920-2950 fps. I wish I could get the bullets closer to the lands and grooves but I can't without making my rifle a single shot, and for my purposes I don't want that. I have another barrel on order from my gunsmith, same brand, contour and length but with a 1-9" and he's going to throat it as best he can for the 3.600" COAL with the 215 and 230 Berger Target Hybrids. I will upload pictures later tomorrow of the groups.

Hope you may find this useful.

 

[Tumbleweed]

Thanks for the post! A friend and I are also in the middle of load development for his factory Rem 700 300Win with a 26" barrel using the 215's. We are running H1000 and found 75.5 was our max running 2800fps. We were able to safely test higher and reached over 2900fps, but his barrel just could not burn the extra powder and produced pretty wild ES. The COAL with the bullet touching the rifling is 3.698" in his rifle. At .020" jump the cartridges will fit nicely in the magazine with no clearance issues. We discovered his rifle has a stock/barrel clearance issue so he is having the barrel channel opened and a professional bedding job done on it. It should be a real good shooter when we get it back.

 

[BigBboy25]

Glad you found this useful! Sorry I've not gotten pictures up, work this week has been extremely busy and I'm ready for dinner and bed when I get home.

I played with H1000 as well but after initial testing, it was evident that my rifle really liked the H4831 SC a lot better. I love H1000 and use it with my 210 VLD load but the 215's and 230's shot better with H4831 SC in my rifle. Not sure why but it shoots so I'm not complaining.

If you wouldn't mind sharing what you find with H1000 in your friends rifle I would really appreciate it!

Take care

 

[Tumbleweed]

Glad you found this useful! Sorry I've not gotten pictures up, work this week has been extremely busy and I'm ready for dinner and bed when I get home.

I played with H1000 as well but after initial testing, it was evident that my rifle really liked the H4831 SC a lot better. I love H1000 and use it with my 210 VLD load but the 215's and 230's shot better with H4831 SC in my rifle. Not sure why but it shoots so I'm not complaining.

If you wouldn't mind sharing what you find with H1000 in your friends rifle I would really appreciate it!

Take care

Big Boy: We got my friends rifle back a couple of weeks ago from getting a bed job and continued testing with the 215. We revisited a couple of H1000 combos that stood out previously. Groups shrank considerably with the stock work but after a lot of testing and even primer changes could not find the consistency or accuracy we were wanting with H1000. As I mentioned previously we could get over 2900fps safely but with wild ES. Hesitantly I bought a jug of H4831SC to try as we were wanting to stay with Hodgdon's extreme line of powders. Started at 70.0 grains and immediately saw much smaller ES numbers. Popped in some CCI250's and it was clear that the rifle loved the CCI's. I decided to move out to 740 yards, continue testing and increasing in .5 grain increments. I stopped at 73.0 grains which produced 2,867fps with 13fps ES and 6fps SD. Vertical dispersion was less than 2" at 740 yards and the group was around 1 MOA which for me is satisfactory in this stock, unmodified rifle running this velocity.

 

[BMF]

Thanks for the post! A friend and I are also in the middle of load development for his factory Rem 700 300Win with a 26" barrel using the 215's. We are running H1000 and found 75.5 was our max running 2800fps. We were able to safely test higher and reached over 2900fps, but his barrel just could not burn the extra powder and produced pretty wild ES. The COAL with the bullet touching the rifling is 3.698" in his rifle. At .020" jump the cartridges will fit nicely in the magazine with no clearance issues. We discovered his rifle has a stock/barrel clearance issue so he is having the barrel channel opened and a professional bedding job done on it. It should be a real good shooter when we get it back.

I also found similar results with this combo:

Trued and squared rem action
25" broughton barrel
Remington brass
CCI 250 primers
75.5 gr. of H-1000
2812 fps
7 fps E.S.

That load is over max, so obviously I worked it up, but I too see no sighns of pressure. Thinking of increasing my loads by .3 grain increments, to squeak out a little more velocity. Maybe I'm asking too much out of a 300
WM with a 25" barrel, but I'd like to get closer to 2850 fps.

BTW the above load produced a 3/4 in. group at 200yds. Needless to say I'm tickled!

 

[Lefty7mmstw]

Get a 300 ultra if you want over 2800 fps out of a 300 win with a 220 in a 26" barrel. I get 225's to 3000 fps with rl50 without breaking a sweat in the ultra. A 300win will be over pressure in a 26" tube over 2800 fps. I'm running 74.0 I 7828 in a browning 300 win with a 220 sierra and I'm squeaking out 2800fps with fed brass and 2750fps with win brass. rl25 is about the same speed with a few grains more powder.
es will grow a bunch when you hit the wall with a big pill in a rifle like this, so the poster that has trouble with es was probably getting told he was over pressure by his chrono.

 

[captainemil]

How far off the lands are you guys running on the 215's Just bought a Christensen arms 300 win mag and to the lands the is 3.940" , the box is not that big by a long shot

 

[Rick Richard]

I have shot several different calibers using Berger Hybrids and they all have around that 30 thousand off the land preference.

 

[BEEMAN]

Get a 300 ultra if you want over 2800 fps out of a 300 win with a 220 in a 26" barrel. I get 225's to 3000 fps with rl50 without breaking a sweat in the ultra. A 300win will be over pressure in a 26" tube over 2800 fps. I'm running 74.0 I 7828 in a browning 300 win with a 220 sierra and I'm squeaking out 2800fps with fed brass and 2750fps with win brass. rl25 is about the same speed with a few grains more powder.
es will grow a bunch when you hit the wall with a big pill in a rifle like this, so the poster that has trouble with es was probably getting told he was over pressure by his chrono.

If a 300 Win Mag is set up with the right reamer over 2800 fps without pressure is doable. Read Broz posts and he was above 3000 fps out of a 28" I believe. I got reamer advice from him when I built my 300 Win Mag. I get right at 3000 fps with the 215 out of a 26" Brux, as for lots of other guys. I'm no expert but my gun shows no pressure at this load. I'm sure it's close but it shoots great. Gun is full custom built on a Borden timberline. My friend used my reamer and gets identical results.

 

[ar10ar15man]

may i suggest you find some reloader 26..and then never look back.
in a long throated win mag i am at 2912 with a 230 berger
and a mere 26.5" bbl

 

[brentc]

How far off the lands are you guys running on the 215's Just bought a Christensen arms 300 win mag and to the lands the is 3.940" , the box is not that big by a long shot

This is surprising. I've never seen a CA 300 WM throat that long, and I've worked quite a few. My standard CA load comes in at ~3.645" OAL @ .020" off.

 

[ar10ar15man]

bore scope time maybe worn throat
a used rifle or set up for a diff bullet ?

 

[lancetkenyon]

6.5 year old thread.......

 

[ar10ar15man]

yes but an entirely new QUESTION WAS ASKED TODAY..

6.5 year old thread.......