Modern Sporting Rifle Evolution
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RickAllen

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First post.

I'm relatively new to the AR world. Several years ago, I wanted a high power semi auto. All of my other rifles are either bolt or lever. I really didn't want a black rifle. Was leaning towards a Mini 14, but accuracy concerns and cost kept turning me back to the AR platform. 

The sheer number of available calibers is overwhelming.

I didn't want a 5.56. I consider anything under 6mm questionable for hunting. But, if SHTF, 5.56 is nice, so I built one. Standard M4-type fare with a 16" barrel. My plan was to build an upper in 6x45 with a much longer barrel, for more long range stuff.

I like 6mm. My most accurate rifle is a Remington 700 in .243. It's a 100 yard, 1 ragged hole gun if I do my part. But 6x45 has mag-length issues. I wanted to run bullets with higher BC, so I started looking at other calibers.

300 BO and 450 Legend almost had me. But the Blackout can be chambered in 5.56 with disastrous results, and 450 Legend doesn't use 5.56 brass (and I handload). The 7.62x40WT looked interesting, but there's an extra step in case formation.

To me, the genius in the 277 Wolverine is the slight case chop, which allows bullets with reasonable BC to fit the AR magazine. There was a 6mm AR wildcat that used a shortened case with a similar outcome, but it's not nearly as mainstream as the Wolverine, so here I am.

I bought one of Mark's 20" barrels a few months ago. I've built it as a prospective pig gun, to take the place of my 30-30 lever. To somewhat mimic the ballistics, I've chosen 130 grain Hornady bullets. I know they are a bit heavy for the caliber, if accuracy suffers I'll pick something else.

I've sized 50 cases, and am surprised how easy it is. For others thinking of this cartridge, sizing a .277 case with no lube is easier than full-length resizing a .243 case with lube.

I'm using AA2200 powder, and need the forum's help to keep me out of trouble. What do you suggest for a good starting charge and OAL?

Thanks in advance.


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RangerJoe

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Rick - as you already noted, 130gr bullets in the .277 Wolverine are a good bit heavy for it; while accuracy might be fine, MV is going to suffer.  As for OAL, you're going to want to load to the max that works reliable in your mags.  You will already be seating the bullet deep into the case, consuming internal volume.  I can't help you on load advice - 115gr is as heavy as I've tried, and found their performance suboptimal to my goals.

Forum members have exceptional results with bullets in the 90-110gr range on hogs.  Several of our folks are regular bacon-bangers using lighter weight-for-caliber .277 slugs.

Regardless, you'll find the .277 WLV an easy cartridge to make, load, and shoot well. Welcome aboard!

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Druidhillarmory

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+1 to what Ranger Joe said. The sweet spot for the Wolverine is 90-110. the 110 ProHunter from Sierra, Hornady V-Max and Barnes TTSX can be pushed over 2500 and the 95TTSX at 2700. I know many on this forum that slaughter Hogs with even the 90gr Speer Gold Dots. You can load the 130's and get good accuracy but in the end, if you're out beyond 100yrds, velocity, penetration and bullet drop are your enemies.
     I think the 110s are where you'll end up finding the most bang for your buck. That being said, Accubonds are also available in 100 and 110 grain that are sweet performers.
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RickAllen

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I looked at the 110 Accubonds. They typically are twice the cost of the Interlocks, and I plan to shoot a lot.

I'll run through these. If the results aren't satifactory, I'll look for an inexpensive 110 that has reasonable BC and shoots well out of the rifle.

Eye Candy...

IMG_4063.jpg 

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chackworth3

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Hornady V max and HPBT are both good 110gr options that are cheaper
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Druidhillarmory

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Speer makes a Gold Dot 115 grain for .25 a round and the Vmax 110 are around .25-.30 a round. Both good for coyotes. Sierra Pro-Hunter 110gr are awesome for deer and coyotes but they are hard to find.
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Cabob

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Please post your results. I have a bunch of them laying around that were intended for a friend's 270. He decided to go with 140s so the 130s were never loaded. I'd be curious as to the results from the Wolvy.
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Druidhillarmory

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According to the master load sheet on Google drive, Wikster posted this data.

Hornardy Interlock SST(27302) AA2200 @ 24 Grain using CCI 450 primers and LC10 brass. OAL 2.24. 2423fps 

This combination in a 24" Savage bolt action rifle resulting in slightly flattened primers. 

I would start with at Least 10% less and ladder up.


