Testing new Long Range rifle.

[farmerj]

Can I get some extra popcorn on my butter

[RAGGED]

My final thoughts on this matter. As I stated above, I have no dog in this purse fight, I was merely pointing out BC numbers which seemed much higher than they could realistically be. If these .277 caliber 120gr bullets have a 40gr tungsten tip added to them I can see how the BC number could be higher. Now, .695 might still be a bit optimistic, but it is close enough to a fair fudge factor to not bring up.

Except he clearly posted the weight as 120....

AND HERE IS MY RIFLE....

So what is it, 120 or?........

[crbutler]

Begging indulgence for my ignorance, but isn't a "300 weatherby necked down to .270" just a .270 weatherby mag?

Why reinvent the wheel?

[RAGGED]

Begging indulgence for my ignorance, but isn't a "300 weatherby necked down to .270" just a .270 weatherby mag?

Why reinvent the wheel?

300 wby and 30-378wby are different animals, the later being bigger

[crbutler]

yes, but he said that the parent case was a 300 wby, not a 378 Wby.

[LongRange]

the 7mm WBY, 270 WBY and 257 WBY all share the same parent case, the 300WBY is larger so no, it isnt the same thing.

[RAGGED]

So does your .695 bullet weigh 120gr total or is it larger?



Food for thought, below is a few 3D models I thru together, the two on the left are .277 cal projectiles and have around .035-.04 cubic inch volumes which is being MORE than generous as 120gr of pure tungsten is only .024 cubic inches. Now you can take the density of copper, tungsten and lead and extrapolate from there but this gets us very close to a 120-150gr pill, as you can see with the 277 diameter there is just not allot of room to stretch a bullet out and make it a more efficient shape. To contrast I put a .243 cal 115 gr DTAC next to it, this bullet has a confirmed BC in the high .5 range, .55-.585, this is the bullet David Tubbs makes and uses to win national championships again and again. I also put in a .338 cal 300 gr SMK, this has a .750-.768 BC. Just a simple look will tell you right away that there is something wrong with this .695 claim

[crbutler]

the 7mm WBY, 270 WBY and 257 WBY all share the same parent case, the 300WBY is larger so no, it isnt the same thing.

The base case for all of these is the .300 H&H Magnum.

Now that you said this, I went and looked it up. There is a little difference in case length, but they all have the same parent. I have a buddy who occasionally would make .270 Wby Mag rounds out of once fired 300 Wby, so that was why I asked.

[LongRange]

the 7mm WBY, 270 WBY and 257 WBY all share the same parent case, the 300WBY is larger so no, it isnt the same thing.

The base case for all of these is the .300 H&H Magnum.

Now that you said this, I went and looked it up. There is a little difference in case length, but they all have the same parent. I have a buddy who occasionally would make .270 Wby Mag rounds out of once fired 300 Wby, so that was why I asked.

Not sure why he would do that.. the difference is quite alot in terms of resizing the shoulder....

[LongRange]

Lost River J36 135gr B.C .7351 @3000 fps
Matrix VLD 165gr B.C .7381 @2800 fps
Matrix VLD 175gr B.C .7828 @2700fps

Not sure why it is hard to understand a solid round 120-140 gr @4000 fps having a B.C of .7 area.. these are examples that DO exists and I have fired. The Matrix rounds I have found to be very satisfactory in accuracy. The LR's as well but a barrel length of over 30" and trist rate of 11 is needed. Hope this helps, If not then I guess theres no hope.

[farmerj]

Lost River J36 135gr B.C .7351 @3000 fps
Matrix VLD 165gr B.C .7381 @2800 fps
Matrix VLD 175gr B.C .7828 @2700fps

Not sure why it is hard to understand a solid round 120-140 gr @4000 fps having a B.C of .7 area.. these are examples that DO exists and I have fired. The Matrix rounds I have found to be very satisfactory in accuracy. The LR's as well but a barrel length of over 30" and trist rate of 11 is needed. Hope this helps, If not then I guess theres no hope.

135 gr is still a LONG ways from 120 gr.

just sayin'.

[LongRange]

and .695 is a long way from .738 and 3000fps is a long way from 4000fps

[RAGGED]

Lost River J36 135gr B.C .7351 @3000 fps
Matrix VLD 165gr B.C .7381 @2800 fps
Matrix VLD 175gr B.C .7828 @2700fps

Not sure why it is hard to understand a solid round 120-140 gr @4000 fps having a B.C of .7 area.. these are examples that DO exists and I have fired. The Matrix rounds I have found to be very satisfactory in accuracy. The LR's as well but a barrel length of over 30" and trist rate of 11 is needed. Hope this helps, If not then I guess theres no hope.

When did the J36 .277 jump from a .649 all the way up to .7351? That’s a pretty big jump and considering you are now playing the variable BC/velocity game your numbers should reflect that, your bullet is not hitting 4000 fps forever so stop using static numbers like you are when you clearly understand the relation between speed and BC. Need I remind you playing fast and loose with the numbers and facts does not help your crazy claims.

Also like farmer said 135, 165 and 175 are a ways from 120 that you clearly stated was your weight, you're 4200 FPS was based on that 120 weight, going up in weight will certainly bring that speed back down. Also you said your round has some tungsten, which means you won't get near the length out of a bullet that you would with a solid lathe turned brass round like the Lost River, look at my CAD, its doesn't lie. Consider the profile on the 115 6mm DTAC next to the 277 pills in the CAD, considering its much larger in diameter its not feasible that it will get long enough while maintaining acceptable bearing surface. How long is the tung tip? If its very short than maybe you will approach the LR pill but considering the dense material in the tip and lesser weight its going to be very hard to match that shape and BC.

PS Everything I've EVER seen says the lost rivers 135's need 1-10 twist min, so how are you going to fire these ultra long pills with your 1-11?

Just give it up already, its a screamer, we get it, but stop trying to prop it up, your 120 pill does not have a .695 BC, you have no proof, no explanation how you came up with that number, hell you wont even post a pic of this magic bullet and its doubtful you even have the right bbl twist to shoot the imaginary bullet.

I understand you came on our little old local forum thinking there wasn’t anyone on here that would be able to spot some hard core BS but you clearly you thought wrong as there are more than a few guys here that know what they are doing. I would urge you to start a similar thread on Accurateshooter.com, (I may go ahead and start it for you) I’d love to see what Bryan Litz would have to say about your claims.

Again I’m trying to nail down the facts so please answer this question, are you still maintaining you have a 120gr .277 bullet with a .695 BC?

[LongRange]

yes.

[EJSG19]

yes.

Well. That clears that up then...