.300 Win Mag and 215 Hybrid OAL

[johnc427]

Slowly putting together a custom .300 Win Mag for elk hunting. Remington 700 Action, Brux 1:9 twist barrel, wyatts extended box mag, etc. Would like to run Berger 215 hybrids...

Anyone have any suggestion on an COAL to make a dummy round for my smith? Talked to Broz on here and he suggested 3.740" COAL. Any input would be appreciated, thanks!

 

[Alaska2006]

My 300 26" 1:10 5R Brux screwed to a Defiance action is 2.885 base to ogive and 3.640 COAL with .035 jump. She eats 215 Berger hybrids like candy. Consistent 5 shot groups <.360 at 100 yards and a hair over 3,000 fps over my lab radar. That is at 5,000' elevation and burning H1000, Norma brass and Fed 215s. It's a little tough on brass at this load. I get about 5-6 reloads with Norm and only 3-4 loads with Nosler, Hornady & Federal 2-3 reloads at best.
I have two of these almost identical in build spec both shot nearly the same. The Brux is about 35 fps faster them my Krieger 3 groove with the same load but both shoot bug holes.

 

[dmj]

My 300 win mag has been running the 215 with h1000 powder. Ogive of 3.843 and .040 off the lands. My measurments were taken using hornady tools. Have only been running 71.5 gr. of the h1000, doesn't get me a lot of speed (2675 out of a 25 inch bench mark barrel) but it seems to give me some pretty good sub half inch groups.

 

[dmj]

Should have added barrel twist. 1:10

 

[FURMAN]

I used the reamer Broz posted on Longrangeonly. My oal is 3.710 and the ogive is at 2.933 measured with Stoney Point gauges(Hornady lock n load). If I were you I would go with what Broz suggested. My last 300 was chambered with a SAAMI reamer and shot awesome but only got 2890fps. I am still in the middle of load development on the new one but it looks like accuracy is probably at least 50fps higher.

 

[brentc]

I had Northwest Action Works put a barreled action together for me using a custom stepped chamber reamer developed for the 215. The OAL is 2.810" Base to ogive with a 215 seated .050" off. This load in in my 26" barreled rifle printed .1 MOA groups to finalize load development. These rounds easily fit and feed from a standard Rem 700 magazine with room to spare.