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RickAllen

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I plan on some preliminary testing this weekend. Might get some run across a chronograph next weekend. Hoping for 2400 fps and <1 MOA.
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wikster1983

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Reply with quote  #10 
Quote:
Originally Posted by Druidhillarmory
According to the master load sheet on Google drive, Wikster posted this data.

Hornardy Interlock SST(27302) AA2200 @ 24 Grain using CCI 450 primers and LC10 brass. OAL 2.24. 2423fps 

This combination in a 24" Savage bolt action rifle resulting in slightly flattened primers. 

I would start with at Least 10% less and ladder up.



Not sure how the sst was added, but they were flat base interlocks. Was a long time ago, but they were accurate enough to hunt with. SW blackout will do better for speed.

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Druidhillarmory

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Reply with quote  #11 
I was wondering but since it wasn’t my data, I didn’t want to change anything.
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RangerJoe

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Reply with quote  #12 
Quote:
Originally Posted by wikster1983
...SW blackout will do better for speed.
SWBO may be too fast for 130s, A2200 from original data sounds better. Comment subject to IV Pain Meds, YMMV. 🤪

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wikster1983

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Quote:
Originally Posted by RangerJoe
SWBO may be too fast for 130s, A2200 from original data sounds better. Comment subject to IV Pain Meds, YMMV. 🤪

There’s more data in my books than on data sheet. 2200 works good, but I do use SWBO for my 130’s now. It’s 24 grain (2200)for 24 grain (SWBO) about 200 fps faster. That being said, I only run 130’s in my 24” bull barrel savage; I use lighter in my gas guns. So please reduce and work up carefully.

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RickAllen

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I'll start at 22 grains and 2.240" and work up from there, unless anyone can talk me out of it.

I ran into a problem with my Lee rifle charging die. Minimum case length to trip the feed is a 5.56 case length. After chopping, the case is too short.

Will be charging by hand on the first few, until a short rifle charging die shows up.
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wikster1983

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Reply with quote  #15 
Should be ok. Never tested long with 2200, that’s right when SWBO came out- never looked back at it.
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RickAllen

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Reply with quote  #16 
First 4 rounds sent through the barrel today. 22 grains 2200, all different OAL. All locked the bolt back on an empty mag.

Longest OAL was 2.241". The bullet contacts the chamber at that length, so subsequent rounds will be 2.230" max.

No pressure signs, brass ejects about 4 o'clock.

Attached Images
jpeg IMG_20200308_154113.jpg (186.02 KB, 16 views)

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pikefish69

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Reply with quote  #17 
I use shooters world blackout over cci #41 in LC and federal cases out of a 16 1-10 twist barrel they are fine
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RickAllen

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Reply with quote  #18 
I ran a short ladder today. Used the time to get the scope in the ballpark, and check pressure signs.

No chrono data yet. I shoot half a mile west of my house (Nevada BLM) and we had significant rain over the weekend, 

Didn't want to haul too much equipment and a table out into the muck. Quite windy today too, and my bench rest (Bronco) was moving all over the place.

I'm using a Lee auto disk powder measure. It's not the ideal setup for AA2200, as the powder leaks a bit. also, getting consistent increasing steps in charge weight is impossible. The two 23.4 rounds below I loaded by hand because the next larger disk increment up from 23.2 grains actually threw less weight.

I did find a cut off 243 case makes a great funnel adapter. It just slips in the Wolverine neck.

IMG_20200314_204430.jpg 

LC brass, first firing after resizing. Case 1.535", OAL 2.230".
CCI 450
130 grain interlock

22.6 grains AA2200 4 rounds, no pressure signs (used these to get the scope close).
23.2 grains 5 rounds, no pressure signs.
23.4 grains 2 rounds, 1 had slightly flat primer.
23.7 grains 5 rounds, (slightly compressed). 2 had flat primers and 1 had a funky mark on the primer, origin unknown. The brass was collecting in the car ( I was sitting in the back with the tailgate open, using the swing-out tire rack for a rest), it might have struck a sharp edge somewhere in there.

flat.jpg 

Accuracy testing will have to wait for another day. I proved I could get within minute of pig, but it's not my best work. Targets at 50 yards. The wind had the crosshairs moving all over the place.

22.6.jpg 
23.2.jpg 
23.7.jpg 

I'll probably load up a few more at 23.2 grains using mixed headstamp brass and go back out next weekend.





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