350 B.O.R. Lock ???

[JeffB1961]

another possibly dumb question from someone (me) who's still trying to figure out their butt from a hole in the ground concerning ML's ........

if , IF ! ..... if i ever get a chance at a elk in Va. is the 350 BOR Lock plenty adequate under 150 maybe 200 yards with say 100 grains of 777 fffg pushing it ...... IF i do my part putting it in the right area ? or is a 250 monoflex or TEZ enough for elk at those ranges ? i know the mono and TEZ are plenty for deer , i ordered some last week (mono's and TEZ's) and they are supposed to be out for delivery (along with my case) . but just want to be sure about elk and the BOR Locks .

thanks , Jeff

 

[HC]

My suggestion would be a Barnes 290 tez with a maximum load of powder. Then practice out to 200 yds.

 

[txhunter58]

I am leaving in a couple of weeks to hunt elk in Colorado. Will be using the 350 BOR lock and 95 gr of BH 209. Pretty comparable to your load. I feel very comfortable out to 150 yards which is my limit for open sights. If I ever hunted where I could use scopes and sabots I might very well is the 290 gr tez. Should be able to stretch things out to 250 with that.

My brother is using a 350 gr Hornady FPB bullet (discontinued) and 90 gr of BH 209. It is also a lead alloy bullet. Also fee very comfortable out to 150 yds with his load. He and I have killed 5 elk with that bullet with the longest shot being 150 yds.

My minimum for elk with copper is 290. With lead is 350.

Know a guy who killed an elk at 265 yards in Colorado (open sights) with 90 gr of pyrodex P and a 460 gr No Excuse conical. Big slow bullets kill!

 

[txhunter58]

My brother shot his last elk, a big cow, at 100 yards with that load. Under the hide on the far side and still weighed just over 300 gr.

290 tez prob would have punched thru but I love the performance of the FPB bullet. Cow went 80 yards. Lead BOR bullet is constructed pretty similar

 

[ElDiablo]

My minimum for elk with copper is 290. With lead is 350.

I agree. I’ve killed a pile of elk with a muzzy and this would be my advice. Bigger is better.

 

[txhunter58]

Also reread HCs post and note that he says “max charge”. To extend the range on copper bullets you have to have enough velocity to get them to open. So 100 gr may be enough to stretch it to 175-200 yards, but beyond that you prob need to increase your powder load.

Another thing to consider.

100 gr of 777 pellets = 100 gr blackpowder

100 gr of 777 loose powder = 110-115 gr blackpowder.

All measurements are volume

Loose is cheaper, easier to tweak, and is more powerful.

 

[ElDiablo]

Did a little measuring and weighing of the 350 gr BOR Locks recently. They are certainly a unique design.

The bullets I weighed ranged from 349.8 gr to 351.2 gr, with an average of 350.62 gr.

Lead Bullet 333.4 gr
Polymer cup 14.6 gr
Polymer tip 4 gr

Out of the package, the polymer cup and largest diameter of the lead is about .498” so they slip down my TC barrel quite easily. The fiber base of the cup is .503” so it provides some interference (designed to scrape fouling).

Interestingly, with about 50 lbs of seating pressure, the cup obturates on the bullet (as designed) and swells the cup to .500”+ (in one test while not in the bore it measured .518”). So it appears that if you seat these with firm pressure you are pre-obturating the cup.

I cut one of the cups and photographed it to see the design.

Looking forward to shooting more of these.

 

[ElDiablo]

A few more data points on the 350 BOR Locks.

I shot a couple past the Magnetospeed this morning to get an idea on the velocity.

TC Omega .50 Z5 (28” barrel)
Fed209A (w o-ring)
350 BOR Lock
3000’, 85 degrees

90 grV BH209 1775 fps
95 grV BH209 1784 fps
100 grV BH209 1867 fps

 

[JeffB1961]

hmmmm .....
90 grains 1775 fps
+ 5 grains adds 9 fps
+5 more grains adds 83 more fps

interesting .

 

[ElDiablo]

hmmmm .....
90 grains 1775 fps
+ 5 grains adds 9 fps
+5 more grains adds 83 more fps

interesting .

Yeah I’m not sure what to make of that. Those numbers are one shot over the chrony. So it might turn out a little different if you averaged a bunch. But it could be that that 100 grain load bumps it (obturates) faster and it loses less to initial blow by. Would be interesting to see what a wad would do.