NOE 311-158- GC

Spindrift

Active Member
During the latest dicount at NOE, I ordered a 5-cavity 311-158-gc mould. After cleaning, and a couple of heat cycles, I started casting with it. It actually took a couple of casting sessions before it started making good bullets, but today it came around.

A 5-cav might not be the best choice if you are looking for ultimate uniformity. But it certainly is effective!
In my alloy, the bullets are .312 on the driving bands. The nose, just north of the front band, tapers from .308, just as it should.

Looking forward to shooting this bullet. I’m no expert in bullet design, but my gut feeling is, this will work in a lot of chambers.

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Ian

Well-Known Member
I have that one and it fits a grand total of ZERO of my .30-caliber rifles, including my extremely worn Marlin 336. Wish I'd known you wanted one, I could have shipped it to you. The problem is that part of the nose that reads .301" actually casts .3035" on mine, with straight WW alloy run hot to minimize diameter. Might be good for an AK or SKS with a really sloppy throat.
 

Spindrift

Active Member
Ooops, maybe not my best decision.
Sized a bullet .310 with GC, and measured COL with light jam fit in my Rössler titan alpha .30-06. It felt «right» when I pushed the bullet into the lands. 4 nice, symmetrial scuff marks from the lands. With my limited understanding of bullet fit, this doesn’t look to bad?
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Ian

Well-Known Member
That looks perfect to me, your mould must be cut more to the drawing size than mine. What does the nose measure?
 

Spindrift

Active Member
It is a bit hard to measure the nose dimension, since it tapers. Halfway along the scuffmarks (approximately), I get .304.

Edit: the part of the nose, where the drawing says .301..... I measure .301.
 
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Ian

Well-Known Member
Wow, NOE cut a nose to the drawing.....I guess there's a first time for everything, LOL! What you have there with the tapers matching up well, plenty of room for lead to displace (crimp and lube grooves), gas check in the neck, and a decent amount of bullet lube capacity should all add up to a really accurate combination with that rifle. You got the static fit, now it's all about dynamic fit (distance to lands, alloy constitution, neck tension, powder mass/burn rate, primer brisance) and tuning the load to the barrel harmonics.

You might even find the rifle likes .311" better than .310", depending on the entrance diameter. Many '06 throat entrances are small at .3105" or less, but some are .312"+.
 

Spindrift

Active Member
This is a switch-barrel, and the -06 barrel has actually had a rather long sabbatical, while I have focused on the 6,5x55, and .223. Earlier, I have used .311, which has worked well. The .310 sizing option is still a bit new to me, and I am testing wether all my .30- cal rifles might like .310. It would certainly simplify things.
I will certainly try .311, and maybe even .312. Thanks for the feedback!
 

Spindrift

Active Member
Shot a few groups with this bullet today. Only two 5-shot groups each, in .30-06 and .308. Using vectan tu-3000, as I am focusing a bit on this powder these days. The .30-06 groups (27-28grs) where OK, but not sensational- absolutely potential there. 1,5MOA, approximately. The .308 (26-27grs) shot a little better, around 1,3 MOA. Which is, for me, a good start. As usual, shot at 100m from prone position with support on a bag (a little shooters error in the equation, I’m afraid).

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popper

Well-Known Member
That is a pretty light load. 36-42 normal. Normally I size 310 in 308W, hard alloy (WW or harder) which works good in my ar10. Surprised by the 300BO, 145gr GC 50/50 with some (kinda lite load but seated deep) Rx7. Sized 308!! Usually 3085 or 309. Inclined to think oversizing is for increasing start resistance so powder builds up pressure.
 

Spindrift

Active Member
Yes, it is a pretty light load, my guess is about 1800fps. The powder works really well in this load level, burns clean. I will try to increase the load gradually, and some other sizings as well.